QSC ISA SERVICE MANUAL

ISA™ Series

▲▲

▲ ISA280

▲▲

▲ ISA300T

▲▲

▲ ISA300Ti

▲▲

▲ ISA450

▲▲

▲ ISA500T

▲▲

▲ ISA500Ti

▲▲

▲ ISA750

▲▲

▲ ISA800T

▲▲

▲ ISA800Ti

▲▲

▲ ISA1350

▲▲

QSC Audio Products, Inc.

RoHS

Costa Mesa, CA 92626 USA

www.qscaudio.com

Technical Service Manual

*TD-000163-00*

TD-000163-00

Rev. A

Technical Service Manual

ISA280

ISA450

ISA750

ISA1350

ISA300T & ISA300Ti

ISA500T & ISA500Ti

ISA Series

ISA800T & ISA800Ti

QSC Audio Products, Inc.

Technical Services Group

Phone: 1-800 QSC AUDIO (1-800-772-2834) USA only

+1 (714) 957-7150 Fax: +1 (714) 754-6173 Postal: 1665 MacArthur Blvd.

Costa Mesa, California 92626 USA E-mail: tech_support@qscaudio.com Web: http://www.qscaudio.com (product information and support)

http://www.qscstore.com (parts and accessory sales)

Technical Service Manual 1 ISA Series Power Amplifiers

ISA amplifier, rear view

2 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Table of Contents

ISA Series Performance Specifications ................................................................................................................................ 5

1. Introduction...............................................................................................................................................................................7

1.1 Restriction of Hazardous Substances Directive (RoHS) .......................................................................................................................... 7

1.2 Service bulletins ................................................................................................................................................................................................... 7

1.3 The well-equipped service bench ................................................................................................................................................................. 7

1.4 Working with surface-mount components .................................................................................................................................................. 8

Two-terminal components (resistors, capacitors, diodes, etc.) ........................................................................................................................................................................ 8

Three-terminal components (transistors, etc.) ................................................................................................................................................................................................. 8

Multi-pin components (ICs, etc.) ...................................................................................................................................................................................................................... 9

1.5 Series description .............................................................................................................................................................................................. 10

Outputs for distributed lines .......................................................................................................................................................................................................................... 10

1.6 Technical descriptions and theory of operation ..................................................................................................................................... 10

Power supplies .............................................................................................................................................................................................................................................. 10

Audio circuitry ................................................................................................................................................................................................................................................10

Clip detection ................................................................................................................................................................................................................................................ 11

DC protection ................................................................................................................................................................................................................................................ 11

Class H ........................................................................................................................................................................................................................................................... 12

Bridged mono operation and protection ....................................................................................................................................................................................................... 12

Output transformers and autoformers ..........................................................................................................................................................................................................12

1.7 ISA1350 circuitry ................................................................................................................................................................................................. 13

Class H step drivers ....................................................................................................................................................................................................................................... 13

Bias circuitry .................................................................................................................................................................................................................................................. 13

Muting via the bias network ......................................................................................................................................................................................................................... 13

DC fault protection ........................................................................................................................................................................................................................................ 14

1.8 Revisions made during production ............................................................................................................................................................... 14

ISA750 and ISA800T ..................................................................................................................................................................................................................................... 14

2. Component identification and pinout .............................................................................................................................. 15

NE5532AN Dual operational amplifier ......................................................................................................................................................................................................... 15

LM311 Voltage comparator .......................................................................................................................................................................................................................... 15

4N29 Opto-isolator ........................................................................................................................................................................................................................................ 15

LM13600 Dual operational transconductance amplifier .............................................................................................................................................................................. 15

2N5064 Sensitive gate thyristor ................................................................................................................................................................................................................... 15

IRFZ44 TMOS power field effect transistor .................................................................................................................................................................................................. 16

2N3904 (NPN) and 2N3906 (PNP) Small-signal transistors ......................................................................................................................................................................... 16

MJE15032 (NPN) and MJE15033 (PNP) Driver transistors .......................................................................................................................................................................... 16

MAC224 Triac ............................................................................................................................................................................................................................................... 16

2SC5200 (PNP) and 2SA1943 (NPN) Power transistors ...............................................................................................................................................................................16

3. Troubleshooting: Symptoms, causes, & remedies .......................................................................................................17

3.1 Excessive current draw .................................................................................................................................................................................... 17

Symptoms covered: ....................................................................................................................................................................................................................................... 17

Possible situations: ........................................................................................................................................................................................................................................ 17

3.2 Protection, muting, and turn-on/turn-off delay problems ...................................................................................................................... 17

Symptoms covered: ....................................................................................................................................................................................................................................... 17

Possible situations: ........................................................................................................................................................................................................................................ 17

3.3 Faults with signal present ............................................................................................................................................................................... 18

Symptoms covered: ....................................................................................................................................................................................................................................... 18

Possible situations: ........................................................................................................................................................................................................................................ 18

3.4 Instability .............................................................................................................................................................................................................. 19

Symptoms covered: ....................................................................................................................................................................................................................................... 19

Possible situations: ........................................................................................................................................................................................................................................ 19

3.5 Power supply & rail balancing problems ...................................................................................................................................................19

Symptoms covered: ....................................................................................................................................................................................................................................... 19

Possible situations: ........................................................................................................................................................................................................................................ 19

Table 1: Bias and current limit adjustments .................................................................................................................................................................................................. 20

4. ISA calibration procedures ................................................................................................................................................21

4.1 Setting bias ........................................................................................................................................................................................................... 21

Tools and resources you will need: ................................................................................................................................................................................................................ 21

Procedure ...................................................................................................................................................................................................................................................... 21

4.2 Setting positive and negative current limits............................................................................................................................................. 21

Technical Service Manual 3 ISA Series Power Amplifiers

Table of Contents continued

Tools and resources you will need.................................................................................................................................................................................................................21

Procedure ...................................................................................................................................................................................................................................................... 21

5. Servicing ISA amplifiers ......................................................................................................................................................23

5.1 Mechanical disassembly and re-assembly ............................................................................................................................................... 23

Removing the channel modules .................................................................................................................................................................................................................... 23

Removing the AC board ................................................................................................................................................................................................................................ 23

6. Replacement parts ................................................................................................................................................................24

6.1 ISA280 parts and assemblies .......................................................................................................................................................................... 24

ISA280 Power Amplifier ................................................................................................................................................................................................................................ 24

Chassis Assembly ISA280 (beginning June 2006) ........................................................................................................................................................................................ 24

Chassis Assembly ISA280 (before June 2006) ............................................................................................................................................................................................. 25

Main PCB Assembly ISA280 ......................................................................................................................................................................................................................... 26

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T .............................................................................................................................................................. 28

6.2 ISA300T parts and assemblies ........................................................................................................................................................................ 30

ISA 300T Power Amplifier ............................................................................................................................................................................................................................. 30

Chassis Assembly ISA300T ........................................................................................................................................................................................................................... 30

Main PCB Assembly ISA300T .......................................................................................................................................................................................................................31

PCB Assembly, AC/Input ISA280 300Ti, 300T, 450, 500Ti, & 500T ............................................................................................................................................................... 33

6.3 ISA300Ti parts and assemblies.......................................................................................................................................................................34

ISA300Ti Power Amplifier.............................................................................................................................................................................................................................. 34

Chassis Assembly ISA300Ti (beginning June 2006)...................................................................................................................................................................................... 34

Chassis Assembly ISA300Ti (before June 2006) ........................................................................................................................................................................................... 35

Main PCB Assembly ISA300Ti ...................................................................................................................................................................................................................... 36

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T .............................................................................................................................................................. 38

6.4 ISA450 parts and assemblies .......................................................................................................................................................................... 39

ISA450 Power Amplifier ................................................................................................................................................................................................................................ 39

Chassis Assembly ISA450 (beginning June 2006) ........................................................................................................................................................................................ 39

Chassis Assembly ISA450 (before May 2006) .............................................................................................................................................................................................. 40

Main PCB Assembly ISA450 ......................................................................................................................................................................................................................... 41

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T .............................................................................................................................................................. 43

6.5 ISA500T parts and assemblies ........................................................................................................................................................................ 44

ISA 500T Power Amplifier ............................................................................................................................................................................................................................. 44

Chassis Assembly ISA 500T .......................................................................................................................................................................................................................... 44

Main PCB Assembly ISA 500T ...................................................................................................................................................................................................................... 45

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T .............................................................................................................................................................. 47

6.6 ISA500Ti parts and assemblies.......................................................................................................................................................................48

ISA500Ti Power Amplifier.............................................................................................................................................................................................................................. 48

Chassis Assembly ISA500Ti........................................................................................................................................................................................................................... 48

Main PCB Assembly ISA500Ti ...................................................................................................................................................................................................................... 49

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T .............................................................................................................................................................. 51

6.7 ISA750 parts and assemblies .......................................................................................................................................................................... 52

ISA750 Power Amplifier ................................................................................................................................................................................................................................ 52

Chassis Assembly ISA750 (beginning May 2006) ......................................................................................................................................................................................... 52

Chassis Assembly ISA750 (before May 2006) .............................................................................................................................................................................................. 53

Main PCB Assembly ISA750 ......................................................................................................................................................................................................................... 54

PCB Assembly, AC/Input ISA750, 800Ti, & 800T .......................................................................................................................................................................................... 56

6.8 ISA800T parts and assemblies ........................................................................................................................................................................ 58

ISA800T Power Amplifier .............................................................................................................................................................................................................................. 58

Chassis Assembly ISA800T ........................................................................................................................................................................................................................... 58

Main PCB Assembly ISA800T .......................................................................................................................................................................................................................59

PCB Assembly, AC/Input ISA750, 800Ti, & 800T .......................................................................................................................................................................................... 61

6.9 ISA800Ti parts and assemblies.......................................................................................................................................................................62

ISA800Ti Power Amplifier.............................................................................................................................................................................................................................. 62

Chassis Assembly ISA800Ti........................................................................................................................................................................................................................... 62

Main PCB Assembly ISA800Ti ...................................................................................................................................................................................................................... 63

PCB Assembly, AC/Input ISA750, 800Ti, & 800T .......................................................................................................................................................................................... 65

6.10 ISA1350 parts and assemblies ...................................................................................................................................................................... 66

ISA1350 Power Amplifier .............................................................................................................................................................................................................................. 66

Chassis Assembly ISA1350 (beginning May 2006) ....................................................................................................................................................................................... 66

Chassis Assembly ISA1350 (before May 2006) ............................................................................................................................................................................................ 66

Main PCB Assembly ISA450 ......................................................................................................................................................................................................................... 66

PCB Assembly, AC/Input ISA......................................................................................................................................................................................................................... 70

4 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Table of Contents continued

7. Schematics and diagrams .................................................................................................................................................. 71

7.1 ISA Series Chassis Assemblies ...................................................................................................................................................................... 71

7.2 ISA280 (1st generation) Schematics............................................................................................................................................................. 94

7.3 ISA280 (revised) Schematics........................................................................................................................................................................... 97

7.4 ISA300T Schematics.........................................................................................................................................................................................100

7.5 ISA300Ti Schematics........................................................................................................................................................................................ 103

7.6 ISA450 (1st generation) Schematics...........................................................................................................................................................106

7.7 ISA450 (revised) Schematics.........................................................................................................................................................................109

7.8 ISA500T Schematics.........................................................................................................................................................................................112

7.9 ISA500Ti Schematics........................................................................................................................................................................................ 115

7.10 ISA750 (1st generation) Schematics ........................................................................................................................................................118

7.11 ISA750 (revised) Schematics ......................................................................................................................................................................121

7.12 ISA800T Schematics ......................................................................................................................................................................................124

7.13 ISA800Ti Schematics ..................................................................................................................................................................................... 127

7.14 ISA750, ISA800T, ISA800Ti Component locations..................................................................................................................................130

7.15 ISA1350 Schematics ....................................................................................................................................................................................... 132

7.16 ISA1350 Component locations .................................................................................................................................................................... 136

ISA Series Performance Specifications

ISA280 & ISA300Ti ISA450 & ISA500Ti ISA750 & ISA800Ti ISA1350

OUTPUT POWER

DYNAMIC HEADROOM 2 dB @ 4Ω 2 dB @ 4Ω 2 dB @ 4Ω 2 dB @ 4Ω DISTORTION

FREQUENCY RESPONSE 20 Hz–20 kHz, +0/-1 dB

DAMPING FACTOR > 300 @ 8Ω > 300 @ 8Ω > 300 @ 8Ω > 250 @ 8Ω NOISE (unweighted 20 Hz to 20 kHz, below rated output) 100 dB 100 dB 100 dB 100 dB VOLTAGE GAIN 31.6× (30 dB) 40× (32 dB) 50× (34 dB) 64× (36 dB) INPUT SENSITIVITY, V RMS

in watts

FTC: 20 Hz–20 kHz @ 0.1% THD, both channels driven, direct outputs

8W per channel 185 260 450 800 4W per channel 280 400 650 1300

FTC: 50 Hz–16 kHz @ 0.5% THD, both channels driven, transformer outputs

70V or 100V (per channel) 300 (ISA 300Ti) 500 (ISA 500Ti) 800 (ISA 800Ti) 25V (per channel) 240 (ISA 300Ti) 400 (ISA 500Ti) 640 (ISA 800Ti)

FTC: 20 Hz–20 kHz @ 0.5% THD, both channels driven, direct outputs

70V (per channel) 1500

EIA: 1 kHz @ 0.1% THD, both channels driven

8Ω per channel 200 280 500 850 4Ω per channel 300 450 750 1400

1 kHz @ 1% THD, typical, both channels driven

2Ω per channel 430 700 1200 2000

Bridge Mono:

8Ω, 20 Hz–20 kHz, 0.1% THD 530 800 1300 2600 8Ω, 1 kHz, 0.1% THD 600 900 1500 2800 4Ω, 1 kHz, 1% THD, typical 830 1400 2400 4000 140V or 200V, 50 Hz–16 kHz, 0.5% THD 600 (ISA 300Ti) 1000 (ISA 500Ti) 1600 (ISA 800Ti) 140V, 20 Hz–20 kHz, 0.5% THD (direct outputs) 3000 50V, 50 Hz–16 kHz, 0.5% THD 480 (ISA 300Ti) 800 (ISA 500Ti) 1280 (ISA 800Ti)

SMPTE-IM < 0.01% < 0.01% < 0.02% < 0.02%

(at 10 dB below rated output power) -3 dB points: 5 Hz and 50 kHz

full rated power @ 8Ω 1.15v (+3.4 dBu) 1.15v (+3.4 dBu) 1.23v (+4.0 dBu) 1.24v (+4.1 dBu)

continued

Technical Service Manual 5 ISA Series Power Amplifiers

ISA Series Performance Specifications (continued)

ISA 280 & ISA 300Ti ISA 450 & ISA 500Ti ISA 750 & ISA 800Ti ISA 1350

INPUT IMPEDANCE 10 kΩ unbalanced

CONTROLS Front: AC switch, Ch. 1 and Ch. 2 gain

INDICATORS POWER: Green LED CLIP: Red LED, 1 per channel

CONNECTORS Input: Active balanced; XLR (pin 2 +) and detachable Euro-style terminal blocks

COOLING Continuously variable speed fan, back-to-front air flow AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic, and RF protection

LOAD PROTECTION Turn-on/turn-off muting, AC coupling, triac crowbar (on each channel) OUTPUT CIRCUIT TYPE A B AB H (2-tier) H (3-tier)

DIMENSIONS 19.0" (48.3 cm) wide, 5.25" (13.3 cm) tall (3 rack spaces)

WEIGHT Shipping:

20 kΩ balanced

Rear: 10-position DIP switch

SIGNAL: Yellow LED, 1 per channel

Output: Screw terminals with safety shroud DataPort V2: HD-15 female

Stable into reactive or mismatched loads

AB: Class AB+B complementary linear output H: Class AB+B complementary linear output with Class H 2- or 3-tier high efficiency circuit

15.9" (40 cm) deep (rack mounting to rear support ears)

ISA 280: ISA 300Ti:

42 lb (19.1 kg)

50 lb (22.7 kg)

ISA 450: ISA 500Ti:

46 lb (20.9 kg)

55 lb (25 kg)

ISA 750:

50.5 lb (23 kg) 68 lb (30.8 kg)

ISA 800Ti:

63 lb (28.6 kg)

Net:

ISA 280:

35 lb (15.9 kg)

ISA 300Ti:

44 lb (20 kg)

ISA 450: ISA 500Ti:

40 lb (18.2 kg)

49 lb (22.3 kg)

POWER REQUIREMENTS Available for 120 or 220–240 VAC, 50/60 Hz

1

2

POWER CONSUMPTION

@ 120 VAC

(both channels driven)

Multiply currents by 0.5 for 230V units

eldI

8

ΩΩΩΩΩ

4

ΩΩΩΩΩ

2

ΩΩΩΩΩ

lacipyT

lluF

A5.0

A3A1.4A4.7

A5.4A6.6A5.11

A5.6*A5.9*A71

3

xaM

8

4

2

eldI

ΩΩΩΩΩ

1

lacipyT

A5.0

A7.3A4.5A01

A6A6.9A61

A3.9*A7.41*A52

ISA 750:

44.5 lb (20.2 kg) 77 lb (34.4 kg)

ISA 800Ti:

57 lb (26 kg)

2

3

lluF

xaM

8

4

2

eldI

ΩΩΩΩΩ

1

2

lacipyT

lluF

A6.0

A4A7.9A4.61

A3.6A6.51A72

A2.9*A32*A14

3

xaM

Typical1Full2Max

1.2 A

Idle

6.4 A 12.5 A 25.5 A

8

Ω

10 A 20 A 42 A

4

Ω

14.5 A 31 A* 66 A*

2

Ω

US patents pending

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

3

6 QSC Audio Products, Inc.

TD-000163-00 Rev. A

1. Introduction

1.1 Restriction of Hazardous Substances Directive (RoHS)

Beginning in June 2006 (serial number date code 0606xxxxx), all ISA Series amplifiers are manufactured to conform to the European Union’s RoHS Directive, which reduces the amount of hazardous substances allowed in products for sale within its member nations. In electronic equipment such as audio power amplifiers, this applies primarily to certain toxic heavy metals, such as lead, which may be present in electronic components, solder, and other parts.

RoHS-compliant materials

When servicing RoHS-compliant amplifiers, it is important for the service technician to use only RoHS-compliant components and solder (lead-free). All replacement parts provided by QSC for RoHS-compliant products are certified as RoHS compliant.

RoHS-compliant tools

Soldering irons and desoldering apparatus used on RoHS-compliant products must also not be contaminated by hazardous substances, such as lead. Therefore, you cannot use the same soldering and desoldering tools for RoHS-compliant products and solder as you do for non-compliant products and solder. You must either use separate soldering irons, desoldering tools and braid, etc., or at the very least designate separate tips and braids and use only the appropriate ones. If you contaminate a tip or braid, even inadvertently, by using it on a non-compliant product or solder, you can no longer use it with RoHS-compliant products or solder.

1.2 Service bulletins

Contact QSC Technical Services to make sure you have the most up-to-date service bulletins for ISA Series amplifiers. Service bulletins may be distributed in hard copy, via fax, and electronically (Adobe Acrobat PDF) via CD-ROMs, FTP from the QSC web site (www.qscaudio.com), and e-mail.

One service bulletin has been issued for the ISA Series at the time this manual was printed: ISA0001, “ISA Turn-on Hangup” (ISA450, ISA500T, ISA750 and ISA800T)

1.3 The well-equipped service bench

To properly service ISA amplifiers, a technician needs the right tools. The technician’s service bench should have the following equipment:

• Digital multimeter with RMS AC voltage and current

• Digital clamp-on ammeter

• Dual-trace oscilloscope

• Audio distortion analyzer

• Non-inductive load resistors, configurable as 8 ohms (min. 500 watts capacity), as 4 ohms (min. 750 watts capacity), and 2 ohms (min. 1200 watts capacity)

• Variable AC voltage source, such as a Variac or Powerstat variable transformer, with a rated current capacity of up to 25A (for 120V models) or 12A (for 230V models)

• Low-distortion audio sine wave generator

• Philips and flat screwdrivers

• Soldering iron with a fine tip (25–60W recommended)

• Rosin-core solder (RoHS-compliant solder, or 60/40 or 63/37 for non-RoHS product only)

• Long-nose pliers

• Diagonal cutters

• Wire strippers

Automated test equipment, such as an Audio Precision workstation, is very useful for servicing ISA amplifiers. Contact QSC Technical Services to obtain applicable AP test files.

Technical Service Manual 7 ISA Series Power Amplifiers

1.4 Working with surface-mount components

ISA amplifiers, like many modern electronic products, use surface-mount technology (SMT) components where appropriate in order to make high-density circuitry that is reliable and economical to manufacture.

SMT components in the ISA amps are used in the small-signal and control circuits, so they do not handle significant amounts of power; therefore, they are subject to very little stress and should seldom fail. Sometimes they do fail, or they require replacement for a performance upgrade or modification. Thus, it is important to know how to work with SMT components.

Specialized tools and equipment exist for soldering, unsoldering, and removing SMT components quickly and efficiently, but they are often expensive. Most SMT repairs, though, can be handled reasonably well with common tools and equipment, such as tweezers, solder braid, and fine-tip soldering irons. The original factory components are tacked to the board with a spot of glue, so you might have to apply some force to break the adhesive.

Two-terminal components (resistors, capacitors, diodes, etc.)

Removal 1 Use two soldering irons, preferably about 25 to 40 watts, with fine tips.

2 With a soldering iron in each hand, hold one tip on the solder at one end of the component and the other

tip on the other end (Figure 1.1).

3 Once the solder melts on both ends, grip the component between the two tips and lift it from the circuit

board.

4 Use solder braid and a soldering iron to remove the solder from the two pads (Figure 1.2). Insertion 1 With a soldering iron and appropriate solder, melt just enough solder onto one pad to create a small

mound (Figure 1.3).

2 Grasp the component in the middle with tweezers. Melt the small mound of solder with the iron and

place the component across the two pads (in the correct orientation, if the component is sensitive to direction) and press it flat against the circuit board, with one end of the component immersed in the melted solder (Figure 1.4).

3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the component in place. 4 Fully solder the other end of the component to its pad. Let the solder harden (Figure 1.5). 5 Fully solder the tacked end of the component to its pad (Figure 1.6).

Figure 1.1.

Solder braid

Figure 1.2.

Three-terminal components (transistors, etc.)

Removal 1 With a soldering iron and solder braid, remove as much solder as possible from the middle terminal of

the component.

2 With a soldering iron in each hand, hold one tip on the solder at the terminal at one end of the compo-

nent and the other tip on the terminal at the other end.

3 When the solder on both ends melts, grip the component between the two tips and lift it from the circuit

board. You might need to quickly touch the pad on the middle terminal with a soldering iron to melt any remaining solder that might be holding the component down.

4 Use solder braid and a soldering iron to remove the solder from the three pads. Insertion 1 With a soldering iron and appropriate solder, melt just enough solder onto one pad to create a small

mound of solder.

2 Grasp the component with tweezers. Melt the small mound of solder with the iron and place the

component in the correct orientation across the three pads and press it flat against the circuit board, with one terminal of the component pressed into the melted solder.

3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the

component in place.

4 Fully solder the other terminals of the component to their pads. Let the solder harden. 5 Fully solder the tacked terminal of the component to its pad.

Solder

Figure 1.3.

Tweezers

Figure 1.4.

Solder

Figure 1.5.

Solder

Figure 1.6.

8 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Multi-pin components (ICs, etc.)

Removal

Removing a multi-pin SMT component is a delicate procedure. Ideally, you should use a soldering iron with an attachment that allows you to heat all the pins simultaneously.

If such a soldering device is not available, use this procedure:

1 Use a soldering iron and solder braid to remove as much solder as possible from the pins of the component. 2 With fine tweezers, carefully try to lift each pin to see if it’s free. If it’s not, touch it with the tip of the soldering iron and if necessary,

use the solder braid to remove the remaining solder.

3 Repeat the process until all the pins are free and you can remove the component. Insertion 1 With a soldering iron and appropriate solder, melt just enough solder onto one pad to create a small mound of solder. It is usually

easiest to use a pad that corresponds to one of the end or corner pins of the component.

2 Grasp the component with tweezers. Melt the small mound of solder with the iron and place the component in the correct orientation

upon its pads and gently press it flat against the circuit board, with the appropriate terminal of the component pressed into the melted solder.

3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the component in place. 4 Fully solder the other terminals of the component to their pads. Let the solder harden. 5 Fully solder the tacked terminal of the component to its pad.

Technical Service Manual 9 ISA Series Power Amplifiers

1.5 Series description

QSC’s ISA Series amplifiers are entry-level professional audio products for installed sound systems, designed for good, basic performance and reliability at low price. The series comprises seven current models—the ISA280, ISA300Ti, ISA450, ISA500Ti, ISA750, ISA800Ti, and ISA1350—and three discontinued ones— the ISA300T, ISA500T, and ISA800T.

Outputs for distributed lines

While all ISA models can drive low-impedance speaker loads as low as 2 ohms per channel, the three ending in “Ti” also have isolated transformer-coupled outputs for driving 25-, 70-, or 100volt lines. The “T” models preceded the “Ti” ones and had nonisolated autoformer-coupled outputs; other than this distinction, they are the same as the “Ti” models. Note: For the sake of

brevity, information that pertains to both versions will be combined in descriptions of the “Ti” models, except where otherwise noted.

Each model has two audio channels and is three rack spaces tall. See page 2 for complete specifications.

The ISA280, ISA300Ti, ISA450, and ISA500Ti have single-sided printed circuit boards. The ISA750, ISA800Ti, and ISA1350 use double-sided boards.

1.6 Technical descriptions and theory of operation

Note: Some of these descriptions concern circuitry that is duplicated in the amplifier’s two channels. For the sake of simplicity, the descriptions are of Channel 1 only. Components in Channel 1 have a 3-digit designation with “1” as the first digit; their equivalents in Channel 2 have a “2” as the first digit, followed by the same two numerals. For example, R122 and R222 have identical functions in their respective channels.

Power supplies

Unlike other recent QSC amplifiers, the ISA line uses strictly conventional power supplies, with large transformers that operate at the 50 or 60 Hz frequency of the AC line. The electrical current in the secondary circuitry is converted to DC through a full-wave bridge rectifier. The resulting 100 or 120 Hz ripple is filtered out by large capacitors that also serve as current reservoirs for shortterm, transient demands.

The supply provides a bipolar set of supply rails for each channel, with equal quiescent positive and negative voltages, as shown in Figure 1.7. Note that unlike many bipolar supplies for complementary transistor arrangements, the secondary windings are not connected to ground at the center.

Figure 1.7

+Vcc

Channel 1

-Vcc

+Vcc

Channel 2

-Vcc

This is because the output

+110V

transistors are directly mounted to the heat sink, metal-to-metal, to maximize

-110V

+55V

Channel 1

heat transfer; this grounds the collectors, requiring somewhat different output and power supply arrange-

-55V

Ch. 1 Center Tap

0.047 µF

12 5W×2Ω

ments. The groundedcollector concept is

To Channel 2 Center Tap

described later in this chapter.

Figure 1.8

In the ISA 750 and ISA 800T, the secondaries are tapped to provide an intermediate set of bipolar rails for the Class H output circuitry. Figure 1.8 shows one channel. Class H operation is described later in this chapter.

The 24-volt cooling fan is driven by a separate DC supply that is powered by a 20-volt tap on the transformer primary. To minimize fan noise, the fan speed is controlled by varying its actual DC voltage in response to the amplifier’s heat sink temperatures. An optocoupler isolates the fan control circuitry from the thermal sensors.

Audio circuitry

The audio inputs are balanced to offer a reasonably high amount of common-mode noise rejection. The input balancing is done using a single op amp (one half of an NE5532 dual op amp) arranged as a differential amplifier. The degree of common-mode rejection is dependent on a close match between the input resistors (R100 and R101 in Figure 1.9) and between the feedback resistor and the shunt resistor (R105 and R106). The circuitry uses 1% precision resistors to ensure at least 40 dB of common-mode rejection.

C101

180p-5%

^C_0805

+IN_A

-IN_A

R100

10.0K

^R_0805

R101

10.0K

^R_0805

R102

1K

^R_0805

To LM13600 operational

transconductance amp

Figure 1.9

The feedback and shunt capacitors, C101 and C103, add a firstorder high-frequency roll-off, down 3 dB at 88.4 kHz (over two

R105

10.0K

^R_0805

NE5532

U101:1

+

3

-

2

R106

10.0K

^R_0805

C103

180p-5%

A1

C106

1

10-50NP

R112

10K

10K LINEAR 3B RIGHT ANGLE POT

CW

R113

W

270

^R_0805

CCW

A1

10 QSC Audio Products, Inc.

TD-000163-00 Rev. A

octaves above the high end of the audio spectrum). This makes the amplifier less susceptible to RF interference, high-frequency oscillations, etc.

Also in this stage, the feedback loop contains one half of a 13600 dual operational transconductance amplifier (Figure 1.10). The OTA is part of the clip limiter circuitry; when the clip limiter is activated, a control voltage increases the transconductance of the OTA, which essentially decreases the impedance of the feedback loop and reduces the gain of the stage in order to reduce the amount of clipping.

To input op amp U101:1

+14V

R108

7.50K ^R_0805

R107

U10:1

LM13600M

11

5

7

R103

R104

1

10.0K ^R_0805

150K

^R_1206

-14V

8

+

-

C105

39K

^R_0805

3

2

4

^R_0805

100

R111

^R_0805

A1

100-25V

R110

270

^R_0805

R109

100

3906

Q100

From clip detection

820

R115

CLIP LIMIT SWITCH (Open to defeat clip limiter)

^R_1206

Figure 1.10

The gain control uses a linear potentiometer, but the impedances loading the wiper to ground make the pot approximate an audio taper over most of its rotation. After the wiper, RC networks roll off the low end, if the LF filter is set for that channel, at either 30 or 50 Hz, depending on the DIP switch setting on the rear panel.

The next active device is another 5532 op amp, U101:2. Its output drives the driver transistors, which in turn drive the output transistors. The output section has a Class AB+B configuration; the drivers (a complementary pair, Q105 and Q106, comprising an NPN MJE15032 and a PNP MJE 15033) are class AB. A series network of two diodes and a 100-ohm trimpot provide the small amount of forward bias on the transistor pair to keep crossover distortion minimal. In parallel with the trimpot is a 50-ohm thermistor with a negative temperature coefficient; as the circuitry warms, its resistance decreases. This reduces VBE on both Q105 and Q106, decreasing the bias current to reduce the threat of thermal runaway. The base of each driver transistor is tied to ground through a diode and a 2.2K trimpot in series; these set the current limiting threshold for their respective signal polarities.

The collector of each driver transistor directly drives the bases of its output transistors, which are the main power-handling signal devices. If you’re not familiar with the grounded-collector scheme, the arrangement of the output transistors might look somewhat

strange: the positive voltage swings are handled by PNP transistors, while the negative swings are handled by NPN devices. The collectors all connect to ground, which allows them to be mounted directly to the heat sink—metal-to-metal, without insulators in between—for the best possible transfer of heat away from the transistors. The emitters of the PNP and NPN transistors are coupled through resistors to the positive and negative supply rails, respectively, forming banks of common-emitter circuits driving the supply rails. Consequently, the devices drive the rails with the audio signal, which rides atop the DC. The output to the speaker load is taken from the point between the positive and negative reservoir capacitors; this is also where the negative feedback is taken from. The nature of this arrangement, with audio signal riding on the supply rails, is why the power supply has no ground reference.

Another unusual characteristic of the grounded-collector output section is that the signal at the output to the speaker is actually opposite in polarity to the signal at the op amp output. This is why the negative feedback resistor, R122, connects to the op amp’s non-inverting input instead of the inverting input.

The output point of the circuit couples to the output connector through an RLC network (R160, R161, R162, L100, and C124) that serves as a high-frequency snubber and also helps keep the amp circuitry stable when driving capacitive loads.

Clip detection

The output of the op amp also drives a group of four diodes (D102, D103, D105, and D106) arranged as a full-wave rectifier. Normally, the op amp’s output signal level is about 1 volt or less, which is all it takes to drive the driver transistors.

But because this point is within the overall feedback loop, when clipping occurs, the op amp puts out a much higher signal voltage to try to make the output signal track the input. The four diodes rectify the voltage to drive the clip indicator LED, LD100. The current exiting the full-wave rectifier passes to ground through R127 and also drives the base of transistor Q100 through R115. If the clip limiter is switched on, Q100’s emitter is grounded, and when the voltage across R127 goes sufficiently negative to forward-bias Q100, which sends current through R111 and R103 into the amplifier bias input of the operational transconductance amplifier (OTA), U10:1. The OTA is in the negative feedback loop of U101:1, and increasing its transconductance essentially reduces the impedance of the feedback loop, which reduces the gain of the op amp stage. This reduces the signal level until the amount of clipping is minimal. When the clipping stops, Q100 is no longer forward-biased, and the gain returns to normal.

DC protection

The ISA750 and ISA800T have a crowbar circuit, based on a triac and two silicon controlled rectifiers, on each output to protect against DC faults. If an amp channel puts out a DC voltage, which could be the result of a component or circuit failure, it will first trigger either D119 or D120, depending on the polarity of the

Technical Service Manual 11 ISA Series Power Amplifiers

voltage. The triggered SCR will in turn trigger triac Q113, shorting the output to ground through fuse F100. The fuse will blow, safeguarding the speaker load from the DC fault.

The output sections of the ISA280, ISA300T, ISA450, and ISA500T are AC coupled.

Class H

The ISA750 and ISA800Ti utilize a two-tier Class H output section. It is essentially a Class AB+B circuit but with two sets of bipolar supply rails. On both the positive and the negative sets of rails, a comparator circuit, called a “step driver,” compares the audio signal to the lower rail voltage. When necessary to fully reproduce the signal’s voltage swing—just before the signal voltage reaches the lower rail voltage—the step driver turns on a TMOS power FET to pull the output transistors’ supply rail up from the lower voltage to the higher one, and then back down again when the signal allows. By keeping the transistors’ supply rails low whenever possible, the devices dissipate less unused power and generate less waste heat, making the amplifier more efficient than a straight class AB amplifier with the same power points.

The comparators are 311-type ICs: U170 on the positive step and U171 on the negative. Each one drives a high-gain complementary transistor pair (2N3904 + 2N3906), which drive the gate of their respective MOSFET.

The ISA 1350 has a three-tier Class H output section. It works in much the same way as the two-tier arrangement, but the additional step further increases the amplifier’s electrical efficiency.

Bridged mono operation and protection

When the amplifier is operated in bridged mono, its two channels work in tandem to produce up to twice the voltage swing that a single channel is capable of. To do this, Channel 2 produces a signal identical to Channel 1’s, but opposite in polarity—in other words, a mirror image.

Channel 2’s signal feed (bus BR_MONO_FEED) is an attenuated version of the signal on Channel 1’s speaker bus. Closing DIP switch #6 (set to “BRIDGE MONO ON”), connects the BR_MONO_FEED bus on Channel 1 to the BR_RET bus on Channel

2. The BR_RET bus drives the non-inverting input of op amp U201:2 directly.

With two channels operating as one, but each having its own feedback and protection circuitry, it is vital to keep both running as mirror images. A protection circuit monitors the balance between Channel 1’s and Channel 2’s signals. Resistors R22 and R23 (R22A, R22B, R23A, and R23B in the ISA 750 and ISA 800T) are equal in value and form a voltage divider between the two channel outputs. If the output signals are mirror images, the voltage at the junction of the resistors (bus BR_BAL) will be zero. If the signals are not mirror images—for example, one channel is defunct, distorting, or reduced in gain—a voltage will appear on BR_BAL. Through DIP switch 7, the BR_BAL bus becomes bus BR_CUT and feeds the

bases of transistors Q8 and Q6, which are part of a 4-transistor circuit across the +15V and -15V rails that supply the op amps and the input circuitry. If the voltage on BR_CUT goes positive enough to forward-bias Q8, the transistor’s collector will collapse the +15V rail. At the same time, the emitter current from Q8 will flow through R25 and into the emitter of Q7, forward-biasing it, too. The collector of Q7 will then collapse the -15V rail.

Similarly, if BR_BAL goes sufficiently negative, it will forward-bias Q6, in turn forward-biasing Q9, and these will collapse the ±15V rails.

With the rails collapsed, the op amp and the input circuitry will not function, which will mute the audio.

Output transformers and autoformers

The amplifiers whose model numbers end in “T” have a tapped autoformer on each channel output. The autoformer allows a channel to drive distributed speaker lines by converting the output voltage to an appropriate level. For example, either channel of the

25V

100V

AUTOFORMER

70V

From amplifier

output circuitry

Figure 1.11

ISA300T (Figure 1.11) can put out a maximum signal level of about 34 volts rms at its low-impedance output terminals, but the autoformer steps it up to about 70 volts (between the 0 and terminals) or 100 volts (between the 0 and driving lines of those respective voltages. Also, the channel can drive a 25-volt line connected across the 70 and Note that one side of the output is at chassis ground potential.

The “T” models were replaced by the “Ti” ones, which use transformers to develop the 25-, 70-, and 100-volt outputs (Figure

1.12). The main benefit is the full electrical isolation between the primary (the amplifier’s internal circuitry) and the secondary (the distributed loudspeaker line), which some electrical and safety codes may require.

~34V:

8, 4, or 2Ω

100

terminals) for

100

terminals.

70

12 QSC Audio Products, Inc.

TD-000163-00 Rev. A

25V

70V

From amplifier

output circuitry

8, 4, or 2

Figure 1.12

1.7 ISA1350 circuitry

Compared to the utter simplicity of the lower power ISA models like the ISA280, the ISA1350’s circuitry might seem so complex that it should belong to another family of power amps. This added complexity primarily concerns two particular areas of the amplifier—the class H power supply rail steps and the bias circuitry— and provides these benefits:

• Three-tier class H output section—the additional tier

further exploits the dynamic nature of audio to improve the amplifier’s electrical efficiency to as much as 55% better than a class AB amplifier of a comparable power rating. Despite the added circuitry and complexity, this allows substantial savings in components and materials costs by scaling down power transformers, using fewer output devices, and removing less waste heat.

• Improved thermal bias tracking and better fault protec- tion muting—instead of using a simple bias network based on a series diode pair, the ISA1350 features an “active” bias network that uses current sources to set bias. An NTC thermistor mounted to the heat sink tracks the operating temperature of the output devices and directs the current sources to compensate for optimal bias; the thermal tracking circuitry is thus isolated from the audio signal, so it can perform with great precision. The protection circuits for faults, overcurrent, etc., are also tied into the bias network, so they can shut off the bias if a serious problem occurs. Shutting off the bias then shuts off current in the output transistors. This is a highly effective and inherently balanced approach to fault protection, which is especially important in a very high power amplifier. This is also how the turn-on and turn-off muting is handled.

100V

Class H step drivers

The step driver circuitry in the ISA1350’s three-tier class H system is very similar to the one used in the two-tier system of the ISA750 and ISA800Ti. Since the normal voltage limit for 1206-type surface-mount resistors is 200 volts and the voltages that the step driver’s voltage sensing resistors see may reach 300 volts, the ISA1350 uses 100 kΩ 1206 resistors in series pairs instead of single 200 kΩ components.

Bias circuitry

The new circuitry (see Figure 1.13) for the bias network features transistors Q108 and Q109, with surrounding resistors, forming 8 mA current sources, with less loading of the op amp output than the resistors used on older RMX and ISA models. These currents forward bias diodes D106 and D107, which are in contact with the heat sink. Trimmer R171 adjusts the bias voltage.

The bias currents are controlled by signals +BIAS and –BIAS, which come from a current source Q142, Q143, and R250. The single voltage across R250 determines the voltage across both R161 and R166, which sets the bias currents equally for the PNP and NPN drivers.

The voltage on R250 is controlled by the voltage at the collector of Q132, which forms a Vbe multiplier controlled by R226 and R227. The collector voltage is a multiple of the base voltage, with a nominal value of 5.45 times the base voltage. A typical 25°C base voltage is 0.68 V, resulting in a collector voltage of 4.4 V. The current thru R233 subtracts about 1 V from this, and stabilizes the voltage against changes in supply voltage. As the amplifier heats up, the base voltage declines somewhat, and therefore, the BIAS signals are reduced, which adds more thermal compensation.

The thermal sensor R239 is a 10 kΩ NTC resistor (not a PTC as used in the other models); its resistance decreases with rising temperature. This increases voltage across R240, and thus reduces voltage between Q142 and Q143, which reduces bias currents. The voltage on R240 ranges from almost zero when cold, to about 0.6 V at maximum temperature.

Muting via the bias network

Muting occurs when the emitter current for Q141 is removed, thus shutting down Q142 and Q143 and removing all bias from the output section. The emitter current for Q141, through R238, is controlled by the voltage on C131.

• When the amp is turned on, C131 ramps up from zero, using a small current from R220. When the voltage on C131 exceeds the voltage on the collector of Q132 (the bias reference voltage), Q141 is turned on, and the bias circuit is enabled.

• When the amp is turned off, circuitry on the AC board pulls down on D119 and quickly discharges C131, thus muting the amplifier.

• When the amplifier reaches full temperature, circuitry on the AC board senses the voltage on the FAN-SP line, from D122, and triggers the discharge circuit for D119, thus muting the amplifier.

Technical Service Manual 13 ISA Series Power Amplifiers

Figure 1.13

DC fault protection

The ISA1350 uses a DC crowbar circuit, similar to that used on the ISA750 and ISA800Ti, on each channel output.

1.8 Revisions made during production

ISA750 and ISA800T

April 2002—Zener diodes D107, D110, D207, and D210 changed from 5.6V to 4.7V.

channel to hang up when the amplifier is turned on. Channel 1 was most susceptible, and various circumstances tended to aggravate the problem, such as having the low-frequency filters engaged, having an accessory powered by the DataPort, etc. For amps made before the change went into effect, use service bulletin ISA0001 to correct related hang-up problems.

This is to eliminate the tendency of either

14 QSC Audio Products, Inc.

TD-000163-00 Rev. A

2. Component identification and pinout

NE5532AN Dual operational amplifier

OUTPUT A

INVERTING

INPUT A

NON-INVERTING

INPUT A

V-

1

2

3

4

AB

V+

8

OUTPUT B

7

INVERTING

6

INPUT B NON-INVERTING

5

INPUT B

LM311 Voltage comparator

GROUND 1

NON-INVERTING

INPUT

INVERTING

INPUT

1

2

3

V-

4

V+

8

OUTPUT

7

BALANCE/

6

STROBE

BALANCE

5

LM13600 Dual operational transconductance amplifier

AMP BIAS INPUT A

DIODE BIAS A

NON-INVERTING

INPUT A

INVERTING INPUT A

OUTPUT A

BUFFER INPUT A

BUFFER OUTPUT A

1

2

3

4

5

V-

6

7

8

AB

AMP BIAS INPUT B

16

DIODE BIAS B

15

NON-INVERTING

14

INPUT B

INVERTING INPUT B

13

OUTPUT B

12

V+

11

BUFFER INPUT B

10

BUFFER OUTPUT B

9

2N5064 Sensitive gate thyristor

4N29 Opto-isolator

1

2

3

Technical Service Manual 15 ISA Series Power Amplifiers

6

5

KAG

4

IRFZ44 TMOS power field effect transistor

MAC224 Triac

GDS

2N3904 (NPN) and 2N3906 (PNP) Small-signal transistors

C

3

12

BE

BCE

MJE15032 (NPN) and MJE15033 (PNP) Driver transistors

G

MT1

MT2

2SC5200 (PNP) and 2SA1943 (NPN) Power transistors

TOSHIBA

B C E

BCE

16 QSC Audio Products, Inc.

TD-000163-00 Rev. A

3. Troubleshooting: Symptoms, causes, & remedies

When first checking the operation of an amplifier on the bench, always turn your variable transformer down to zero before plugging the amplifier in. After you turn the amplifier on, gradually turn up the AC voltage as you observe the amplifier’s behavior and its current draw; this will help you determine what, if anything, is wrong with it. If you see or smell smoke, flames, or any other signs of short circuits or excessive current draw, quickly turn the AC back down to zero. If no such problems occur, it is usually safe to turn the AC up to the amplifier’s full operating voltage for further testing.

3.1 Excessive current draw

The customer complains of blowing circuit breakers or fuses, or burning smell or smoke.

Symptoms covered:

• Fuses blow immediately

• The amplifier quickly gets very hot

• Line circuit breakers trip at turn-on

• The amplifier hums loudly and the chassis vibrates

• The amplifier emits smoke

• The amplifier gives off a burning smell If the symptoms indicate a possible problem in the channel circuits

or output sections, you can isolate either channel module from the power supply by pulling its fuses from the AC board.

Possible situations:

Excessive current with no signal present

If the amplifier seems to run hot and draws higher-than-normal current when idling at full AC voltage, the cause could be bias misadjustments in the output circuitry of one or both channels. See the calibration procedures in the next section.

Fast increase in current draw (current increases rapidly at only a few volts AC)

• The main bridge rectifiers BR100 and/or BR200 (all models) and BR101 and/or BR201 (ISA750 and ISA800Ti) is reversed or shorted.

• Supply clamp diode pairs D117 and D118 and/or D217 and D218 is reversed or shorted.

• The drivers and/or power transistors is shorted on both polarities (NPN

and

PNP) on one or both channels.

Moderate increase in current draw (current increases slowly, doesn’t become excessive until about ¼ of the amplifier’s full AC operating voltage)

• One polarity’s drivers and/or power transistors (NPN or PNP) is shorted, on one or both channels.

• Individual supply clamp diodes D117, D118, D217, or D218 is reversed or shorted.

• Bias diodes D108, D109, D208, or D209 or bias trimpots R131 or R231 is open.

Slow increase in current draw (current doesn’t become excessive until about half of the amplifier’s full AC operating voltage; amplifier may pass signal)

• The bias is severely misadjusted, or bias diodes D108, D109, D208, or D209 is defective.

• An oscillation is causing excessive current demand.

Runaway current draw (current increases sharply at about 25 to 33% of the amplifier’s full AC operating voltage)

One or more reservoir capacitors is reversed. CAUTION: the gas buildup in a reversed electrolytic capacitor can cause it to vent explosively. Immediately turn off power and let the

capacitor cool down before replacing it.

3.2 Protection, muting, and turn-

on/turn-off delay problems

The customer complains of amplifier locking up, or not turning on and off correctly.

Symptoms covered:

• Both channels do not come out of protect

• Amplifier will not thermally shut down when it should

• Power LED doesn’t light

• Too little or too much muting delay

• No clip limiting

• Fan doesn’t run, or runs always at high speed

Possible situations:

Both channels stay in protect after turn-on

• Q4 or Q5 is shorted base-to-emitter.

• Voltage across D8 should be 14 to 15 volts DC. If it is low, check D8 and R10; also, C7 and C8 is leaky.

• D9, R4, and/or R7 is open.

The amplifier will not thermally shut down when it overheats

Check for shorted D9, R4, or R7; check also for open LD1 (“POWER” LED), R2, or R5.

Technical Service Manual 17 ISA Series Power Amplifiers

Too much or too little muting delay

• Excessive delay at turn-on: check for open LD1, R2, or R5; check for incorrect R10 or R15; check for shorted D9; also see service bulletin RMX0002.

• Too short at turn-on (amplifier unmutes before the circuits stabilize, causing a thump): check for incorrect or bad C7, C8, or R10.

• Amplifier doesn’t stay muted at turn-off: see service bulletin RMX0003

Power LED doesn’t light

Check for open or shorted LD1; check R2.

No clip limiting

• U10 is defective.

• DIP switches SW1:1 or SW1:10 is defective.

Fan doesn’t run

• The fan is defective.

• Check the fan connection to the AC board.

• Check R1 and BR1 on the AC board.

Fan runs always on high speed

• Q3 and/or U2 are shorted.

• Check PTC thermistors R4 and R7.

3.3 Faults with signal present

The customer compains that the amplifier passes a signal but doesn’t run correctly.

Symptoms covered:

• The output signal breaks up or is distorted

• “Ringing” sound in loudspeaker when no audio signal is present

• The output signal collapses when driving a normal speaker load

• Supply rails OK with no signal, but collapse when a signal passes

• The amplifier gets too hot

• One channel clips prematurely

• Excessive hum in loudspeaker when no audio signal is present

The supply rails are OK with no signal but collapse with a signal

• C112, C113, C212, and/or C213 is leaky.

• Check C114, C124, C214, and C224.

The amplifier gets too hot with no load

• Bias trimpots R131 or R231 are misadjusted, burned, or open.

• Bias diodes D108, D109, D208 and/or D209 are incorrect (should be 1N4934).

• If the amplifier is producing high-frequency oscillations, check C114, C124, C214, and C224.

• Check resistors R136, R137, R236, and R237.

• Op amp U101 or U201 is unstable.

One channel clips prematurely

• R146 or R147 (Channel 1) or R246 or R247 (Channel 2) are open.

• R139 or R140 (Channel 1) or R239 or R240 (Channel 2) are misadjusted.

• Check R157, R158, R198 (ISA750 and ISA800Ti only), D115, and D116 (Channel 1) or R157, R258, R298 (ISA750 and ISA800Ti only), D215, and D216 (Channel 2).

• (ISA280, ISA300Ti, ISA450, and ISA500Ti) Check R118 and R119 (Channel 1) or R218 and R219 (Channel 2).

• R130 or R132 (Channel 1) or R230 or R232 (Channel 2) is open.

Excessive hum in loudspeaker when no signal is present (ISA280, ISA300Ti, ISA450, and ISA500Ti)

Check R118, R119, R218, and R219.

Excessive current draw with signal present (ISA750 and ISA800Ti)

• Check triacs Q113 and Q213.

• Check D119, D120, D219 and D220.

Possible situations:

The output signal breaks up or is distorted

• (ISA280, ISA300Ti, ISA450, and ISA500Ti) Check the hum-null resistors R118, R119, R218, and R219.

• Check the ground traces for continuity among speaker ground, input ground, and AC ground.

“Ringing” sound in loudspeaker when no audio signal is present

• Check C114, C124, C214 and C224.

• Check or replace dual op amp U101 or U201.

The output signal collapses when driving a normal speaker load

• R139, R140, R239, and/or R240 is misadjusted.

• Check R118, R119, R218, and R219.

18 QSC Audio Products, Inc.

TD-000163-00 Rev. A

3.4 Instability

3.5 Power supply & rail balancing

The customer complains of gain problems, spurious noises, or oscillations.

Symptoms covered:

• General output distortion

• “Ringing” sound in loudspeaker trailing an audio signal

• Excessive crossover distortion

• The output waveform appears fuzzy on an oscilloscope Distinguish among the different symptoms of fuzziness (instability),

ringing (momentary instability after a transition), crossover distortion (often causing ringing), or general distortion.

Possible situations:

General distortion in the output signal

• Severe distortion, at any load, often with abnormally high current draw: check the slew rate capacitors C114, C115, and C116 (Channel 1) or C214, C215, and C216 (Channel 2).

• Moderate distortion, especially with light loading: stability capacitors C124 and C126 (Channel 1) or C224 and C226 is too high in capacitance; also check the slew rate capacitors C114, C115, and C116 (Channel 1) or C214, C215, and C216 (Channel

2), and the output filter resistors R161, R162, R154, and R155 (Channel 1) or R261, R262, R254, or R255 (Channel 2).

• Distortion with low gain: check the feedback shunt components R120, R138, and C125 (Channel 1) or R220, R238, or C225 (Channel 2); also check for broken circuit traces around the components; U101 (Channel 1) or U201 (Channel 2) is defective or its socket is contaminated.

Ringing sound trailing the audio signal

• This usually indicates marginal instability and is usually triggered by the signal passing through zero volts (the crossover point). Check the stability components and output filters.

• With a sine wave test signal, use an oscilloscope to check for excessive crossover notch at the output signal’s zero crossings.

Excessive crossover distortion (unbalanced, asymmetrical, or excessively large crossover notch)

• Severe crossover discontinuity: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are shorted.

• Moderate discontinuity: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are out of spec.

• R131 (Channel 1) or R231 (Channel 2) is defective.

• Base resistors R136 or R137 (Channel 1) or R236 or R237 (Channel 2) are open. Also check the NTC thermistors R134 (Channel 1) or R234 (Channel 2).

problems

Symptoms covered:

• Insufficient or excessive current limiting into a shorted load

• Op amp rails too high with a shorted load

• Uneven voltages on supply rails A channel’s output current should remain unaffected when driving

resistive loads as low as 2 ohms per channel. When driving a short circuit, the current limiting circuit should collapse the output to a lower current. This is done by dropping the op amp’s supply rails from a normal ±14–15 volts down to about ±5–6 volts. Normally, the output signal helps replenish the op amp supply rails through D115 and D116 (Channel 1) and D215 and D216 (Channel 2), but a short circuit or excessively low load impedance prevents the replenishment, and the op amp rails collapse because they can’t supply enough current to let the op amp drive both the clip LED and the driver transistors. The current limit trimpots R139, R140, R239, and R240 permit adjustment of the current limit thresholds. See the RMX calibration section of this manual for adjustment procedures.

Possible situations:

Excessive current into short (insufficient limiting)

• If the op amp rails are dropping to ±5 to 6 volts as they should: the 5.6V zener diodes D107 and/or D110 (Channel 1) or D207 and/or D210 (Channel 2) are reversed or shorted.

• If high crossover distortion is present: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are shorted.

Excessive current into short (op amp rails are not dropping)

• The op amp U101 (Channel 1) or U201 (Channel 2) is defective, with insufficient output current.

• Clip LED LD100 (Channel 1) or LD200 (Channel 2) and/or its rectifying diodes (Channel 1: D102, D103, D105, D106; Channel 2: D202, D203, D205, D206) are open.

• When driving a short circuit, the output section’s positive and negative supply rail voltages should be equal, within 3 volts. If they aren’t, check D107, D110, R146, and R147 (Channel 1) or D207, D210, R246, and R247 (Channel 2).

Weak current into 2 limiting)

• Bias resistors R130 and R132 (Channel 1) or R230 and R232 (Channel 2) are too high.

• Driver transistors (Channel 1: Q105, Q106; Channel 2: Q205, Q206) have very low gain.

• One or more emitter resistors in the output section are open.

Current OK at 2

• LD100, D102, D103, D105, or D106 (Channel 1), or LD200, D202, D203, D205, or D206 (Channel 2), are shorted.

• Zener voltage of diodes D107 or D110 (Channel 1), or D207 or D210 (Channel 2), is too high.

ΩΩ

Ω or short (excessive or premature

ΩΩ

Ω, weak into short

ΩΩ

Technical Service Manual 19 ISA Series Power Amplifiers

Current limits properly into short, but current is weak at 2

ΩΩ

Ω

ΩΩ

• If the op amp rails are low (< 14–15 volts) when driving a 2ohm load

without

clipping, check the resistors R157 and R158 (Channel 1, all models), R198 (Channel 1, ISA750 and ISA800T only) and diodes D115 and D116 (Channel 1, all models), or R257 and R258 (Channel 2, all models), R298 (Channel 2, ISA750 and ISA800T only) and diodes D215 and D216 (Channel 2, all models).

• If the op amp rails are normal (14–15 volts) when driving a 2-ohm load

without

clipping, usually the output section gain is too low: weak driver transistors, open output transistors, or open emitter resistors. Check the value of the driver transistors’ emitter resistors, too: R146 and R147 (Channel 1) or R246 and R247 (Channel 2).

Rail voltages unequal

The balance between the positive and negative rail voltages is set by a voltage divider comprising resistors R118 and R119 (Channel

1) and R218 and R219 (Channel 2). If the amplifier channel passes a signal but clips unevenly due to unequal rail voltages, this voltage divider is the likely culprit.

Table 1: Bias and current limit adjustments

Calibrations Adjust

Channel 1 bias: DC voltage across R147

(ISA1350: across R199 of upper module)

Channel 2 bias: DC voltage across R247

(ISA1350: across R199 of lower module)

Output current into shorted load

AC current when driving shorted load*

Clipping voltage into 2 ohms (RMS)

Clipping voltage into 2 ohms (peak)

Idle AC demand* temperature; higher when hot)

*

(at ambient room

*

R131 (ISA1350: R171 of upper module)

R231 (ISA1350: R171 of lower module)

Channel 1: R139 & R140* Channel 2: R239 & R240*

Channel 1: R139 & R140* Channel 2: R239 & R240

Channel 1: Adjust R139 for symmetry* Channel 2: Adjust R239 for symmetry

Channel 1: Adjust R139 for symmetry* Channel 2: Adjust R239 for symmetry*

ISA280

ISA300T

ISA300Ti

0.14 V 0.12 V 0.07 V 0.09 V

4–4.5 A 4–5 A 8.5–9 A 4.6–5 A

3.75–4.5 A 4.5–5.5 A 5.5–6.5 A 3–3.3 A

*

26–29 V 33.5–37.5 V 44–49 V 57–63 V

*

36.8–41 V 47.4–53 V 62.2–69.3 V 80.6–89 V

±10%

0.4 A,

ISA450

ISA500T

ISA500Ti

0.4 A,

±10%

ISA750

ISA800T

ISA800Ti

0.6 A,

±10%

ISA 1350

0.6 A,

±10%

* NOTE: Except ISA1350 ** Figures shown are for 120V amplifiers; multiply current by 0.5 for 230V or by 1.2 for 100V models.

20 QSC Audio Products, Inc.

TD-000163-00 Rev. A

4. ISA calibration procedures

4.1 Setting bias

Always set the bias

• after replacing any output or driver transistor.

• after replacing any diode or resistor in the driver/output circuitry.

• if the amplifier seems to run too hot at idle.

• if the amplifier exhibits crossover distortion.

The bias network sets the quiescent base current in the NPN and PNP driver transistors, which in turn sets the quiescent current in the output transistors. The driver transistors should both be slightly “on” at idle so that the transitions of the signal voltage between positive and negative are smooth and free of gaps or glitches. Too much bias current will cause the amplifier to run hotter than it should, especially at idle, while too little will cause noticeable crossover distortion, especially at low signal levels.

The amplifier circuitry must be cool, or at least within a couple degrees of ambient air temperature, and the top cover must be removed. If the driver and output transistors are significantly warmer than the ambient air, leave the amplifier off and let it cool before proceeding.

Before turning the amplifier on to set bias on one or both channels, familiarize yourself with the locations of the trimpots (R131 and R231, or R171 of the ISA1350) and the voltage measuring points so you can work quickly but thoroughly (in all models except the ISA1350, the trimpots for the lower module are located on a small auxiliary circuit board). If the amplifier warms up before you finish setting the bias, you will need to shut the amplifier off and let it cool down before you resume.

To set bias on the ISA1350, first remove the screws holding the channel module/heat sink assembly to the chassis. Lift the assembly up from the chassis standoffs and set it down inside the chassis resting on the heat sinks. Do not disconnect any wires. This gives you equal access to both channels’ adjuments and measurement points.

Tools and resources you will need:

• Small flat screwdriver (non-conductive) for adjusting trimpots

• DC voltmeter

• AC power

Procedure

1. Turn the amplifier’s gain controls all the way down. No test

signal is needed.

2. Plug the amplifier into an appropriate AC source. Turn the

amplifier on.

3. Channel 1: Locate resistor R147 (except ISA1350: R199 on the

upper module) and trimpot R131 (except ISA1350: R171 on the upper module). While measuring the DC voltage across

resistor, adjust the trimpot to obtain the voltage listed in Table 1.

4. Channel 2: Locate resistor R247 (except ISA1350: R199 on the

lower module) and trimpot R231 (except ISA1350: R171 on the lower module). While measuring the DC voltage across resistor, adjust the trimpot to obtain the voltage listed in Table 1.

After setting the bias in any model except the ISA1350, calibrate the positive and negative current limiting; instructions for the procedure follow in part 4.2.

4.2 Setting positive and negative current limits

All models except the ISA1350 have adjustable positive and negative current limiting thresholds. To provide better access, the adjustment trimpots for the lower module are located on a small auxiliary circuit board. Current limiting in the ISA1350 is not adjustable.

Tools and resources you will need

• Oscilloscope

• 2-ohm resistive load (rated for at least 1200 watts)

• Shorting connector for amplifier output

• Variable AC transformer (e.g., Variac, Powerstat, etc.) rated for 25A (120V) or 12A (230V). Make sure the AC supply is appropriate for the amplifier.

• 1 kHz audio sine wave generator

• Digital multimeter

• Clamp-on digital current meter (e.g., Fluke 30 Clamp Meter)

• Small flat screwdriver (non-conductive) for adjusting trimpots

Procedure

1. Set the audio sine generator to 1 kHz at 1 volt RMS and

connect it to Channel 1's input. Connect a 2-ohm load and the oscilloscope probe across Channel 1's output.

2. Turn up Channel 1's gain control partway. On the oscilloscope

you should see the amplitude of the sine wave increase accordingly.

3. Turn the gain control back down and apply a short circuit

across the output terminals of Channel 1. Clamp a current probe either onto one of the brown wires running to the AC switch or onto the gray output wire from channel 1's module.

4. Turn the gain control all the way up. Adjust trimpots R139 and

R140 equally until the current measured falls within the range shown in Table 1.

5. Turn the gain control all the way down and remove the short

circuit so the channel drives the 2-ohm load. Turn the gain control

Technical Service Manual 21 ISA Series Power Amplifiers

back up until the output clips. The voltage at which the signal starts to clip should fall within the range shown in Table 1. If the clipping is asymmetrical, that is, the signal clips on either the positive or negative side first, adjust R139 to make it symmetrical.

6. Turn the gain control down. If the amp has begun to warm up

shut it off and let it cool a few minutes before proceeding with Channel 2.

7. Repeat steps 1 through 5 for Channel 2. Use trimpots R239

and R240 to adjust the current limiting in steps 11 and 12.

8. Turn both channels’ gain controls all the way down. Clamp the

ammeter onto one of the amp’s AC wires and check the amp’s idle current. If the amplifier is still at about room temperature, the idle current should match the value shown in Table 1.

22 QSC Audio Products, Inc.

TD-000163-00 Rev. A

5. Servicing ISA amplifiers

5.1 Mechanical disassembly and re-assembly

Replacing components will usually require removing the channel modules and/or AC board from the amplifier chassis, especially on the ISA280, ISA300T, ISA300Ti, ISA450, ISA500T, and ISA500Ti, which have single-side printed circuit boards. The ISA750, ISA800T, ISA800Ti, and ISA1350 have double-side boards; many of the through-hole components on the upper side of the board can be unsoldered and soldered from the top side of the board, so removing modules or boards is not always necessary.

See the fold-out assembly guides in Chapter 7 of this manual for assistance.

NOTE: The upper channel module is Channel 1 and the lower is Channel 2 Channel 1, and their upper is Channel 2.

Removing the channel modules

1. Disconnect the amplifier from AC power and allow at least 10 minutes for internal voltages to bleed down.

2. Using a Philips screwdriver, remove the screws that fasten the top cover to the chassis. Also remove the top cover’s four recessed

screws that fasten it to the heat sinks. As you remove screws, set them aside, but also make note of where each type is used so you can properly re-assemble the amplifier.

3. Lift the top cover up at the rear and carefully pull it toward the back, removing the five hooks on the front edge from their slots in the

chassis.

4. Tip the amplifier up on its side and remove the four screws that fasten the heat sink to the chassis.

5. Set the amplifier back down and remove the three screws that mount the channel module assembly to the chassis standoffs.

6. Disconnect the wire and cable connections to the channel modules. All of the connections are either detachable headers or ¼-inch

quick-connect tabs that are disconnected by pulling them straight up. No unsoldering is necessary.

7. Lift the channel module assembly out from the chassis. If you need access to the underside of the circuit boards, unscrew the

transistors and the clamps from the heat sink, then unscrew the circuit boards from the mounting plate..

8. Before reassembling the channel module assembly, lightly apply fresh heat sink compound over the old coating on the side of the

semiconductors that mount to the heat sink. Re-assembly is the opposite of disassembly.

except

in the ISA 750 and ISA 800T; their lower module is

Removing the AC board

The AC board provides AC voltage selection, rectification of the transformer secondary current, and a regulated DC supply for the cooling fan. It seldom needs to be replaced unless it is physically damaged itself. Most failures involving the AC board can be repaired through replacement of individual components.

WARNING: Regulatory and safety agencies require that any operating voltage conversions from 120 volts to any other voltage be done

or international distributor.

1. Disconnect the amplifier from AC power and allow at least 10 minutes for internal voltages to bleed down.

2. Remove the four screws that fasten the fan, fan shroud, and fan guard to the chassis. Lift the fan shroud out from the chassis.

3. Disconnect the wires that connect to the channel modules. All of the large single wires attach to the channel modules with ¼-inch

4. Remove the five screws that attach the AC board to the chassis standoffs. Lift the board out from the chassis.

5. Re-assembly is the opposite of disassembly. If you’re using a new AC board, slide new pieces of heat shrink tubing over the

Technical Service Manual 23 ISA Series Power Amplifiers

only

by QSC’s factory service. Any other operating voltage conversions may be done only by a QSC-authorized service center

quick-connect tabs that are detached by pulling them straight up. The remaining three black wires disconnect at the left channel module with a detachable header.

If you are planning to replace the AC board with another, carefully cut each of the transformer wires connecting to the board just above its solder tab. You must leave enough slack to allow connection to the new AC board. Remove the old heat shrink tubing from the wires and strip the wire ends about 0.25 inch or 6.3 mm.

transformer wires before you solder them to the appropriate tabs on the board; after soldering, cover the joints with the tubing and use a heat gun or other heat source to shrink them tightly.

6. Replacement parts

6.1 ISA280 parts and assemblies

ISA280 Power Amplifier

120V: QSC part # FG-002800-00 230V: QSC part # FG-002800-02 220V Korea: QSC part # FG-002800-03 240V UK: QSC part # FG-002800-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 TS-000004-WR 3 YEARS WARRANTY 3 Except UK WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V only except UK WC-000273-GP AC CORD 240V UK, FUSE 13A 1 UK only WP-002800-00 ISA 280 CHASSIS ASSY (120V) 1 Before May 2006 100V and 120V only WP-002800-02 ISA 280 CHASSIS ASSY (230V) 1 Before May 2006 230V only including UK WP-002800-03 ISA 280 CHAS ASSY (220V 60HZ) 1 Before May 2006 220V Korea only WP-002803-00 ISA 280 CHASSIS ASSY (120V) 1 Beginning May 2006 100V and 120V only WP-002803-02 ISA 280 CHASSIS ASSY (230V) 1 Beginning May 2006 230V only including UK WP-002803-03 ISA 280 CHAS ASSY (220V 60HZ) 1 Beginning May 2006 220V Korea only

Chassis Assembly ISA280 (beginning June 2006)

120V: QSC part # WP-002803-00 230V: QSC part # WP-002803-02 220V Korea: QSC part # WP-002803-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000129-GP FUSE T10A/125V/250V 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-000019-GP BOLT, M8 X 80MM, , , WHT ZINC, 1 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2

24 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA280 (beginning June 2006) continued

QSC Part # Description Qty. Reference Comments

SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000086-GP CIRCUIT BRKR 10AMP 1 100V and 120V only SW-000088-GP ROCKER POWER SWITCH 1 SW-000093-GP CIRCUIT BREAKER, 5 AMP, , 1 230V including UK and

WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-002801-00 MAIN PCB ASSY, ISA 280 1 Panelized assembly; see

WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only;

WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V including UK and

XF-000193-GP PWR XFMR ISA 280/300T 1

Korea only

WP-002801-00 list for individual channel modules

Panelized assembly; see WP-004502-00 list for individual channel modules

Korea only; Panelized assembly; see WP-004502-02 list for individual channel modules

Chassis Assembly ISA280 (before June 2006)

120V: QSC part # WP-002800-00 230V: QSC part # WP-002800-02 220V Korea: QSC part # WP-002800-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000129-GP FUSE T10A/125V/250V 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2

Technical Service Manual 25 ISA Series Power Amplifiers

Chassis Assembly ISA280 (before May 2006) continued

QSC Part # Description Qty. Reference Comments

SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000086-GP CIRCUIT BRKR 10AMP 1 100V and 120V only SW-000088-GP ROCKER POWER SWITCH 1 SW-000093-GP CIRCUIT BREAKER, 5 AMP, , 1 230V only including UK

WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000076-00 SRV - XFMR MOUNTING ASSY 1 WP-002801-00 MAIN PCB ASSY, ISA 280 1 Panelized assembly; see

WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only;

WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V including Korea

XF-000193-GP PWR XFMR ISA 280/300T 1

and Korea only

WP-002801-00 list for individual channel modules

Panelized assembly; see WP-004502-00 list for individual channel modules

and UK only; Panelized assembly; see WP-004502-02 list for individual channel modules

Main PCB Assembly ISA280

QSC part # WP-002801-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ040C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ040C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-382001-GP 0.082U, 5%, 63V, CM, , RBT, 7.5 2 C109, C209 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-415004-GP 0.15U, 5%, 63V, CM, , RBT, 7.5X 2 C108, C208 CA-422006-GP CM 50V .22UF 5% RL 2 C107, C207

26 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA280 continued

QSC Part # Description Qty. Reference Comments

CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-847001-GP CE 80V 4700UF 20% RL 25X 4 C120, C121, C220, C221 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1 CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 14 E9–E12, E100, E101, E112, E200, E201, E212, E226–E229 CO-000222-GP 8-PIN IC SOCKET 2 U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 REF: LD1A, LD100A, LD200A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 35 D2–D7, D9, D14, D16–18, D102–D106, D111–D116, D119, D202–D206,

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q6, Q7, Q100, Q200, Q13 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 6 Q103, Q107, Q109, Q203, Q207, Q209 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 6 Q108, Q110, Q112, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 12 R142, R148, R149, R152, R153, R159, R242, R248, R249, R252, R253,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211

D211–D216, D219

R259

Technical Service Manual 27 ISA Series Power Amplifiers

Main PCB Assembly ISA280 continued

QSC Part # Description Qty. Reference Comments

RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R115, R130, R132, R215, R230, R232 RE-082005-GP RMF 5W 820 OHM 5% AL METAL 4 R157, R158, R257, R258 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-088701-GP RMG 1/10W 887 OHM 1% 0805 1 R50 RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-120007-GP RMF 5W 2K 5% AL METAL 4 R133, R135, R233, R235 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263 RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-190903-GP RMF 1/2W 9.09K 1% AT 1 R123 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201,

RE-210010-GP RMF 1/2W 10.0K 1% AT 2 R122, R222 RE-213304-GP RMF 1/2W 13.3K 1% AT 2 R145, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-352301-GP 523K, 1 PCNT, 1/4W, RMG, 1206, 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R203, R205, R206, R228

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 This assembly is a panelized construction comprising the AC, input, and channel 2 bias adjust board assemblies, built on a common perforated circuit board. For the AC board assembly, order PCB-QZ040C-PSU; for the input board, order PCB-QZ040C-INP; and for the channel 2 bias adjust module, order PCB-QZ040C-BIAS.

QSC Part # Description Qty. Reference Comments

CA-122005-GP CC 50V 220PF 5% 0805 4 C1–C4 CA-422005-GP CM 250V .22UF 10% RL 2 C127, C227 CA-810006-GP 1000UF 35V 20% ELECTROLYTIC 1 C6 CH-000170-GP BRACKET AC PCB MTG 2 CO-000204-GP CONN XLR F VERT PLASTIC 2 J101, J201 CO-000212-GP TERMINAL WRAP 16 E1–E8, J2A–J9A CO-000213-GP CONN 2 PIN STRAIGHT WAFER 1 J18 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 1 J21 CO-000224-GP CONN 6 PIN ST. WAFER 1 J400

28 QSC Audio Products, Inc.

TD-000163-00 Rev. A

PCB Assembly, AC/Input ISA continued

QSC Part # Description Qty. Reference Comments

CO-000225-GP CONN 5-PIN WAFER P2.5 1 J430 CO-000314-GP CONN 26 PIN DUAL ROW W/LCK EAR 1 HW-000020-GP FUSE HOLDER 6.3MM 2 F100, F200 IC-000213-GP IC 4N29 1U2 MS-000125-GP HEATSINK FOR RECTIFIER 2 BR100, BR200 MS-000126-GP HEATSINK, BRIDGE RECTIFIER 1 REF: Q3 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030001-GP WASHER M3.0 X 0.4 X 8 BZ 1 NW-032000-GP WASHER NYLON ID 3.2MM 1 PC-004502-00 SRV - PCB, AC/INPUT/TRIMMER ISA SER 1 QD-000200-GP DIODE RECT 1A 200V DB103 1 BR1 QD-000214-GP TR TIP31C SAMSUNG 1 Q3 QD-000227-GP BRIDGE RECT 400V 25A 2 BR100, BR200 RE-000005-GP POLYSWITCH 1.1A 0.15 OHM 1.5W 1 R1 RE-000270-GP NTC 30A 1 OHM 1 R21 RE-010009-GP 100 OHM POT PCB MOUNT 1 R231 RE-012003-GP RMF 3W 120 OHM 5% AL METAL 1 R17 RE-120003-GP RCF 1/8W 2K 5% ATS 1 R13 RE-122006-GP SVR 2.2K H3 7X7 2 R239, R240 RE-168002-GP RCF 1/8W 6.8K 5% ATS 2 R9, R14 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R12 SC-030006-GP M3 X 14MM BZ CR BH 1 SC-030007-GP M3 X 6MM B-TITE BLK ZN 1 SW-000089-GP 10 POLE DIP SWITCH 1 SW1 WC-000176-GP UL1015 #16 2P BLK L=300 2 E14, E16 WC-000178-GP CONN ASSY RED W/TRND 2 E13, E15 WC-000185-GP WIRE 1015 BLUE #14 1 JP10 WC-000186-GP WIRE 1015 BROWN #14 1 JP12 WC-000328-GP CABLE ASSY, 26 PIN RIBBON HDR 1

Technical Service Manual 29 ISA Series Power Amplifiers

6.2 ISA300T parts and assemblies

ISA 300T Power Amplifier

120V: QSC part # FG-000305-00 230V: QSC part # FG-000305-02 220V Korea: QSC part # FG-000305-03 240V UK: QSC part # FG-000305-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 WC-000213-GP AC CORD 1 WC-000273-GP AC CORD 240V UK, FUSE 13A 1 WP-000305-00 ISA 300T CHASSIS ASSY (120V) 1 WP-000305-02 ISA 300T CHASSIS ASSY (230V) 1 WP-000305-03 ISA 300T CHAS ASSY (220V 60HZ) 1

Chassis Assembly ISA300T

120V: QSC part # WP-000305-00 230V: QSC part # WP-000305-02 220V Korea: QSC part # WP-000305-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000371-GP LABEL, CE, , , 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000129-GP FUSE T10A/125V/250V 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000086-GP CIRCUIT BRKR 10AMP 1 100V and 120V only

30 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA300T continued

QSC Part # Description Qty. Reference Comments

SW-000088-GP ROCKER POWER SWITCH 1 SW-000093-GP CIRCUIT BREAKER, 5 AMP, , 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000069-00 SRV - XFMR MNTG ASSY ISA300/500/800T 2 WP-000076-00 SRV - XFMR MOUNTING ASSY 1 WP-000306-00 MAIN PCB ASSY, ISA 300T 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V only XF-000191-GP LINE XFMR ISA 300T 2 XF-000193-GP PWR XFMR ISA 280/300T 1

Main PCB Assembly ISA300T

QSC part # WP-000306-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ070C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ070C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-410015-GP CM 50V .1UF 5% RL 6 C107–C109, C207–C209 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-847001-GP CE 80V 4700UF 20% RL 25X 4 C120, C121, C220, C221 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1 CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348

Technical Service Manual 31 ISA Series Power Amplifiers

Main PCB Assembly ISA300T continued

QSC Part # Description Qty. Reference Comments

CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 10 E9–E12, E100, E101, E112, E200, E201, E212 CO-000222-GP 8-PIN IC SOCKET 2 U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 LD1A, LD100A, LD200A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 36 D2–D7, D9, D14, D16–D18, D20, D102–D106, D111–D116, D119, D202–

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q5, Q7, Q13, Q100, Q200 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 6 Q103, Q107, Q109, Q203, Q207, Q209 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 6 Q108, Q110, Q112, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 12 R142, R148, R149, R152, R153, R159, R242, R248, R249, R252, R253,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211 RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R115, R130, R132, R215, R230, R232 RE-082005-GP RMF 5W 820 OHM 5% AL METAL 4 R157, R158, R257, R258 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-088701-GP RMG 1/10W 887 OHM 1% 0805 1 R50 RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-120007-GP RMF 5W 2K 5% AL METAL 4 R133, R135, R233, R235 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263

D206, D211–D216, D219

R259

32 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA300T continued

QSC Part # Description Qty. Reference Comments

RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-190903-GP RMF 1/2W 9.09K 1% AT 1 R123 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201,

RE-210010-GP RMF 1/2W 10.0K 1% AT 2 R122, R222 RE-213304-GP RMF 1/2W 13.3K 1% AT 2 R145, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-352001-GP RMG 1/8W 520K 1% 1206 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R203, R205, R206, R228

PCB Assembly, AC/Input ISA280 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 28.

Technical Service Manual 33 ISA Series Power Amplifiers

6.3 ISA300Ti parts and assemblies

ISA300Ti Power Amplifier

120V: QSC part # FG-000325-00 230V: QSC part # FG-000325-02 220V Korea: QSC part # FG-000325-03 240V UK: QSC part # FG-000325-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 100V and 120V only TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V only except UK WC-000273-GP AC CORD 240V UK, FUSE 13A 1 UK only WP-000325-00 ISA 300TI CHASSIS ASSY (120V) 1 100V and 120V only WP-000325-02 ISA 300TI CHASSIS ASSY (230V) 1 230V only except Korea WP-000325-03 ISA 300TI CHAS ASSY (220V 60HZ) 1 Korea only

Chassis Assembly ISA300Ti (beginning June 2006)

120V: QSC part # WP-000325-00 230V: QSC part # WP-000325-02 220V Korea: QSC part # WP-000325-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000371-GP LABEL, CE, , , 1 230V only LB-000410-GP LABEL “UL LISTED” 1 100V and 120V only LB-000449-GP LABEL, REAR, , ISATI, 0 LB-000450-GP LABEL, FRONT, , ISA 300TI, 0 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000129-GP FUSE T10A/125V/250V 2 MS-000131-GP FAN GUARD, BLACK 1 NW-000036-GP NUT, HEX M6, , , 2 NW-000037-GP WASHER, LOCK M6, , , 2 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 NW-080003-GP NUT M8X13MM 6.5MM THK STL WHT 1 NW-080004-GP LOCK WASHER M8 SPLIT ID 8.5MM 1 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-000019-GP BOLT, M8 X 80MM, , , WHT ZINC, 1

34 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA300Ti (beginning June 2006) continued

QSC Part # Description Qty. Reference Comments

SC-000021-GP BOLT, M6 X 55MM, , , WHT ZINC, 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000086-GP CIRCUIT BRKR 10AMP 1 SW-000088-GP ROCKER POWER SWITCH 1 SW-000093-GP CIRCUIT BREAKER, 5 AMP, , 1 WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 0.12 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000326-00 MAIN PCB ASSY, ISA 300TI 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V only XF-000193-GP PWR XFMR ISA 280/300T 1 XF-000268-GP LINE ISA XFMR ISA 300TI 2

Chassis Assembly ISA300Ti (before June 2006)

120V: QSC part # WP-000325-00 230V: QSC part # WP-000325-02 220V Korea: QSC part # WP-000325-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 100V and 120V only LB-000371-GP LABEL, CE, , , 1 230V only LB-000449-GP LABEL, REAR, , ISATI, 0 LB-000450-GP LABEL, FRONT, , ISA 300TI, 0 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000129-GP FUSE T10A/125V/250V 2 MS-000131-GP FAN GUARD, BLACK 1 NW-000036-GP NUT, HEX M6, , , 2 NW-000037-GP WASHER, LOCK M6, , , 2 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 NW-080003-GP NUT M8X13MM 6.5MM THK STL WHT 1 NW-080004-GP LOCK WASHER M8 SPLIT ID 8.5MM 1 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4

Technical Service Manual 35 ISA Series Power Amplifiers

Chassis Assembly ISA300Ti (beginning June 2006) continued

QSC Part # Description Qty. Reference Comments

SC-000019-GP BOLT, M8 X 80MM, , , WHT ZINC, 1 SC-000021-GP BOLT, M6 X 55MM, , , WHT ZINC, 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000086-GP CIRCUIT BRKR 10AMP 1 100V and 120V only SW-000088-GP ROCKER POWER SWITCH 1 SW-000093-GP CIRCUIT BREAKER, 5 AMP, , 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 0.12 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000326-00 MAIN PCB ASSY, ISA 300TI 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V only XF-000193-GP PWR XFMR ISA 280/300T 1 XF-000268-GP LINE ISA XFMR ISA 300TI 2

Main PCB Assembly ISA300Ti

QSC part # WP-000326-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ070C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ070C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C210, C110 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-410015-GP CM 50V .1UF 5% RL 6 C107–C109, C207–C209 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-847001-GP CE 80V 4700UF 20% RL 25X 4 C120, C121, C220, C221 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2

36 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA300Ti continued

QSC Part # Description Qty. Reference Comments

CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1 CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 10 E9–E12, E100, E101, E112, E200, E201, E212 CO-000222-GP 8-PIN IC SOCKET 2 REF: U101,201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 REF: LD1A, LD100A, LD200A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 36 D2–D7, D9, D14, D16, D17, D18, D20, D102–D106, D111–D116, D119,

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q5, Q7, Q13, Q100, Q200 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 6 Q103, Q107, Q109, Q203, Q207, Q209 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 6 Q108, Q110, Q112, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 12 R142, R148, R149, R152, R153, R159, R242, R248, R249, R252, R253,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211 RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R115, R130, R132, R215, R230, R232 RE-082005-GP RMF 5W 820 OHM 5% AL METAL 4 R157, R158, R257, R258 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-088701-GP RMG 1/10W 887 OHM 1% 0805 1 R50

D202–D206, D211–D216, D219

R259

Technical Service Manual 37 ISA Series Power Amplifiers

Main PCB Assembly ISA300Ti continued

QSC Part # Description Qty. Reference Comments

RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-120007-GP RMF 5W 2K 5% AL METAL 4 R133, R135, R233, R235 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263 RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-190903-GP RMF 1/2W 9.09K 1% AT 1 R123 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28, R29, R30, R31, R53, R100, R101, R103, R105, R106, R128, R200,

RE-210010-GP RMF 1/2W 10.0K 1% AT 2 R122, R222 RE-213304-GP RMF 1/2W 13.3K 1% AT 2 R145, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-352301-GP 523K, 1 PCNT, 1/4W, RMG, 1206, 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R201, R205, R206, R203, R228

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

38 QSC Audio Products, Inc.

TD-000163-00 Rev. A

6.4 ISA450 parts and assemblies

ISA450 Power Amplifier

120V: QSC part # FG-004500-00 230V: QSC part # FG-004500-02 220V Korea: QSC part # FG-004500-03 240V UK: QSC part # FG-004500-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 120V only TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V only WC-000273-GP AC CORD 240V UK, FUSE 13A 1 240V UK only WP-004500-00 ISA 450 CHASSIS ASSY (120V) 1 Before May 2006 100V and 120V only WP-004500-02 ISA 450 CHASSIS ASSY (230V) 1 Before May 2006 230V only WP-004500-03 ISA 450 CHAS ASSY (220V 60HZ) 1 Before May 2006 220V Korea only WP-004503-00 ISA 450 CHASSIS ASSY (120V) 1 Beginning May 2006 100V and 120V only WP-004503-02 ISA 450 CHASSIS ASSY (230V) 1 Beginning May 2006 230V only WP-004503-03 ISA 450 CHAS ASSY (220V 60HZ) 1 Beginning May 2006 220V Korea only

Chassis Assembly ISA450 (beginning June 2006)

120V: QSC part # WP-004503-00 230V: QSC part # WP-004503-02 220V Korea: QSC part # WP-004503-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000124-GP FUSE 12A 250V 6.3 X 32MM 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-000019-GP BOLT, M8 X 80MM, , , WHT ZINC, 1 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2

Technical Service Manual 39 ISA Series Power Amplifiers

Chassis Assembly ISA450 (beginning June 2006) continued

QSC Part # Description Qty. Reference Comments

SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only SW-000094-GP CIRCUIT BREAKER 8A 1 230V including UK and

WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-004501-00 MAIN PCB ASSY, ISA 450 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V including UK and

XF-000189-GP PWR XFMR ISA450/500T 1

Korea only

Chassis Assembly ISA450 (before May 2006)

120V: QSC part # WP-004500-00 230V: QSC part # WP-004500-02 220V Korea: QSC part # WP-004500-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000124-GP FUSE 12A 250V 6.3 X 32MM 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1

40 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA450 (before June 2006) continued

QSC Part # Description Qty. Reference Comments

WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000076-00 SRV - XFMR MOUNTING ASSY 1 WP-004501-00 MAIN PCB ASSY, ISA 450 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V including UK and

XF-000189-GP PWR XFMR ISA450/500T 1

Korea only

Main PCB Assembly ISA450

QSC part # WP-004501-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-410023-GP 0.1UF, 5%, 63V, CM, , RBT, 7.5X6 1 C130 CA-415004-GP 0.15U, 5%, 63V, CM, , RBT, 7.5X 4 C108, C109, C208, C209 CA-422006-GP CM 50V .22UF 5% RL 2 C107, C207 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-833002-GP 3300UF 20% 100V ELECT RAD 8 C120–C123, C220–C223 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1 CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 14 E9–E12, E100, E101, E112, E200, E201, E212, E226–E229 CO-000222-GP 8-PIN IC SOCKET 2 U101, U201

Technical Service Manual 41 ISA Series Power Amplifiers

Main PCB Assembly ISA450 continued

QSC Part # Description Qty. Reference Comments

CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 REF: LD1A, LD100A, LD200A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 35 D2–D7, D9, D14, D16–D18, D102–D106, D111–D116, D119, D202–D206,

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q6, Q7, Q13, Q100, Q200 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211 RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R115, R130, R132, R215, R230, R232 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-097601-GP RMG 1/10W 976 OHM 1% 0805 1 R50 RE-110011-GP RMF 5W 1K 5% 5 R32, R157, R158, R257, R258 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130003-GP RMF 5W 3K 5% METAL 4 R133, R135, R233, R235 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263 RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201,

RE-211304-GP RMF 1/2W 11.3K 1% AT 1 R123 RE-213304-GP RMF 1/2W 13.3K 1% AT 4 R122, R145, R222, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5

D211–D216, D219

R249, R252, R253, R256, R259

R203, R205, R206, R228

42 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA450 continued

QSC Part # Description Qty. Reference Comments

RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-368001-GP RMG 1/8W 680K 1% 1206 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

Technical Service Manual 43 ISA Series Power Amplifiers

6.5 ISA500T parts and assemblies

ISA 500T Power Amplifier

120V: QSC part # FG-000505-00 230V: QSC part # FG-000505-02 220V Korea: QSC part # FG-000505-03 240V UK: QSC part # FG-000505-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 WC-000213-GP AC CORD 1 WC-000273-GP AC CORD 240V UK, FUSE 13A 1 WP-000505-00 ISA 500T CHASSIS ASSY (120V) 1 WP-000505-02 ISA 500T CHASSIS ASSY (230V) 1 WP-000505-03 ISA 500T CHAS ASSY (220V 60HZ) 1

Chassis Assembly ISA 500T

120V: QSC part # WP-000505-00 230V: QSC part # WP-000505-02 220V Korea: QSC part # WP-000505-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000371-GP LABEL, CE, , , 1 230V only LB-000410-GP LABEL “UL LISTED” 1 100V and 120V only LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000124-GP FUSE 12A 250V 6.3 X 32MM 2 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1

44 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA500T continued

QSC Part # Description Qty. Reference Comments

SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only SW-000094-GP CIRCUIT BREAKER 8A 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000069-00 SRV - XFMR MNTG ASSY ISA300/500/800T 2 WP-000076-00 SRV - XFMR MOUNTING ASSY 1 WP-000506-00 MAIN PCB ASSY, ISA 500T 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V only XF-000189-GP PWR XFMR ISA450/500T 1 XF-000225-GP LINE XFMR ISA 500T 2

Main PCB Assembly ISA 500T

QSC part # WP-004501-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-410015-GP CM 50V .1UF 5% RL 6 C107–109, C207–C209 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-833002-GP 3300UF 20% 100V ELECT RAD 8 C120–C123, C220–C223 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1 CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348

Technical Service Manual 45 ISA Series Power Amplifiers

Main PCB Assembly ISA500T continued

QSC Part # Description Qty. Reference Comments

CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 14 E9–E12, E100, E101, E112, E200, E201, E212, E226–E229 CO-000222-GP 8-PIN IC SOCKET 2 U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 LD1A, LD100A, LD200A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 36 D104, D111, D112, D113, D114, D115, D116, D14, D16, D17, D18, D2,

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q6, Q7, Q13, Q100, Q200 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211 RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R130, R132, R115, R215, R230, R232 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-097601-GP RMG 1/10W 976 OHM 1% 0805 1 R50 RE-110011-GP RMF 5W 1K 5% 5 R32, R157, R158, R257, R258 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130003-GP RMF 5W 3K 5% METAL 4 R133, R135, R233, R235 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263

D3, D4, D5, D6, D7, D9, D102, D103, D105, D106, D119, D202, D203, D204, D205, D206, D211, D212, D213, D214, D215, D216, D219, D20

R249, R252, R253, R256, R259

46 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA500T continued

QSC Part # Description Qty. Reference Comments

RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201,

RE-211304-GP RMF 1/2W 11.3K 1% AT 1 R123 RE-213304-GP RMF 1/2W 13.3K 1% AT 4 R122, R145, R222, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-368001-GP RMG 1/8W 680K 1% 1206 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R203, R205, R206, R228

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

Technical Service Manual 47 ISA Series Power Amplifiers

6.6 ISA500Ti parts and assemblies

ISA500Ti Power Amplifier

120V: QSC part # FG-000525-00 230V: QSC part # FG-000525-02 220V Korea: QSC part # FG-000525-03 240V UK: QSC part # FG-000525-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 WC-000213-GP AC CORD 1 WC-000273-GP AC CORD 240V UK, FUSE 13A 1 WP-000525-00 ISA 500TI CHASSIS ASSY (120V) 1 WP-000525-02 ISA 500TI CHASSIS ASSY (230V) 1 ? WP-000525-03 ISA 500TI CHAS ASSY (220V 60HZ) 1 ?

Chassis Assembly ISA500Ti

120V: QSC part # WP-000525-00 230V: QSC part # WP-000525-02 220V Korea: QSC part # WP-000525-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000371-GP LABEL, CE, , , 1 LB-000449-GP LABEL, REAR, , ISATI, 0 LB-000451-GP LABEL, FRONT, , ISA 500TI, 0 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000124-GP FUSE 12A 250V 6.3 X 32MM 2 MS-000131-GP FAN GUARD, BLACK 1 NW-000036-GP NUT, HEX M6, , , 2 NW-000037-GP WASHER, LOCK M6, , , 2 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 NW-080003-GP NUT M8X13MM 6.5MM THK STL WHT 1 NW-080004-GP LOCK WASHER M8 SPLIT ID 8.5MM 1 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-000019-GP BOLT, M8 X 80MM, , , WHT ZINC, 1 SC-000021-GP BOLT, M6 X 55MM, , , WHT ZINC, 2

48 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA500Ti continued

QSC Part # Description Qty. Reference Comments

SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only SW-000094-GP CIRCUIT BREAKER 8A 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 0.12 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000526-00 MAIN PCB ASSY, ISA 500TI 1 WP-004502-00 PCB ASSY, AC/INPUT ISA (120V) 1 100V and 120V only WP-004502-02 PCB ASSY, AC/INPUT, ISA, 230V, 1 230V only XF-000189-GP PWR XFMR ISA450/500T 1 XF-000269-GP LINE ISA XFMR ISA 500TI 2

Main PCB Assembly ISA500Ti

QSC part # WP-000526-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one on top), order PCB-QZ050C-PWR1; for the channel 2 module (the one underneath), order PCB-QZ050C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-056002-GP CTC 200V 56PF 5% 1206 2 C111, C211 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-210011-GP 0.001UF 5% 100V CER X7R 1206 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C126, C215, C226 CA-233004-GP CM 50V .0033UF 5% RL 4 C117, C118, C217, C218 CA-310009-GP CC 50V .01UF 20% 0805 1 C5 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C125, C225 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C124, C224 CA-410013-GP CER 2 1206 10% 50V .1UF 3 C100, C102, C104 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 1 C11 CA-410015-GP CM 50V .1UF 5% RL 6 C107–C109, C207–C209 CA-410023-GP 0.1UF, 5%, 63V, CM, , RBT, 7.5X6 1 C130 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-647006-GP CE 16NP 47UF 20% RL 2 C106, C206 CA-710009-GP CE 25V 100UF 20% RL 2 C105, C205 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-833002-GP 3300UF 20% 100V ELECT RAD 8 C120–C123, C220–C223 CH-000164-GP HEATSINK ISA280/450 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 1 CH-000172-GP CLAMP TRANSISTOR 1

Technical Service Manual 49 ISA Series Power Amplifiers

Main PCB Assembly ISA500Ti continued

QSC Part # Description Qty. Reference Comments

CO-000205-GP HEADER 6-PIN RT ANGLE 1 J421 CO-000209-GP HEADER 3-PIN RIGHT ANGLE 2 J401, J402 CO-000210-GP HEADER 4-PIN RIGHT ANGLE 2 J422, J423 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J337, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 3 J157, J309, J310 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 2 J345, J348 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J297, J424 CO-000217-GP CONN 13 PIN STRAIGHT WAFER 2 J104, J204 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 14 E9–E12, E100, E101, E112, E200, E201, E212, E226–E229 CO-000222-GP 8-PIN IC SOCKET 2 REF: U101,201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 PC-004501-00 SRV - MAIN PCB, ISA 3 SPACE 1 PL-000150-GP LED HOLDER 3 REF: LD100A,200A,1A PL-000154-GP INSULATION SHEET IC ISA 5 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 5 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 36 D2–D7, D9, D14, D16–D18, D20, D102–D106, D111–D116, D119, D202–

QD-000202-GP DIODE 1N4004 AL 9 D1, D10–D13, D117, D118, D217, D218 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 9 Q5, Q8, Q9, Q11, Q12, Q101, Q102, Q201, Q202 QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 6 Q4, Q6, Q7, Q13, Q100, Q200 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000252-GP DIODE ZENER .25W 4.7V 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-.68001-GP RMF 1W 6.8 OHM 5% 5 R20, R146, R147, R246, R247 RE-000003-GP RMG 1/10W 0 OHM 5% 0805 2 R265, R266 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 R53 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001201-GP 12 5% 5W METAL OXIDE FILM 4 R161, R162, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 3 R25, R124, R224 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 2 R127, R227 RE-010002-30 100, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 1 R211 RE-010006-GP RMG 1/10W 100 5% 3 R109, R110, R209 RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-027003-GP RMG 1/10W 270 OHM 5% 4 R111, R113, R210, R213 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 6 R115, R130, R132, R215, R230, R232 RE-082501-GP RMG 1/8W 825 OHM 5% 1206 2 R144, R244 RE-097601-GP RMG 1/10W 976 OHM 1% 0805 1 R50 RE-110011-GP RMF 5W 1K 5% 5 R32, R157, R158, R257, R258 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 3 R19, R114A, R214A

D206, D211–D216, D219

R249, R252, R253, R256, R259

50 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA500Ti continued

QSC Part # Description Qty. Reference Comments

RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120004-GP RMG 1/10W 2K 1% 0805 3 R8, R11, R16 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-130003-GP RMF 5W 3K 5% METAL 4 R133, R135, R233, R235 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R163, R263 RE-133007-GP RMG 1/10W 3.3K 5% 0805 3 R24, R164, R264 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-210007-GP 10K 1% 1/10W THK FLM 0805 17 R28–R31, R53, R100, R101, R103, R105, R106, R128, R200, R201,

RE-211304-GP RMF 1/2W 11.3K 1% AT 1 R123 RE-213304-GP RMF 1/2W 13.3K 1% AT 4 R122, R145, R222, R245 RE-215006-GP RMF 2W 15K 5% AL METAL 2 R2, R5 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 5 R19, R117, R121, R217, R221 RE-233001-GP RMG 1/8W 33K 1% 1206 2 R22, R23 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-268002-GP RMG 1/8W 68K 5% 1206 1 R33 RE-315003-GP RMG 1/8W 150K 5% 1206 3 R10, R104, R204 RE-315004-GP RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R27 RE-322002-GP RMG 1/10W 220K 5% 0805 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R18 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R15 RE-368001-GP RMG 1/8W 680K 1% 1206 2 R116, R216 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 9 SC-030010-GP SCREW M3X0.5X12MM, B/H, BLK ZN 8 WC-000209-GP CABLE ASSY, 5 PIN 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R203, R205, R206, R228

PCB Assembly, AC/Input ISA280, 300Ti, 300T, 450, 500Ti, & 500T

120V: QSC part # WP-004502-00 230V: QSC part # WP-004502-02 See parts listing on pages 28 and 29.

Technical Service Manual 51 ISA Series Power Amplifiers

6.7 ISA750 parts and assemblies

ISA750 Power Amplifier

120V: QSC part # FG-007500-00 230V: QSC part # FG-007500-02 220V Korea: QSC part # FG-007500-03 240V UK: QSC part # FG-007500-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 100V and 120V only TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V only except UK WC-000273-GP AC CORD 240V UK, FUSE 13A 1 UK only WP-007500-00 ISA 750 CHASSIS ASSY (120V) 1 100V and 120V only WP-007500-02 ISA 750 CHASSIS ASSY (230V) 1 230V only including UK WP-007500-03 ISA 750 CHAS ASSY (220V 60HZ) 1 220V Korea only WP-007503-00 ISA 750 CHASSIS ASSY (120V) 1 100V and 120V only WP-007503-02 ISA 750 CHASSIS ASSY (230V) 1 230V only including UK WP-007503-03 ISA 750 CHAS ASSY (220V 60HZ) 1 220V Korea only

Chassis Assembly ISA750 (beginning May 2006)

120V: QSC part # WP-007503-00 230V: QSC part # WP-007503-02 220V Korea: QSC part # WP-007503-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-000018-GP BOLT, PHILLIPS, , , , 1 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP

52 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA750 (beginning May 2006) continued

QSC Part # Description Qty. Reference Comments

SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000197-GP CONN ASSY 4-PIN P=2.5 L=100 1 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-007501-00 PCB ASSY, ISA 750 1 WP-007502-00 PCB ASSY, AC/INPUT ISA750(120V) 1 WP-007502-02 PCB ASSY, AC/INPUT, ISA750, 230V, 1 XF-000192-GP PWR XFMR ISA800T/750 1

Chassis Assembly ISA750 (before May 2006)

120V: QSC part # WP-007500-00 230V: QSC part # WP-007500-02 220V Korea: QSC part # WP-007500-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000178-GP PROTECT COVER 1 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 LB-000355-GP LABEL, GROUND 1 LB-000410-GP LABEL “UL LISTED” 1 LB-000449-GP LABEL, REAR, , ISATI, 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000131-GP FAN GUARD, BLACK 1 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only SW-000094-GP CIRCUIT BREAKER 8A 1 230V including UK and

WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2

Korea

Technical Service Manual 53 ISA Series Power Amplifiers

Chassis Assembly ISA750 (before May 2006) continued

QSC Part # Description Qty. Reference Comments

WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000197-GP CONN ASSY 4-PIN P=2.5 L=100 1 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000068-00 SRV - XFMR MNTG ASSY ISA SERIES 1 **** WP-007501-00 PCB ASSY, ISA 750 1 WP-007502-00 PCB ASSY, AC/INPUT ISA750(120V) 1 WP-007502-02 PCB ASSY, AC/INPUT, ISA750, 230V, 1 XF-000192-GP PWR XFMR ISA800T/750 1

Main PCB Assembly ISA750

QSC part # WP-007501-00 This assembly is a panelized construction comprising the two channel modules, built on a common perforated circuit board. For the channel 1 module (the one underneath, order PCB-QZ060C-PWR1; for the channel 2 module (the one on top), order PCB-QZ060C-

PWR2.

QSC Part # Description Qty. Reference Comments

CA-027003-GP CTC 200V 27PF 5% 1206 2 C111, C211 CA-047005-GP CC 50V 47PF 5% 0805 6 C170, C176, C177, C270, C276, C277 CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-110004-GP CC 50V 100PF 10% 0805 2 C9, C132 CA-110005-GP CC 50V 100PF 5% 0805 1.2 1 C130 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-210012-GP CM 100V .001UF 5% RL 5X 2 C131, C231 CA-215004-GP CM 250V .0015UF 5% RL 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C117, C215, C217 CA-233004-GP CM 50V .0033UF 5% RL 4 C172, C179, C272, C279 CA-310009-GP CC 50V .01UF 20% 0805 3 C5, C181, C281 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C133, C233 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 4 C124, C126, C224, C226 CA-382001-GP 0.082U, 5%, 63V, CM, , RBT, 7.5 2 C109, C209 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 2 C11, C104 CA-410016-GP CC 50V .1UF 10% 1206 2 C178, C278 CA-410018-GP CM 250V .1UF 5% RL 4 C174, C175, C274, C275 CA-415004-GP 0.15U, 5%, 63V, CM, , RBT, 7.5X 2 C108, C208 CA-422006-GP CM 50V .22UF 5% RL 2 C107, C207 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-610009-GP CE 35V 10UF 20% RL 5 X 11 2 C171, C271 CA-622007-GP CE 25NP 22UF 20% RL 5X11 2 C129, C229 CA-647000-GP 47UF 16V 20% ELECTROLYTIC RL 3 C8, C103, C206 CA-710009-GP CE 25V 100UF 20% RL 6 C105, C173, C180, C205, C273, C280 CA-710010-GP CE 16NP 100UF 20% RL 8X11 2 C125, C225 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-912001-GP 12000UF, 20 PCNT, 63V, RL, , 8 C120–C123, C220–C223 CH-000163-GP HEATSINK ISA 750 3 SP 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 2 CH-000172-GP CLAMP TRANSISTOR 8 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J207, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 5 J108, J208, J257, J401, J402 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 6 J105, J106, J205, J206, J422, J423 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J258, J424 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 18 E100, E100A, E101, E112–E117, E117A, E200, E201, E212–E217

54 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA750 continued

QSC Part # Description Qty. Reference Comments

CO-000222-GP 8-PIN IC SOCKET 2 U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 CO-000224-GP CONN 6 PIN ST. WAFER 1 J421 CO-000226-GP CONN 13-PIN WAFER 2.0 2 J104, J204 HW-000020-GP FUSE HOLDER 6.3MM 4 F100, F200 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 IC-000214-GP LM311M VOLTAGE 4 U170, U171, U270, U271 MS-000127-GP FUSE T20A 125V 6.4 X 32MM 2 PC-007501-00 SRV - MAIN PCB, ISA 750/800T 1 PL-000150-GP LED HOLDER 4 REF: LD1, LD100A, LD200A PL-000155-GP INSULATION SILICON FOR TO-220 2 PL-000156-GP RUBBER FEET 1 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 43 D2, D9, D14, D16–D19, D102–D106, D111–D116, D121, D171, D173,

QD-000202-GP DIODE 1N4004 AL 6 D1, D10–D13 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 17 Q5, Q8, Q9, Q11, Q12, Q16–Q18, Q101, Q102, Q171, Q173, Q201, Q202,

QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 12 Q4, Q6, Q7, Q13–Q15, Q100, Q172, Q175, Q200, Q272, Q275 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 Q108, Q109, Q208, Q209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000215-GP DIODE MUR1520 15A 200V 4 D175, D176, D275, D276 QD-000216-GP THYRISTOR 200V 0.1W 2N5064 2 D219, D220 QD-000217-GP DIODE, 400V, 3A, IN5404, DO-201AD 4 D117, D118, D217, D218 QD-000218-GP DIOD ZNR 3.8-4.0V 1/2 HZ SER 2 D170, D270 QD-000219-GP DIODE ZENER 1.3W 10V TEMIC 2 D174, D274 QD-000220-GP DIODE ZENER 1W 12V AT TEMIC 2 D178, D278 QD-000221-GP TRIAC 600V 40A MAC224 A8 2 Q113, Q213 QD-000222-GP TR RFP50N06 N-CH PWR 4 Q170, Q174, Q270, Q274 QD-000223-GP TR 2N5064 TRIODE 2 D119, D120 QD-000269-GP DIODE ZENER 5.1V 5% .25W DO-35 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.15003-GP 1.5 OHM 5% 2W THK FLM 4 R181, R182, R281, R282 RE-.33001-GP RMF 1W 3.3 OHM 5% 5 R20, R146, R147, R246, R247 RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 D-LD1 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001005-GP RMF 1/4W 10 OHM 5% 2 R163, R263 RE-001201-GP 12 5% 5W METAL OXIDE FILM 8 R154, R155, R161, R162, R254, R255, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 5 R25, R170, R189, R270, R289 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 4 R124, R127, R224, R227 RE-010006-GP RMG 1/10W 100 5% 4 R109, R110, R209, R210 RE-010007-GP RMG 1/8W 100 OHM 5% 1206 2 R30, R197 RE-010008-GP RMF 1/4W 100 OHM 5% 2 R164, R264 RE-010009-GP 100 OHM POT PCB MOUNT 1 R231 RE-012003-GP RMF 3W 120 OHM 5% AL METAL 1 R17 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R196, R296 RE-027402-GP RMG 274 OHM 1/10W 5% 2 R113, R213 RE-039001-GP RMG 1/10W 390 OHM 5% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 9 R111, R115, R130, R132, R145, R215, R230, R232, R245

D177, D202–D206, D211–D216, D221, D271, D273

Q271, Q273

R249, R252, R253, R256, R259

Technical Service Manual 55 ISA Series Power Amplifiers

Main PCB Assembly ISA750 continued

QSC Part # Description Qty. Reference Comments

RE-082004-GP RMG 1/10W 820 OHM 5% 1206 1 R211 RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 4 R18, R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120003-GP RCF 1/8W 2K 5% ATS 2 R190, R195 RE-120004-GP RMG 1/10W 2K 1% 0805 5 R8, R11, R16, R290, R295 RE-122006-GP SVR 2.2K H3 7X7 4 R139, R140, R239, R240 RE-122007-GP RMG 1/10W 2.2K 5% 0805 2 R191, R291 RE-122008-GP RMF 5W 2.2K 5% METAL 6 R157, R158, R198, R257, R258, R298 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R168, R268 RE-130005-GP RMG 1/10W 3K 5% 0805 2 R141, R241 RE-130103-GP RMG 1/10W 3.01K 1% 0805 3 R24, R175, R275 RE-147001-GP RMG 1/10W 4.7K 5% 0805 10 R138, R174, R179, R187, R193, R238, R274, R279, R287, R293 RE-151003-GP RMF 5W 5.1K 5% AL METAL 4 R180, R188, R280, R288 RE-159003-GP 5.9K 1% 1/10W THK FLM 0805 4 R171, R184, R271, R284 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-182002-GP RMF 5W 8.2K 5% AL METAL 8 R118, R119, R133, R135, R218, R219, R233, R235 RE-210007-GP 10K 1% 1/10W THK FLM 0805 20 R22, R23, R31, R34–R38, R100, R101, R103, R105, R106, R128, R200,

RE-212002-GP RMF 1W 12K 5% AT METAL 4 R177, R194, R277, R294 RE-215007-GP RMF 1W 15K 5% METAL 2 R165, R265 RE-220005-GP RMG 1/10W 20K 1% 0805 3 R52, R250, R251 RE-223202-GP RMF 1/2W 23.2K 1% AT 5 R122, R123, R144, R222, R244 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 6 R18, R19, R117, R121, R217, R221 RE-233002-GP RMF 2W 33K 5% METAL 2 R2, R5 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-247005-GP RMG 1/10W 47K 5% 0805 4 R176, R183, R276, R283 RE-268002-GP RMG 1/8W 68K 5% 1206 5 R33, R22A, R22B, R23A, R23B RE-315003-GP RMG 1/8W 150K 5% 1206 11 R10, R104, R173, R178, R186, R192, R204, R273, R278, R286, R292 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R27 RE-346401-GP 464K 1% 1/8W THK FLM 1206 5 R39, R40, R166, R167, R266 RE-347003-GP RMG 1/10W 470K 5% 0805 4 R172, R185, R272, R285 RE-391001-GP RMG 1/8W 910K 1% 1206 3 R15, R116, R206 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 WC-000209-GP CABLE ASSY, 5 PIN 1 R131, R139, R140 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R201, R203, R205, R206, R228

PCB Assembly, AC/Input ISA750, 800Ti, & 800T

120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 This assembly is a panelized construction comprising the AC, input, and channel 2 bias adjust board assemblies, built on a common perforated circuit board. For the AC board assembly, order PCB-QZ060C-PSU; for the input board, order PCB-QZ060C-INP; and for the channel 2 bias adjust module, order PCB-QZ060C-BIAS.

QSC Part # Description Qty. Reference Comments

CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-122006-GP 220PF 50V 5% CER X7R 0805 4 C1–C4 CA-347005-GP CM 400V .047UF 10% RL 1 C10 CA-422005-GP CM 250V .22UF 10% RL 4 C127, C128, C227, C228 CA-810006-GP 1000UF 35V 20% ELECTROLYTIC 1 C6 CH-000170-GP BRACKET AC PCB MTG 2 CO-000204-GP CONN XLR F VERT PLASTIC 2 J101, J201 CO-000212-GP TERMINAL WRAP 20 E1–E12, J2A–J9A CO-000213-GP CONN 2 PIN STRAIGHT WAFER 1 J19 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 1 J21 CO-000224-GP CONN 6 PIN ST. WAFER 1 J400 CO-000225-GP CONN 5-PIN WAFER P2.5 1 J246

56 QSC Audio Products, Inc.

TD-000163-00 Rev. A

PCB Assembly, AC/Input ISA750, 800, 800Ti continued

QSC Part # Description Qty. Reference Comments

CO-000314-GP CONN 26 PIN DUAL ROW W/LCK EAR 1 IC-000213-GP IC 4N29 1U2 LB-000360-GP LABEL, BLANK, 30 X 7MM 10 WIRE MS-000126-GP HEATSINK, BRIDGE RECTIFIER 1 REF: Q3 NW-030001-GP WASHER M3.0 X 0.4 X 8 BZ 5 NW-032000-GP WASHER NYLON ID 3.2MM 4 PC-007502-00 SRV - PCB, AC/INPUT/TRIM ISA750/800T 1 QD-000200-GP DIODE RECT 1A 200V DB103 1 BR1 QD-000201-GP DIODE LL4148 SM 1 D20 QD-000214-GP TR TIP31C SAMSUNG 1 Q3 QD-000227-GP BRIDGE RECT 400V 25A 4 BR100, BR101, BR200, BR201 RE-.22001-GP RMG 1/10W 2.2 OHM 5% 0805 1 R50C RE-000005-GP POLYSWITCH 1.1A 0.15 OHM 1.5W 1 R1 RE-000270-GP NTC 30A 1 OHM 1 R21 RE-001201-GP 12 5% 5W METAL OXIDE FILM 2 R28, R29 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-006804-GP RMG 1/10W 68 OHM 5% 0805 1 R50B RE-010009-GP 100 OHM POT PCB MOUNT 1 R131 RE-012003-GP RMF 3W 120 OHM 5% AL METAL 1 R17 RE-110013-GP RMG 1/10W 1K 1% 0805 1 R50A RE-120003-GP RCF 1/8W 2K 5% ATS 1 R13 RE-122006-GP SVR 2.2K H3 7X7 2 R139, R140 RE-168002-GP RCF 1/8W 6.8K 5% ATS 2 R9, R14 RE-210006-GP RMG 1/10W 10K 1% 0805 1 R53 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R52, R150, R151, R250, R251 RE-347002-GP RMF 1/8W 470K 5% ATS 1 R12 SC-030006-GP M3 X 14MM BZ CR BH 4 SC-030007-GP M3 X 6MM B-TITE BLK ZN 2 SC-030008-GP SCREW M3X6 BLK TAP 2 SC-030009-GP BRASS STUD M3 18MM LG 2 SW-000089-GP 10 POLE DIP SWITCH 1 SW1 WC-000176-GP UL1015 #16 2P BLK L=300 4 -110_A, -110_B, -55_A, -55_B WC-000178-GP CONN ASSY RED W/TRND 4 +110_A, +110_B, +55_A, +55_B WC-000195-GP CONN ASSY W/TRNL ISA 750 2 CT_A, CT_B WC-000232-GP CONN WIRE 14AWG BLU W/1 TERM 1 JP10 WC-000233-GP CONN WIRE 14AWG BRN W/2 TERM 1 JP12 WC-000328-GP CABLE ASSY, 26 PIN RIBBON HDR 1

Technical Service Manual 57 ISA Series Power Amplifiers

6.8 ISA800T parts and assemblies

ISA800T Power Amplifier

120V: QSC part # FG-000805-00 230V: QSC part # FG-000805-02 220V Korea: QSC part # FG-000805-03 240V UK: QSC part # FG-000805-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 100V and 120V only TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V except UK WC-000273-GP AC CORD 240V UK, FUSE 13A 1 UK only WP-000805-00 ISA 800T CHASSIS ASSY (120V) 1 100V and 120V only WP-000805-02 ISA 800T CHASSIS ASSY (230V) 1 230V only except Korea WP-000805-03 ISA 800T CHASSIS ASSY (220V 60HZ) 1 220V Korea

Chassis Assembly ISA800T

120V: QSC part # WP-000805-00 230V: QSC part # WP-000805-02 220V Korea: QSC part # WP-000805-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000371-GP LABEL, CE, , , 1 230V only LB-000410-GP LABEL “UL LISTED” 1 100V and 120V only LB-000448-GP LABEL, REAR, ISA (NEW) 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000131-GP FAN GUARD, BLACK 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 8 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only

58 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA800T continued

QSC Part # Description Qty. Reference Comments

SW-000094-GP CIRCUIT BREAKER 8A 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 1 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000068-00 SRV - XFMR MNTG ASSY ISA SERIES 1 WP-000069-00 SRV - XFMR MNTG ASSY ISA300/500/800T 2 WP-000806-00 MAIN PCB ASSY, ISA 800T 1 WP-007502-00 PCB ASSY, AC/INPUT ISA750(120V) 1 120V only WP-007502-02 PCB ASSY, AC/INPUT, ISA750, 230V, 1 230V only XF-000192-GP PWR XFMR ISA800T/750 1 XF-000226-GP LINE XFMR ISA 800T 2

Main PCB Assembly ISA800T

QSC part # WP-000806-00

QSC Part # Description Qty. Reference Comments

CA-027003-GP CTC 200V 27PF 5% 1206 2 C111, C211 CA-047005-GP CC 50V 47PF 5% 0805 6 C170, C176, C177, C270, C276, C277 CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-110004-GP CC 50V 100PF 10% 0805 2 C9, C132 CA-110005-GP CC 50V 100PF 5% 0805 1.2 1 C130 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-210012-GP CM 100V .001UF 5% RL 5X 2 C131, C231 CA-215004-GP CM 250V .0015UF 5% RL 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C117, C215, C217 CA-233004-GP CM 50V .0033UF 5% RL 4 C172, C179, C272, C279 CA-310009-GP CC 50V .01UF 20% 0805 3 C5, C181, C281 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C133, C233 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 4 C124, C126, C224, C226 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 2 C11, C104 CA-410015-GP CM 50V .1UF 5% RL 6 C107–C109, C207–C209 CA-410016-GP CC 50V .1UF 10% 1206 2 C178, C278 CA-410018-GP CM 250V .1UF 5% RL 4 C174, C175, C274, C275 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-610009-GP CE 35V 10UF 20% RL 5 X 11 2 C171, C271 CA-622007-GP CE 25NP 22UF 20% RL 5X11 2 C129, C229 CA-647000-GP 47UF 16V 20% ELECTROLYTIC RL 3 C8, C106, C206 CA-710009-GP CE 25V 100UF 20% RL 6 C105, C173, C180, C205, C273, C280 CA-710010-GP CE 16NP 100UF 20% RL 8X11 2 C125, C225 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-912001-GP 12000UF, 20 PCNT, 63V, RL, , 8 C120–C123, C220–C223 CH-000163-GP HEATSINK ISA 750 3 SP 1 CH-000165-GP PCB HOLDER ISA GPE 1 CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 2 CH-000172-GP CLAMP TRANSISTOR 8 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J207, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 5 J108, J208, J257, J401, J402 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 6 J105, J106, J205, J206, J422, J423

Technical Service Manual 59 ISA Series Power Amplifiers

Main PCB Assembly ISA800T continued

QSC Part # Description Qty. Reference Comments

CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J258, J424 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 18 E100, E100A, E101, E112–E117, E117A, E200, E201, E212–E217 CO-000222-GP 8-PIN IC SOCKET 2 U101, U201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 CO-000224-GP CONN 6 PIN ST. WAFER 1 J421 CO-000226-GP CONN 13-PIN WAFER 2.0 2 J104, J204 HW-000020-GP FUSE HOLDER 6.3MM 4 F100, F200 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 IC-000214-GP LM311M VOLTAGE 4 U170, U171, U270, U271 MS-000127-GP FUSE T20A 125V 6.4 X 32MM 2 F100, F200 PC-007501-00 SRV - MAIN PCB, ISA 750/800T 1 PL-000150-GP LED HOLDER 3 REF: LD1A, LD100A, LD200A PL-000155-GP INSULATION SILICON FOR TO-220 2 PL-000156-GP RUBBER FEET 1 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 42 D2–D7, D9, D14, D16–D19, D102–D106, D111–D116, D121, D171, D173,

QD-000202-GP DIODE 1N4004 AL 5 D1, D10–D13 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 16 Q5, Q8, Q9, Q11, Q12, Q16–Q18, Q101, Q102, Q171, Q173, Q201, Q202,

QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 12 Q4, Q6, Q7, Q13–Q15, Q100, Q172, Q175, Q200, Q272, Q275 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000215-GP DIODE MUR1520 15A 200V 4 Q175, Q176, D275, D276 QD-000216-GP THYRISTOR 200V 0.1W 2N5064 2 D219, D220 QD-000217-GP DIODE, 400V, 3A, IN5404, DO-201AD 4 D117, D118, D217, D218 QD-000218-GP DIOD ZNR 3.8-4.0V 1/2 HZ SER 2 D170, D270 QD-000219-GP DIODE ZENER 1.3W 10V TEMIC 2 D174, D274 QD-000220-GP DIODE ZENER 1W 12V AT TEMIC 2 D178, D278 QD-000221-GP TRIAC 600V 40A MAC224 A8 2 Q113, Q213 QD-000222-GP TR RFP50N06 N-CH PWR 4 Q170, Q174, Q270, Q274 QD-000223-GP TR 2N5064 TRIODE 2 D119, D120 QD-000269-GP DIODE ZENER 5.1V 5% .25W DO-35 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.15003-GP 1.5 OHM 5% 2W THK FLM 4 R181, R182, R281, R282 RE-.33001-GP RMF 1W 3.3 OHM 5% 5 R20, R146, R147, R246, R247 RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 D-LD1 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001005-GP RMF 1/4W 10 OHM 5% 2 R163, R263 RE-001201-GP 12 5% 5W METAL OXIDE FILM 8 R154, R155, R161, R162, R254, R255, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237 RE-004702-GP RMG 1/10W 47 OHM 5% 0805 5 R25, R170, R189, R270, R289 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 4 R124, R127, R224, R227 RE-010006-GP RMG 1/10W 100 5% 4 R109, R110, R209, R210 RE-010007-GP RMG 1/8W 100 OHM 5% 1206 2 R30, R197 RE-010008-GP RMF 1/4W 100 OHM 5% 2 R164, R264 RE-010009-GP 100 OHM POT PCB MOUNT 1 R231

D177, D202–D206, D211–D216, D221, D271, D273, D277

Q271, Q273

R249, R252, R253, R256, R259

60 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA800T continued

QSC Part # Description Qty. Reference Comments

RE-012003-GP RMF 3W 120 OHM 5% AL METAL 1 R17 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R196, R296 RE-027402-GP RMG 274 OHM 1/10W 5% 2 R113, R213 RE-039001-GP RMG 1/10W 390 OHM 5% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 9 R111, R115, R130, R132, R145, R215, R230, R232, R245 RE-082004-GP RMG 1/10W 820 OHM 5% 1206 1 R211 RE-107000-GP 1070 OHM 1% 1 R50 RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 4 R18, R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120003-GP RCF 1/8W 2K 5% ATS 2 R190, R195 RE-120004-GP RMG 1/10W 2K 1% 0805 5 R8, R11, R16, R290, R295 RE-122006-GP SVR 2.2K H3 7X7 4 R239, R240, R139, R140 RE-122007-GP RMG 1/10W 2.2K 5% 0805 2 R191, R291 RE-122008-GP RMF 5W 2.2K 5% METAL 6 R157, R158, R198, R257, R258, R298 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R168, R268 RE-130005-GP RMG 1/10W 3K 5% 0805 2 R141, R241 RE-130103-GP RMG 1/10W 3.01K 1% 0805 3 R24, R175, R275 RE-147001-GP RMG 1/10W 4.7K 5% 0805 10 R138, R174, R179, R187, R193, R238, R274, R279, R287, R293 RE-151003-GP RMF 5W 5.1K 5% AL METAL 4 R180, R188, R280, R288 RE-159003-GP 5.9K 1% 1/10W THK FLM 0805 4 R171, R184, R271, R284 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-182002-GP RMF 5W 8.2K 5% AL METAL 8 R118, R119, R133, R135, R218, R219, R233, R235 RE-210007-GP 10K 1% 1/10W THK FLM 0805 20 R22, R23, R31, R34–R38, R100, R101, R103, R105, R106, R128, R200,

RE-212001-GP RMG 1/10W 12K 5% 0805 2 R176, R276 RE-212002-GP RMF 1W 12K 5% AT METAL 4 R177, R194, R277, R294 RE-215007-GP RMF 1W 15K 5% METAL 2 R165, R265 RE-220005-GP RMG 1/10W 20K 1% 0805 3 R52, R250, R251 RE-223202-GP RMF 1/2W 23.2K 1% AT 5 R122, R123, R144, R222, R244 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 6 R18, R19, R117, R121, R217, R221 RE-233002-GP RMF 2W 33K 5% METAL 2 R2, R5 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-247005-GP RMG 1/10W 47K 5% 0805 2 R183, R283 RE-268002-GP RMG 1/8W 68K 5% 1206 5 R22A, R22B, R23A, R23B, R33 RE-315003-GP RMG 1/8W 150K 5% 1206 11 R10, R104, R173, R178, R186, R192, R204, R273, R278, R286, R292 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R27 RE-346401-GP 464K 1% 1/8W THK FLM 1206 5 R39, R40, R166, R167, R266 RE-347003-GP RMG 1/10W 470K 5% 0805 4 R172, R185, R272, R285 RE-391001-GP RMG 1/8W 910K 1% 1206 3 R15, R116, R206 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 WC-000209-GP CABLE ASSY, 5 PIN 1 R131, R139, R140 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R201, R203, R205, R206, R228

PCB Assembly, AC/Input ISA750, 800Ti, & 800T

120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 See parts listing on pages 56 and 57.

Technical Service Manual 61 ISA Series Power Amplifiers

6.9 ISA800Ti parts and assemblies

ISA800Ti Power Amplifier

120V: QSC part # FG-000825-00 230V: QSC part # FG-000825-02 220V Korea: QSC part # FG-000825-03 240V UK: QSC part # FG-000825-04

QSC part # Description Qty. Reference Comments

CH-000155-GP TOP COVER ISA 1 CO-000228-GP EURO 3 PIN CONNECTOR, GRN 2 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 PL-000156-GP RUBBER FEET 4 PL-000164-GP AC CORD PROTECTOR 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 16 ALT. P/N: SC-040002-GP TD-000093-00 OWNERS MANUAL, ISA, 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 100V and 120V only TS-000004-WR 3 YEARS WARRANTY 3 WC-000181-GP AC CORD 15A ISA 1 100V and 120V only WC-000213-GP AC CORD 1 230V except UK WC-000273-GP AC CORD 240V UK, FUSE 13A 1 UK only WP-000825-00 ISA 800TI CHASSIS ASSY (120V) 1 100V and 120V only WP-000825-02 ISA 800TI CHASSIS ASSY (230V) 1 230V only

Chassis Assembly ISA800Ti

120V: QSC part # WP-000825-00 230V: QSC part # WP-000825-02 220V Korea: QSC part # WP-000825-03

QSC Part # Description Qty. Reference Comments

CH-000153-GP CHASSIS FAB ISA 1 CH-000166-GP RACK EAR ISA 2 CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000174-GP COVER, XFMR, STEEL, SMALL, ISA 2 CO-000211-GP AC INLET 250V 15A 1 CO-000218-GP 6 POLE SPEAKER TERMINAL 2 LB-000355-GP LABEL, GROUND 1 LB-000371-GP LABEL, CE, , , 1 230V only LB-000410-GP LABEL “UL LISTED” 1 120V only LB-000449-GP LABEL, REAR, , ISATI, 1 LB-000452-GP LABEL, FRONT, , ISA 800TI, 1 MS-000122-GP DC FAN, 24V 119X119X38MM 1 MS-000131-GP FAN GUARD, BLACK 1 NW-000036-GP NUT, HEX M6, , , 2 NW-000037-GP WASHER, LOCK M6, , , 2 NW-030000-GP SPRING WASHER M3 X 0.9 X 5.5 1 NW-030002-GP I/T WASHER M3 X 0.5 X 6.4 WZ 1 NW-040001-GP NUT KEPS M4 4 NW-080003-GP NUT M8X13MM 6.5MM THK STL WHT 1 NW-080004-GP LOCK WASHER M8 SPLIT ID 8.5MM 1 PL-000149-GP KNOB, VR 2 PL-000157-GP XFMR RUBBER PAD (LARGE) 2 PL-000158-GP XFMR RUBBER PAD (SMALL) 4 SC-000020-GP BOLT, M8 X 100MM, , , WHT ZINC, 1 SC-000021-GP BOLT, M6 X 55MM, , , WHT ZINC, 2 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4

62 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Chassis Assembly ISA800Ti continued

QSC Part # Description Qty. Reference Comments

SC-030002-GP M3 B-TITE FLAT-CS 2 SC-030004-GP M3 X 8 BLK MACHINE 16 SC-030005-GP M3 X 12MM (BLK/ZINC) 4 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 4 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 10 ALT. P/N: SC-040001-GP SW-000088-GP ROCKER POWER SWITCH 1 SW-000091-GP CIRCUIT BREAKER 15A 1 100V and 120V only SW-000094-GP CIRCUIT BREAKER 8A 1 230V only WC-000169-GP CONN ASSY 2PIN ISA 2 WC-000171-GP CONN ASSY 3-PIN 1 WC-000173-GP CONN ASSY 4P P2.5 L=200 AWG26 2 WC-000174-GP CONN ASSY 6-PIN ISA 280 1 WC-000175-GP CONN ASSY 8P P2.5 L=460 AWG26 1 WC-000177-GP UL1015 #14 2P GRN L=100 1 WC-000179-GP UL1015 #16 3P BRN L=360 2 WC-000180-GP UL1015 #16 2P OFFWHITE 2 WC-000182-GP CONN ASSY 13P P2.0 L=240 1 WC-000192-GP UL 2547 3-PIN P2.5 L=250 2 WC-000198-GP GROUND WIRE 1 WC-000199-GP UL 1015 AWG#14 BROWN 0.12 WC-000211-GP WIRE ASSY, FAN GROUND 1 WP-000826-00 MAIN PCB ASSY, ISA 800TI 1 WP-007502-00 PCB ASSY, AC/INPUT ISA750(120V) 1 100V and 120V only WP-007502-02 PCB ASSY, AC/INPUT, ISA750, 230V, 1 230V only XF-000192-GP PWR XFMR ISA800T/750 1 XF-000270-GP LINE ISA XFMR ISA 800TI 2

Main PCB Assembly ISA800Ti

QSC part # WP-004501-00

QSC Part # Description Qty. Reference Comments

CA-027003-GP CTC 200V 27PF 5% 1206 2 C111, C211 CA-047005-GP CC 50V 47PF 5% 0805 6 C170, C176, C177, C270, C276, C277 CA-056001-GP CC 50V 56PF 10% 0805 2 C110, C210 CA-110004-GP CC 50V 100PF 10% 0805 2 C9, C132 CA-110005-GP CC 50V 100PF 5% 0805 1.2 1 C130 CA-118000-GP CC 50V 180PF 5% 0805 4 C101, C103, C201, C203 CA-210012-GP CM 100V .001UF 5% RL 5X 2 C131, C231 CA-215004-GP CM 250V .0015UF 5% RL 2 C114, C214 CA-222007-GP 50V .0022UF 10% 1206 4 C115, C117, C215, C217 CA-233004-GP CM 50V .0033UF 5% RL 4 C172, C179, C272, C279 CA-310009-GP CC 50V .01UF 20% 0805 3 C5, C181, C281 CA-322006-GP CM 50V .022UF 5% RL 4 C116, C119, C216, C219 CA-322007-GP CC 50V .022UF 10% 0805 2 C133, C233 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 4 C124, C126, C224, C226 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 2 C11, C104 CA-410015-GP CM 50V .1UF 5% RL 6 C107–C109, C207–C209 CA-410016-GP CC 50V .1UF 10% 1206 2 C178, C278 CA-410018-GP CM 250V .1UF 5% RL 4 C174, C175, C274, C275 CA-547008-GP 4.7UF 20% 250V ELECTRO RAD 1 C7 CA-610009-GP CE 35V 10UF 20% RL 5 X 11 2 C171, C271 CA-622007-GP CE 25NP 22UF 20% RL 5X11 2 C129, C229 CA-647000-GP 47UF 16V 20% ELECTROLYTIC RL 3 C8, C106, C206 CA-710009-GP CE 25V 100UF 20% RL 6 C105, C173, C180, C205, C273, C280 CA-710010-GP CE 16NP 100UF 20% RL 8X11 2 C125, C225 CA-722006-GP CE 25V 220UF 20% RL 5 C13, C112, C113, C212, C213 CA-912001-GP 12000UF, 20 PCNT, 63V, RL, , 8 C120–C123, C220–C223 CH-000163-GP HEATSINK ISA 750 3 SP 1 CH-000165-GP PCB HOLDER ISA GPE 1

Technical Service Manual 63 ISA Series Power Amplifiers

Main PCB Assembly ISA800Ti continued

QSC Part # Description Qty. Reference Comments

CH-000168-GP VR BRACKET ISA 2 CH-000171-GP BRACKET, RT ANGLE HD15 2 CH-000172-GP CLAMP TRANSISTOR 8 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 2 J207, J425 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 5 J108, J208, J257, J401, J402 CO-000215-GP CONN 4 PIN STRAIGHT WAFER 6 J105, J106, J205, J206, J422, J423 CO-000216-GP CONN 8 PIN STRAIGHT WAFER 2 J258, J424 CO-000219-GP 3 PIN INPUT JACK 2 J102, J202 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 18 E100, E100A, E101, E112–E117, E117A, E200, E201, E212–E217 CO-000222-GP 8-PIN IC SOCKET 2 REF:U101,201 CO-000223-GP 26-PIN DUAL ROW IEC 2 J1, J203 CO-000224-GP CONN 6 PIN ST. WAFER 1 J421 CO-000226-GP CONN 13-PIN WAFER 2.0 2 J104, J204 HW-000020-GP FUSE HOLDER 6.3MM 4 REF: F100,200 IC-000211-GP IC NE5532 OP AMP 2 U101, U201 IC-000212-GP IC NE5517D 1 U10 IC-000214-GP LM311M VOLTAGE 4 U170, U171, U270, U271 MS-000127-GP FUSE T20A 125V 6.4 X 32MM 2 F100, F200 PC-007501-00 SRV - MAIN PCB, ISA 750/800T 1 PL-000150-GP LED HOLDER 3 REF: LD100A,200A,LD1A PL-000155-GP INSULATION SILICON FOR TO-220 2 PL-000156-GP RUBBER FEET 1 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R112, R212 QD-000197-GP LED 4.7MM RED W/STAND 2 LD100A, LD200A QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1A, LD101A, LD201A QD-000201-GP DIODE LL4148 SM 42 D2–D7, D9, D14, D16–D19, D102–D106, D111–D116, D121, D171, D173,

QD-000202-GP DIODE 1N4004 AL 5 D1, D10–D13 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D8, D15, D100, D101, D200, D201 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 16 Q5, Q8, Q9, Q11, Q12, Q16–Q18, Q101, Q102, Q171, Q173, Q201, Q202,

QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 12 Q4, Q6, Q7, Q13–Q15, Q100, Q172, Q175, Q200, Q272, Q275 QD-000206-GP DIOD RECT FAST, IN4934 AT 4 D108, D109, D208, D209 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 3 Q10, Q105, Q205 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 8 Q103, Q107, Q109, Q111, Q203, Q207, Q209, Q211 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 8 Q104, Q108, Q110, Q112, Q204, Q208, Q210, Q212 QD-000210-GP XISTOR PNP 250V MJE15033 2 Q106, Q206 QD-000213-GP TR KST42 1Q1 QD-000215-GP DIODE MUR1520 15A 200V 4 D175, D176, D275, D276 QD-000216-GP THYRISTOR 200V 0.1W 2N5064 2 D219, D220 QD-000217-GP DIODE, 400V, 3A, IN5404, DO-201AD 4 D117, D118, D217, D218 QD-000218-GP DIOD ZNR 3.8-4.0V 1/2 HZ SER 2 D170, D270 QD-000219-GP DIODE ZENER 1.3W 10V TEMIC 2 D174, D274 QD-000220-GP DIODE ZENER 1W 12V AT TEMIC 2 D178, D278 QD-000221-GP TRIAC 600V 40A MAC224 A8 2 Q113, Q213 QD-000222-GP TR RFP50N06 N-CH PWR 4 Q170, Q174, Q270, Q274 QD-000223-GP TR 2N5064 TRIODE 2 D119, D120 QD-000269-GP DIODE ZENER 5.1V 5% .25W DO-35 4 D107, D110, D207, D210 RE-.02201-GP 0.22 OHM 5% 3W THK FLM 16 R142, R143, R148, R149, R152, R153, R156, R159, R242, R243, R248,

RE-.15003-GP 1.5 OHM 5% 2W THK FLM 4 R181, R182, R281, R282 RE-.33001-GP RMF 1W 3.3 OHM 5% 5 R146, R147, R20, R246, R247 RE-.56006-GP RMF 2W 5.6 OHM 5% 2 R160, R260 RE-000004-GP RMG 1/8W 0 OHM 5% 1206 1 LD1 RE-000250-GP NTC RES 50 OHM 2 R134, R234 RE-000260-GP THERMAL PTC 60C 100 OHM 2 R4, R7 RE-001005-GP RMF 1/4W 10 OHM 5% 2 R163, R263 RE-001201-GP 12 5% 5W METAL OXIDE FILM 8 R154, R155, R161, R162, R254, R255, R261, R262 RE-002202-GP RMF 1W 22 5% AT FP 4 R136, R137, R236, R237

D177, D202–D206, D211–D216, D221, D271, D273, D277

Q271, Q273

R249, R252, R253, R256, R259

64 QSC Audio Products, Inc.

TD-000163-00 Rev. A

Main PCB Assembly ISA800Ti continued

QSC Part # Description Qty. Reference Comments

RE-004702-GP RMG 1/10W 47 OHM 5% 0805 5 R25, R170, R189, R270, R289 RE-007506-GP RMG 1/10W 75 OHM 5% 0805 4 R124, R224, R127, R227 RE-010006-GP RMG 1/10W 100 5% 4 R109, R110, R209, R210 RE-010007-GP RMG 1/8W 100 OHM 5% 1206 2 R30, R197 RE-010008-GP RMF 1/4W 100 OHM 5% 2 R164, R264 RE-010009-GP 100 OHM POT PCB MOUNT 1 R231 RE-012003-GP RMF 3W 120 OHM 5% AL METAL 1 R17 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 2 R196, R296 RE-027402-GP RMG 274 OHM 1/10W 5% 2 R113, R213 RE-039001-GP RMG 1/10W 390 OHM 5% 0805 2 R120, R220 RE-082003-GP RMG 1/8W 820 OHM 5% 1206 9 R111, R115, R130, R132, R145, R215, R245, R230, R232 RE-082004-GP RMG 1/10W 820 OHM 5% 1206 1 R211 RE-107000-GP 1070 OHM 1% 1 R50 RE-110011-GP RMF 5W 1K 5% 1 R32 RE-110012-GP RMG 1/10W 1K 5% 0805 3 R102, R126, R202 RE-112001-GP RMG 1/10W 1.2K 1% 0805 4 R18, R19, R114A, R214A RE-115004-GP RMG 1/10W 1.5K 5% 0805 2 R129, R229 RE-120003-GP RCF 1/8W 2K 5% ATS 2 R190, R195 RE-120004-GP RMG 1/10W 2K 1% 0805 5 R8, R11, R16, R290, R295 RE-122006-GP SVR 2.2K H3 7X7 4 R239, R240, R139, R140 RE-122007-GP RMG 1/10W 2.2K 5% 0805 2 R191, R291 RE-122008-GP RMF 5W 2.2K 5% METAL 6 R157, R158, R198, R257, R258, R298 RE-130004-GP RMG 1/8W 3K 1% 1206 2 R168, R268 RE-130005-GP RMG 1/10W 3K 5% 0805 2 R141, R241 RE-130103-GP RMG 1/10W 3.01K 1% 0805 3 R24, R175, R275 RE-147001-GP RMG 1/10W 4.7K 5% 0805 8 R174, R179, R187, R193, R274, R279, R287, R293 RE-151003-GP RMF 5W 5.1K 5% AL METAL 4 R180, R188, R280, R288 RE-159003-GP 5.9K 1% 1/10W THK FLM 0805 4 R171, R184, R271, R284 RE-175003-GP RMG 1/10W 7.5K 5% 0805 2 R108, R208 RE-182002-GP RMF 5W 8.2K 5% AL METAL 8 R118, R119, R133, R135, R218, R219, R233, R235 RE-210007-GP 10K 1% 1/10W THK FLM 0805 20 R22, R23, R31, R34–R38, R100, R101, R103, R105, R106, R128, R200,

RE-212002-GP RMF 1W 12K 5% AT METAL 4 R177, R194, R277, R294 RE-215007-GP RMF 1W 15K 5% METAL 2 R165, R265 RE-220005-GP RMG 1/10W 20K 1% 0805 3 R52, R250, R251 RE-223202-GP RMF 1/2W 23.2K 1% AT 5 R122, R123, R144, R222, R244 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 6 R18, R19, R117, R121, R217, R221 RE-233002-GP RMF 2W 33K 5% METAL 2 R2, R5 RE-239001-GP RMG 1/10W 39K 5% 0805 2 R107, R207 RE-247004-GP RMG 1/8W 47K 5% 1206 2 R125, R225 RE-247005-GP RMG 1/10W 47K 5% 0805 4 R176, R276, R183, R283 RE-268002-GP RMG 1/8W 68K 5% 1206 5 R22A, R22B, R23A, R23B, R33 RE-315003-GP RMG 1/8W 150K 5% 1206 11 R10, R104, R173, R178, R186, R192, R204, R273, R278, R286, R292 RE-322001-GP RMG 1/8W 220K 5% 1206 1 R26 RE-330001-GP RMG 1/8W 330K 5% 1206 1 R27 RE-346401-GP 464K 1% 1/8W THK FLM 1206 5 R39, R40, R166, R167, R266 RE-347003-GP RMG 1/10W 470K 5% 0805 4 R172, R185, R272, R285 RE-391001-GP RMG 1/8W 910K 1% 1206 3 R15, R116, R206 RE-410002-GP RMG 1/8W 1M 5% 1206 2 R3, R6 WC-000209-GP CABLE ASSY, 5 PIN 1 REF: R131,139,140 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 2 L100, L200

R201, R203, R205, R206, R228

PCB Assembly, AC/Input ISA750, 800Ti, & 800T

120V: QSC part # WP-007502-00 230V: QSC part # WP-007502-02 See parts listing on pages 57 and 58.

Technical Service Manual 65 ISA Series Power Amplifiers

6.10 ISA1350 parts and assemblies

ISA1350 Power Amplifier

120V: QSC part # FG-001350-00 230V: QSC part # FG-001350-02

QSC Part # Description Qty. Reference Comments

Chassis Assembly ISA1350 (beginning May 2006)

120V: QSC part # WP-013503-00 230V: QSC part # WP-013503-02 220V Korea: QSC part # WP-013503-03

QSC Part # Description Qty. Reference Comments

Chassis Assembly ISA1350 (before May 2006)

120V: QSC part # WP-013500-00 230V: QSC part # WP-013500-02 220V Korea: QSC part # WP-013500-03

QSC Part # Description Qty. Reference Comments

LB-000410-GP LABEL “UL LISTED” 1 100V and 120V only LB-000371-GP LABEL, CE, , , 1 230V only QD-000257-GP BRDG RECT 400V 35A IN-LINE 6 BR101–BR103, BR201–BR203 XF-000201-GP XFMR, PWR, 50/60HZ, TOROID, CH2 RT 1 XF-000229-GP XFMR, PWR, 50/60HZ, TOROID, CH1 LT 1

Main PCB Assembly ISA450

QSC part # WP-013501-00

QSC Part # Description Qty. Reference Comments

CA-015004-GP 15PF 5% 200V CERAMIC X7R 0805 1 C113 CA-027004-GP 27PF 5% 50V COG 0805 1 C116 CA-047005-GP CC 50V 47PF 5% 0805 8 C127, C128, C132, C133, C136, C137, C161, C162 CA-110005-GP CC 50V 100PF 5% 0805 1.2 2 C101, C103 CA-122005-GP CC 50V 220PF 5% 0805 4 C20–C23 CA-147006-GP 470PF 5% 50V CER NPO 4 C1–C4 CA-210012-GP CM 100V .001UF 5% RL 5X 1 C106 CA-215004-GP CM 250V .0015UF 5% RL 1 C114 CA-222007-GP 50V .0022UF 10% 1206 6 C122, C125, C126, C164, C165, C170 CA-222012-GP 0.0022UF, 5 PCNT, 250V, RADIAL, , 1 C121 CA-233006-GP 0.0033UF 5% 50V CER X7R 0805 1 C102 All 220–240V only CA-247003-GP .0047UF, 5%, 50V, CERAMIC, 0805 1 C102 100V and 120V only CA-256002-GP 0.0056UF 10% 50V CER X7R 0805 1 C120 CA-310011-GP .01UF 5% 250V METALIZED POLY 4 C142–C144, C147 CA-322007-GP CC 50V .022UF 10% 0805 1 C171 CA-368004-GP 0.068UF 5% 250V FILM DIPPED 2 C159, C160 CA-410014-GP 0.1UF 10% 50V CER X7R 0805 4 C15, C105, C129, C130 CA-410018-GP CM 250V .1UF 5% RL 1 C163 CA-415005-GP 0.15UF 5% 100V MYLAR 2 C109, C112 CA-422005-GP CM 250V .22UF 10% RL 3 C5, C7, C9 CA-422007-GP 0.22UF 5% 100V FILM 1 C108 CA-447009-GP 0.47UF 20% 50V CER X7R 0805 2 C13, C14 CA-610020-GP CE 50V 10UF 20% RLT 5 X 11 4 C110, C131, C134, C135 CA-622007-GP CE 25NP 22UF 20% RL 5X11 1 C158 CA-710010-GP CE 16NP 100UF 20% RL 8X11 2 C104, C111 CA-710012-GP CE 25V 100UF 20% RLT 8X11.5 7 C107, C117, C118, C138, C139, C140, C141 CA-722006-GP CE 25V 220UF 20% RL 2 C115, C119 CA-822001-GP 2200UF 20% 25V ELECTRO RADIAL 2 C11, C12 CA-915001-GP 15000UF, 20 PCNT, 50V, ELECTROLYTIC, , 12 C145, C146, C148–C157 CH-000166-GP RACK EAR ISA 1 CH-000168-GP VR BRACKET ISA 1 CH-000171-GP BRACKET, RT ANGLE HD15 1

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Main PCB Assembly ISA1350 continued

QSC Part # Description Qty. Reference Comments

CH-000173-GP COVER, XFMR, STEEL, LARGE 1 CH-000231-GP PCB HOLDER RMX 4050HD 1 CH-000232-GP HEATSINK RMX 4050HD 1 CH-000247-GP CLAMP TRANSISTER 6 FINGER 1 CH-000248-GP CLAMP TRANSISTER 4 FINGER 1 CH-000308-GP NTC HOLDER 1 CH-000389-GP CHASSIS FAB ISA 1350 1 CH-000390-GP TOP COVER ISA 1350 1 CO-000204-GP CONN XLR F VERT PLASTIC 2 J151, J251 CO-000211-GP AC INLET 250V 15A 1 CO-000213-GP CONN 2 PIN STRAIGHT WAFER 1 J19 CO-000214-GP CONN 3 PIN STRAIGHT WAFER 5 J8, J9, J18, J20, J102 CO-000218-GP 6 POLE SPEAKER TERMINAL 1 CO-000219-GP 3 PIN INPUT JACK 3 J112, J212 CO-000220-GP CONN HD15 1 J50 CO-000221-GP Z-TAB ISA 35 J13–J15, J21A, J21B, J22A, J22B, J23A, J23B, J24A, J24B, J25A,

CO-000222-GP 8-PIN IC SOCKET 2 U101, U103 CO-000278-GP HDR .1 CNTR 30P(2X15)MALE LOCK 1 J6 CO-000279-GP JM2422-3M WAFER 2 J29, J30 CO-000280-GP HDR 2.5MM CNTR 7P(1X7)MALE 3 J16, J17, J103 CO-000281-GP HDR 6.3MM CNTR 6P(2X3)MALE 1 J104 CO-000282-GP HDR, 2.5MM CNTR 14P(2X7)MALE, LK 1 J101 CO-000316-GP SOCKET 24PIN DUAL/ROW IEC ANGL 2 J105, J122 HW-000020-GP FUSE HOLDER 6.3MM 1 F101 HW-000075-GP FUSE HOLDER, , , , , 1 F201 IC-000211-GP IC NE5532 OP AMP 2 U101, U103 IC-000212-GP IC NE5517D 1 U102 IC-000214-GP LM311M VOLTAGE 4 U106–U109 LB-000438-GP LABEL, WARNING, RAIN & MOISTURE 1 LB-000470-GP LABEL, ISA 1350 REAR 3RU PLTFM 1 MS-000126-GP HEATSINK, BRIDGE RECTIFIER 1 Q6 MS-000189-GP 30A 250V 6.4MM X 32MM FAST 1 F101 MS-000190-GP FAN GUARD WIRE 120MM BLACK 1 MS-000191-GP FAN, 24VDC, 119 X 119 X 38MM 1 MS-000193-GP HEATSINK, BRIDGE RECTIFIER, 40MM, , 2 Q110, Q111 MS-000220-GP FUSE T1A 250V SEM/UDE 5X20MM 1 F201 NW-040001-GP NUT KEPS M4 3 NW-040002-GP SPRING WASHER M4 X 7 1 NW-040003-GP I/T WASHER M4X0.4X8, YZ 2 NW-040006-GP HEX NUT M4 X 0.7 X 7MM 1 NW-080003-GP NUT M8X13MM 6.5MM THK STL WHT 1 NW-080004-GP LOCK WASHER M8 SPLIT ID 8.5MM 1 PC-001351-00 PCB, MAIN, ISA 1350 1 PC-001352-00 PCB, INPUT, ISA 1350 1 PC-001353-00 PCB, RBN CBL SUPPORT, ISA 1350 1 PC-001354-00 PCB, CLIP & SIGNAL, ISA 1350 1 PC-001355-00 PCB, POWER & PROTECT, ISA 1350 1 PC-001356-00 PCB, DATAPORT & GAIN, ISA 1350 1 PC-001357-00 PCB, RECTIFIER, ISA 1350 1 PC-001358-00 PCB, PANELIZED, POWER, ISA 1350 1 PC-001359-00 PCB, POWER SUPPLY, ISA 1350 1 PL-000149-GP KNOB, VR 1 PL-000150-GP LED HOLDER 3 LD1, LD3, LD6 PL-000152-GP CABLE TIE, ISA 1 PL-000156-GP RUBBER FEET 1 PL-000162-GP INSULATION BUSHING 2 REF: Q110, Q111 PL-000246-GP INSUL, XISTOR, 11.6X19X.23, THERM 2 REF: Q110, Q111 PL-000253-GP SLEEVE, RIBBON, 50X120X.4MM, BLK 1 PL-000327-GP PAD, XFMR, EPDM 40A, 1/8" THK, BLACK, 1

J25B, J26A, J26B, J27A, J27B, J28A, J28B, J301–J312, E101–E104

Technical Service Manual 67 ISA Series Power Amplifiers

Main PCB Assembly ISA1350 continued

QSC Part # Description Qty. Reference Comments

PL-000328-GP INSULATOR, TO-220, 4-POS, , , 1 PM-000042-GP SHIPPING CARTON, BOX, ISA 3RU (NEW QSC) 1 PM-000043-GP CARTON, INSERT 2 PM-000048-GP POLYBAG MANUAL 1 PM-000049-GP BAG, PLASTIC, 4" X 6" 1 PM-000050-GP BAG, POLY, RMX, 430 X 505 X 360MM 1 PM-000063-GP POLYBAG 1 PT-225000-GP RES VAR 2.5K RT ANGLE PCB 2 R5, R6 QD-000197-GP LED 4.7MM RED W/STAND 1 LD5 QD-000198-GP LED 4.7MM GRN W/STAND 3 LD1, LD3, LD6 QD-000200-GP DIODE RECT 1A 200V DB103 2 BR7, BR8 QD-000201-GP DIODE LL4148 SM 6 D1–D6 QD-000203-GP DIOD ZNR 15V 1W SILICON EPIT 6 D103, D104, D109, D111, D125, D126 QD-000204-GP XISTOR NPN 60V 200MA 3904 SOT-23 17 Q2, Q5, Q102–Q105, Q107, Q108, Q112, Q118, Q121, Q123, Q125, Q126,

QD-000205-GP XISTOR PNP 40V 0.2A TR3906 SOT-23 15 Q1, Q3, Q4, Q7, Q101, Q106, Q109, Q113, Q122, Q124, Q127, Q129,

QD-000206-GP DIOD RECT FAST, IN4934 AT 2 D106, D107 QD-000207-GP XISTOR NPN 250V 0.5A MJE15032 1 Q110 QD-000208-GP XISTOR PNP 230V 5A 2SA1943 6 Q114, Q116, Q119, Q130, Q133, Q137 QD-000209-GP XISTOR NPN 230V 5A 2SC5200 6 Q115, Q117, Q120, Q131, Q138, Q134 QD-000210-GP XISTOR PNP 250V MJE15033 1 Q111 QD-000214-GP TR TIP31C SAMSUNG 1 Q6 QD-000215-GP DIODE MUR1520 15A 200V 4 D127–D130 QD-000216-GP THYRISTOR 200V 0.1W 2N5064 2 D131, D132 QD-000217-GP DIODE, 400V, 3A, IN5404, DO-201AD 2 D123, D124 QD-000218-GP DIOD ZNR 3.8-4.0V 1/2 HZ SER 2 D108, D110 QD-000255-GP LED RED 4.7MM AC W/RT ANG&HLDR 2 LD2, LD4 QD-000256-GP DIOD ZNR 7.29-7.67V, 1/2W HZ 1 D11 QD-000260-GP MOSFET, N-CH, 60V, 52A, 52N06V 4 Q135, Q136, Q139, Q140 QD-000261-GP TRIAC 600V 40A BTA41-600B, TOP3 1 Q146 QD-000262-GP DIODE 75V 1N4148 DO-35 4NS 16 D101, D102, D113–D122, D133–D135, D203 QD-000280-GP DIODE 1N4001 ELE-DO002 2 D201, D202 RE-.02202-GP 0.22 5% 3W THICK FILM 15 R128, R199, R200, R209, R210, R216, R217, R222–R224, R228, R236,

RE-.39001-GP 3.9 5% 5W METAL FILM 6 R243–R246, R266, R268 RE-.47002-GP 4.7 1% 1/8W METAL FILM 1206 2 R197, R202 RE-.56006-GP RMF 2W 5.6 OHM 5% 1 R254 RE-000005-GP POLYSWITCH 1.1A 0.15 OHM 1.5W 4 R9–R12 RE-000231-GP NTC 10K 1% -3.7% PER C 1 R239 RE-000270-GP NTC 30A 1 OHM 2 R7, R8 RE-001005-GP RMF 1/4W 10 OHM 5% 1 R260 RE-001006-GP 10, 1 PCNT, 1/10W, THICK FILM, 0805, 100V 4 R229, R230, R234, R235 RE-001009-GP 10 1% 1/8W THK FLM 1206 1 R160 RE-001201-GP 12 5% 5W METAL OXIDE FILM 8 R247–R249, R251, R256–R259 RE-001204-GP 12 5% 1W METAL FILM 1 R201 RE-001300-GP RMF 1W 13 OHM 5% AT MET OX 1 R198 RE-003901-GP RMG 1/10W 39 OHM 1% 0805 4 R22, R124, R172, R178 RE-003902-GP 39 1 PCNT 1/8W THK FLM 1206 2 R150, R152 RE-004753-GP RMG 1/10W 47.5 OHM 1% 0805 1 R51 RE-005001-GP 50 OHM POT PCB MOUNT 1 R171 RE-010008-GP RMF 1/4W 100 OHM 5% 1 R261 RE-010009-GP 100 OHM POT PCB MOUNT 1 RE-010011-GP 100 1% 1/10W THK FLM 0805 100V 4 R107, R121, R122, R233 RE-012006-GP 120 5% 5W METAL FILM 1 R25 RE-020003-GP 200 1% 1/10W THK FLM 0805 100V 1 R153 RE-027004-GP RMG 1/10W 270 OHM 1% 0805 1 R117 RE-027403-GP 274 1% 1/10W THICK FILM 0805 2 R118, R120 RE-060402-GP RMG 1/10W 604OHM 1% 0805 1 R271 RE-062001-GP 620 1% 1/10W THK FLM 0805 1 R240

Q128, Q132, Q142

Q141, Q143, Q147

R237, R241, R242

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Main PCB Assembly ISA1350 continued

QSC Part # Description Qty. Reference Comments

RE-063404-GP 634 OHMS 1% 1/8W 1206 2 R123, R127 RE-078702-GP 787 1% 1/10W THICK FILM 0805 1 R135 RE-082007-GP 820 1% 1/10W THK FLM 0805 2 R3, R4 RE-082008-GP 820 1% 1/8W THK FLM 1206 200V 4 R141, R203, R204, R221 RE-111801-GP 1.18K, 1 PCNT, 1/10W, RMG, 0805, 2 R50, R112 RE-112001-GP RMG 1/10W 1.2K 1% 0805 1 R111 RE-115006-GP 1.5K 1% 1/8W THK FLM 1206 3 R23, R26, R27 RE-115008-GP 1.5K, 1 PCNT, 1/10W, THK FLM, 0805, 100V 1 R211 RE-116902-GP 1.69K 1% 1/4W AT 1 R19 RE-122009-GP RMG 1/10W 2.2K 1% 0805 2 R218, R227 RE-122010-GP 2.2K 1% 1/10W THK FM 0805 100V 1 R24 RE-130004-GP RMG 1/8W 3K 1% 1206 1 R290 RE-130103-GP RMG 1/10W 3.01K 1% 0805 10 R125, R126, R131, R132, R137, R138, R139, R205, R212, R215 RE-147002-GP 4.7K 1% 1/10W THK FLM 0805 10 R129, R174–R177, R188, R189, R191, R192, R250 RE-159003-GP 5.9K 1% 1/10W THK FLM 0805 5 R16, R161, R166, R206, R214 RE-164901-GP 6.49K, 1 PCNT, 1/10W, RMG, 0805, 1 R115 RE-175004-GP 7.5K 1% 1/10W THK FM 0805 100V 3 R119, R140, R144 RE-190903-GP RMF 1/2W 9.09K 1% AT 2 R148, R151 RE-210007-GP 10K 1% 1/10W THK FLM 0805 7 R20, R28, R53, R101, R102, R186, R187 RE-211001-GP RMG 1/10W 11K 1% 0805 1 R281 RE-212003-GP 12K 1% 1/10W THK FLM 0805 100V 8 R1, R2, R145, R146, R219, R225, R226, R231 RE-212105-GP 12.1K, 1 PCNT, 1/10W, RMG, 0805, 1 R280 RE-213304-GP RMF 1/2W 13.3K 1% AT 2 R149, R154 RE-215007-GP RMF 1W 15K 5% METAL 1 R255 RE-215402-GP 15.4K, 1 PCNT, 1/10W, RMG, 0805, 4 R55–R58 RE-220005-GP RMG 1/10W 20K 1% 0805 5 R104, R105, R106, R108, R232 RE-221002-GP RMG 1/10W 21K 1% 0805 1 R52 RE-222001-GP 22K 1% 1/10W 0805 1 R30 RE-223202-GP RMF 1/2W 23.2K 1% AT 1 R270 RE-224001-GP 24.0K 1% 1/10W THK FLM 0805 3 R29, R130, R136 RE-227001-GP 27K 1% 1/10W 0805 1 R143 RE-239002-GP 39K 5% 1W METAL FILM 1 R213 RE-239003-GP 39K, 1 PCNT, 1/10W, MET FLM, 0805, 100V 3 R116, R207, R208 RE-247006-GP 47K 1% 1/10W THK FLM 0805 100V 8 R17, R18, R133, R185, R190, R264, R265, R267 RE-310007-GP 100K 1% 1/10W THK FLM 0805 2 R103, R238 RE-310008-GP 100K 1% 1/8W THK FLM 1206 18 R109, R110, R155–R158, R162–R165, R167–R170, R179–R182 RE-315004-GP RMG 1/8W 150K 1% 1206 3 R113, R114, R142 RE-318001-GP 180K 1% 1/4W METAL FILM 1 R14 RE-318002-GP 180K 1% 1/8W THK FLM 1206 1 R13 RE-346401-GP 464K 1% 1/8W THK FLM 1206 3 R15, R21, R147 RE-346402-GP 464K 1% 1/10W THK FLM 0805 50V 5 R193–R196, R220 RE-349901-GP 499K 1% 1/8W THICK FILM 1206 1 R134 SC-000018-GP BOLT, PHILLIPS, , , , 1 SC-030001-GP BH M3 X 10MM BZ CRD, B-TITE 4 SC-030002-GP M3 B-TITE FLAT-CS 1 SC-030004-GP M3 X 8 BLK MACHINE 8 SC-030005-GP M3 X 12MM (BLK/ZINC) 1 SC-030007-GP M3 X 6MM B-TITE BLK ZN 3 Q6, Q110, Q111 SC-030011-GP M3 X 8 MM NICKEL 2 SC-040002-GP SCREW, M4X10(H) BLK, ZN, SERRATED 3 SC-040007-GP PHILLIPS, SERRATED M4X20L BLK 1 SC-040008-GP P/P, M4, 10MM, BLK, TRIANGULAR TIP 1 SW-000089-GP 10 POLE DIP SWITCH 1 SW1 SW-000091-GP CIRCUIT BREAKER 15A 1 SW-000097-GP DPST, 20A, 125VAC 1 TD-000136-00 SRV - OWNERS MANUAL, ISATI/ISA SERIES(NEW) 1 TD-000900-AX WARRANTY CARD, GENERIC, 1 TS-000004-WR 3 YEARS WARRANTY 3 WC-0.6023-GP 0.6 JUMPER 23AWG 16 J34–J45, J53–J56 WC-000181-GP AC CORD 15A ISA 1

Technical Service Manual 69 ISA Series Power Amplifiers

Main PCB Assembly ISA1350 continued

QSC Part # Description Qty. Reference Comments

WC-000183-GP SLEEVE .7086 2 R7, R8 WC-000184-GP SLEEVE 1MM 3 R25, D106, D107 WC-000188-GP SLEEVE, PVC, 5MM ID, BLK 3 WC-000189-GP SHRINKAGE TUBE ID=14MM 1 WC-000284-GP WIRE ASSY W/2T L=600MM 1 WC-000285-GP WIRE CONN ASSY W/6 SINGLE 1 WC-000287-GP GND WIRE UL 10015 #14 1 WC-000288-GP WIRE ASSY, 14AWG, 210MM, L, BRN 1 WC-000289-GP WIRE ASSY, 14AWG, 600MM L, BLU 1 WC-000290-GP WIRE ASSY, 28AWG, 7COND, 140MM L. 1 WC-000292-GP CABLE ASSY RIBBON 28PIN 1 WC-000295-GP WIRE ASSY, GRAY 60MM 1 WC-000329-GP SHRINKAGE TUBE ID=12 UL/CSA 1 WC-000330-GP WIRE ASSY W/2T L-600MM #14 BRN 1 WC-000331-GP WIRE ASSY W/3T L=490/100 #14 1 WC-000332-GP WIRE ASSY W/3T L-560/100 #14 1 WC-000333-GP WIRE ASSY W/2T L=260 #14 BRN 1 WC-000334-GP WIRE ASSY W/2T L-220 #14 BRN 1 WC-000335-GP WIRE ASSY W/2T L-520 #14 GRY 1 WC-000336-GP CABLE ASSY RIBBON 24PIN IEC 1 WC-000337-GP CONN ASSY 3P P2.5 L-160 26AWG 1 XF-000190-GP SPRING COIL 2UH (14GA WIRE) 1 L101

PCB Assembly, AC/Input ISA

120V: QSC part # WP-*****2-00 230V: QSC part # WP-*****2-02

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7. Schematics and diagrams

7.1 ISA Series Chassis Assemblies

Chassis assembly, ISA280

Technical Service Manual 71 ISA Series Power Amplifiers

Chassis assembly, ISA280 & ISA300T

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Chassis assembly, ISA300T

M4 X 20MM

46?

Technical Service Manual 73 ISA Series Power Amplifiers

Chassis assembly, ISA300Ti

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Chassis assembly, ISA300Ti

Technical Service Manual 75 ISA Series Power Amplifiers

Chassis assembly, ISA450

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Chassis assembly, ISA450

Technical Service Manual 77 ISA Series Power Amplifiers

Chassis assembly, ISA500T

M4 X 20MM

46?

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Chassis assembly, ISA500T & ISA500Ti

Technical Service Manual 79 ISA Series Power Amplifiers

Chassis assembly, ISA500Ti

M4 X 20MM

46?

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Chassis assembly, ISA750

Technical Service Manual 81 ISA Series Power Amplifiers

Chassis assembly, ISA750

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Chassis assembly, ISA800T

M4 X 20MM

46?

Technical Service Manual 83 ISA Series Power Amplifiers

Chassis assembly, ISA800T

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Chassis assembly, ISA800Ti

Technical Service Manual 85 ISA Series Power Amplifiers

Chassis assembly, ISA800Ti

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Chassis assembly, ISA1350

Technical Service Manual 87 ISA Series Power Amplifiers

Chassis assembly, ISA1350

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Chassis assembly, ISA1350

Technical Service Manual 89 ISA Series Power Amplifiers

Chassis assembly, ISA1350

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Technical Service Manual 91 ISA Series Power Amplifiers

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Technical Service Manual 93 ISA Series Power Amplifiers

7.2 ISA280 (1st generation) Schematics

Gray shading indicates signal path

ISA 280

Early version page 1 of 3

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ISA 280

Gray shading indicates signal path

Early version page 2 of 3

Technical Service Manual 95 ISA Series Power Amplifiers

ISA 280

Early version page 3 of 3

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7.3 ISA280 (revised) Schematics

Gray shading indicates signal path

ISA 280

Revised version (March 2003) page 1 of 3

Technical Service Manual 97 ISA Series Power Amplifiers

ISA 280

Gray shading indicates signal path

Revised version

(March 2003)

page 2 of 3

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