Harman Kardon Signature 1.5 Service Manual

Signature 1.5

Two Channel Amplifier

TECHNICAL MANUAL

Harman Consumer Group
250 Crossways Park Drive
Woodbury, N.Y. 11797
1-800 645-7484 in the USA

A Harman International Company

Part No.: 1112-SIGNATURE1.5 Rev A 7/99

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

TABLE OF CONTENTS

SPECIFICATIONS....................................................................1

Signature 1.5 FRONT PANEL CONTROLS............................2

FEATURES ..............................................................................2

REAR PANEL CONNECTIONS...............................................3

INSTALLATION........................................................................4

OPERATION ............................................................................6

IDLE CURRENT ADJUSTMENT FOR SIGNATURE 1.5.......6

OUTPUT TRANSISTOR REPLACEMENT ..............................6

ON THE SIGNATURE 1.5

TROUBLE SHOOTING............................................................7

PROTECT MODE ....................................................................7

Signature 1.5 MECHANICAL EXPLODED VIEW....................8

Signature 1.5 MECHANICAL PARTS LIST.............................9

SPECIFICATIONS

Signature 1.5 PACKING EXPLODED VIEW ...........................9

Signature 1.5 POWER SWITCH/INDICATOR PCBs .............10

Signature 1.5 POWER AMPLIFIER PCB Rev B....................11

Signature 1.5 Electrical Parts List ..........................................12

Signature 1.5 (120V) TRANSFORMER WIRING Rev A........14

Signature 1.5 (120V) TRANSFORMER WIRING Rev B........15

Signature 1.5 (230V) TRANSFORMER WIRING Rev A........16

Signature 1.5 (230V) TRANSFORMER WIRING Rev B........17

INTEGRATED CIRCUITS.......................................................18

Signature 1.5 POWER SWITCH/INDICATOR........................19

SCHEMATIC (1 of 1)

Signature 1.5 POWER AMP SCHEMATIC (1 of 2) ...............20

Signature 1.5 POWER AMP SCHEMATIC (2 of 2) ...............21

Power Requirements:

120V version: ...............120VAC, 50/60Hz

230V version: ...............230VAC, 50Hz

Power Output: ...................2x200watts @8 ohms

20Hz - 20kHz, <0.03% THD, Both Channels Driven
1 x 700watts @ 8 ohms
20Hz - 20kHz, <0.03% THD, Bridged Mono Mode
2 x 350 watts @ 4 ohms
20Hz - 20kHz, <0.03% THD, Both Channels Driven

High-Current Capability: ............130Amps

Frequency Response: ..............<1Hz - >170kHz ±3dB

Power Bandwidth: ................<5Hz - >160kHz

THD/IMD: ......................<0.03% at rated output

Crosstalk ......................>-87 dBr between any two channels at maximum output

Negative Feedback: ...............<25dB

Input Impedance: .................33Kohms

Input Sensitivity: .................1volt for rated output

Remote Trigger Voltage: ............6-12volts DC (tip of plug must be “positive”(+))

Remote Trigger Impedance: .........20Kohms

Dimensions (H xWxD):...........7½x17¼x15¼inches

191 x 438 x 387 mm

Weight:........................47lbs/21 kg

1

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

FEATURES

The Harman Kardon Signature 1.5 is a flexible, state-of-the-art audio power amplifier designed to deliver high
performance for use in home theater or music reproduction applications. The following are among its many
features:

Designed and manufactured in the United

n

States

High-current output capability

n

Two channels with bridgeable outputs

n

Ultrawide bandwidth design

n

Low negative feedback

n

Signature 1.5 FRONT PANEL CONTROLS

harman/kardon

1.5

Low harmonic and intermodulation distortion

n

Massive heat sinks for quiet convection cooling

n

High-current power supply

n

Remote turn-on/turn-off circuitry with select

n

Signature Series and Harman Kardon products
or through optional accessories.

On/Off

S

123

1 Power Switch: Press this switch to turn the 1.5 on for
manual operation, or to place it in the Standby mode for
automatic/remote turn-on when the 1.5 is connected to a
device with a compatible trigger circuit.

Note: Even when the Power Switch is off, the unit is still
connected to the AC power supply.

2 Power-On Indicator: When the word SIGNATURE is
illuminated in blue, the 1.5 is in a normal operating
condition.

IGNATURE

series

3 LED Indicator: The color of this indicator varies with the
status of the 1.5. It is red when the unit is off and in Manual
Operation, amber in the Standby mode, and flashing green
during Warm-Up. If the indicator flashes and alternates
between red and amber, the 1.5 is in the Protect mode,
indicating a problem in the unit or connections to the
speakers.

2

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

REAR PANEL CONNECTIONS

CHANNEL ONE (RIGHT) CHANNEL TWO (LEFT BRIDGE)

SPEAKER SPEAKER

4MINW 4MINW

12

IN IN

BRIDGE

NORMAL

()BRIDGE()

8MINW

678 910 115

5 Channel One Output: When the amplifier is being used in
the two-channel (Stereo) mode, connect the right channel
speaker to the positive (+) and negative (-) terminals. When
the amplifier is being used in the Bridged Mono mode
connect the Positive (+) terminal ONLY to the Negative (-)
terminal on your speaker.

6 Channel One Input: When the amplifier is being used in
the two-channel (Stereo) mode, connect the right channel
output of your preamp or processor to this input jack. When
the amplifier is being used in the Bridged Mono mode, this
jack is not used.

7 Bridge/ Normal Switch: When the amplifier is used for
two-channel stereo operation, this switch should be in the
NORMAL position. For Bridged Mono use only, place the
switch in the BRIDGE position.

8 Channel Two Output: When the amplifier is being used
in the two-channel (Stereo) mode, connect the left channel
speaker to the positive (+) and negative (-) terminals.

POWER AMP
TRIGGER IN

BRIDGE IN

AC INPUT

AC 120V/60Hz 600W

9 Channel Two/ Bridged Input: When the amplifier is
being used in the two-channel (Stereo) mode, connect the
left channel output of your preamp or processor to this input
jack. When the amplifier is being used in the Bridged Mono
mode, connect the output of your preamplifier or other
line-level signal source to this jack.

10 Power Amp Trigger Input: Connect this jack to a
matching 6- to 12-VDC trigger output on a compatible
device to have the 1.5 automatically turn on from the
Standby mode when voltage is applied from the triggering
unit. Note that a 3.5mm mono mini-plug with a positive tip
should be used for the connection.

11 AC Power Cord: Connect this plug to a non-switched
AC outlet. Due to the high-current draw of the Signature 1.5,
it is NOT recommended that the accessory outputs on the
back of audio/video components be used to power this
product.

When the amplifier is being used in the Bridged Mono mode
connect the Positive (+) terminal ONLY to the Positive (+)
terminal on your speaker.

Important Note: When the 1.5 is used in the Bridged Mono
mode, do not connect a speaker with an impedance less
than 8 ohms.

3

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

INSTALLATION

Note: When making any connections between source

components, processors or preamplifiers and the 1.5, or
when making any connections to speakers, be certain that
both the input device and the 1.5 are turned off. To ensure
that there will be no unwanted signal transients that can
damage equipment or speakers, it is always best to unplug
all equipment from AC power outlets before making any
connections. Modern electronic products often have a
“standby” mode that may be activated even though the
product may appear to be turned off.

Power Control Connections

The Signature Series 1.5 amplifier features a built-in remote
turn-on system that will automatically turn on the amplifier
when another device in the system is switched on. To
activate this system, this amplifier must be used in
conjunction with compatible Signature Series or Harman
Kardon products or other approved devices.

Note: Before making any connections to remote trigger
outlets, it is critical that both the 1.5 and the triggering
device be turned off. For additional safety, it is best that
these connections be made while both products are
unplugged from AC power sources.

Remote Turn-On with the Signature Series 2.0 and
Compatible Harman Kardon Products

Connect one end of the accessory cable supplied with the

2.0 to the Power Amp Trigger In jack on the rear of the

1.5. Connect the other end to the TRIGGER OUTPUT jack
on the 2.0.

Remote Turn-On Using an External AC-to-DC Converter

If the 1.5 is not used with a compatible Harman Kardon
product, it is still possible to activate the unit for automatic
turn-on.

To control the amplifier in this manner you will need a small
UL/CSA-approved class-2 AC-to-DC power converter
capable of delivering a 6- to 12-volt DC signal. The DC
voltage should terminate in a standard 3.5 mm mono

miniplug, with the tip of the plug “positive” (
converter may be obtained as a “Power Adapter” from many
electronics retailers. Consult your dealer for further
information.

10

+). This type of

Connect the 3.5 mm miniplug from the power converter to
the Power Amp Trigger In jack on the rear of the 1.5.

10

Audio System Connections

As a general rule, avoid running any input signal or speaker
wire connections next to or parallel with AC power cords.
This may cause undesired hum or other interference that
will greatly degrade signal performance.

When making input connections with RCA-type plugs on
interconnect cables, make certain to gently but firmly insert
the plugs into the jacks on the rear of the 1.5. Loose
connections can cause intermittent sound and may damage
your speakers.

Input Connections

Stereo Mode: For conventional two-channel stereo
operation, connect the right channel output of your pre-amp

or processor to the Channel One Input and the left
channel output to the Channel Two Input . Make certain
that the Bridge/ Normal Switch is in the NORMAL

position.

Bridged Mono Mode: To use the 1.5 as a single-channel,
mono amplifier, connect the line-level output of your
preamp, processor or other signal source to the Channel

Two/ Bridged Input connector on the rear panel. No
connection is required to the Channel One connector in this

mode. Make certain that the Bridge/ Normal Switch is
in the BRIDGE position.

7

9

Output Connections

The final step of the installation process is to connect the
amplifier to your speakers using high-quality cable. A pair of
binding posts is provided for each channel output. These
posts will accept bare wire or banana-type plugs. To ensure
that the high-quality signals produced by the 1.5 are carried
to your speakers without loss of clarity or resolution, we
recommend that you use high-quality speaker cable. Many
brands of cable are available, and the choice of cable may
be influenced by the distance between your speakers and
the amplifier, the type of speakers you use, personal
preferences and other factors. Your dealer or installer is a
valuable resource to consult in selecting a proper cable for
connections between your amplifier and speakers.

6

9

7

Plug the AC adapter into a switched outlet that will be
activated when you wish to have the amplifier turn on. This
may be the switched outlet at the rear of an AV receiver or
other audio equipment, an AC outlet that is part of a current
sensing control unit activated by a pre-amp or surround
processor or a switched AC wall outlet.

Regardless of the brand or type of cable selected, we
recommend that you use a cable constructed of
high-strand-count copper with a gauge of 14 or smaller.
When specifying cable, remember that the smaller the
number, the thicker the cable.

4

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Cable with a gauge of 16 may be used for short runs of less
than ten feet. We do not recommend the use of cables with
an AWG equivalent of 18 or higher due to the power loss
and degradation in performance that will occur.

Cables run inside walls should have the appropriate
markings to indicate listing with UL (“CL-2/CL-3”), CSA
(“FT-4”) or appropriate safety agency standards that may be
required in your area. Questions about running cables
inside walls should be referred to your installer or a licensed
electrical contractor who is familiar with the NEC and/or the
applicable building or electrical codes in your area.

Two-Channel/Stereo Systems: When installing a
two-channel (stereo) system, connect the positive (+) and
negative (-) terminals from the right and left speakers to the

5

matching terminals on the rear panel of the 1.5. Make
certain that the Bridge/Normal Switch is in the

NORMAL position. When the 1.5 is used for
two-channel/stereo operation, speakers with an impedance
of no less than 4 ohms may be used.

Bridged Mono Applications: To use the 1.5 as a
single-channel, mono amplifier, connect the (+) terminal on
your speaker to the (+) terminal on the Channel Two

Output on the 1.5. Connect the negative (-) terminal on
your speaker to the positive (+) terminal on the Channel

One Output .

Note: For mono applications, no connections are made to
the negative (-) speaker output terminals on the 1.5. Make

certain that the Bridge/Normal Switch is in the BRIDGE
position.

Important Note: When the 1.5 is used in the Bridged Mono
mode, do not use speakers with an impedance of less than
8 ohms.

8

5

8

7

7

holes at the rear of the terminal. Making certain that you
observe the correct polarity for the type of system being
installed (Stereo or Bridged Mono), pass the exposed wire
through the hole until the wire is visible from the bottom end.
Holding the wire in place, twist the cap back so that the
connection is secured. Do not overtighten or use tools, as
this may damage the plastic terminal cap or break the
delicate wire strands and decrease system performance.

Important Note: When making speaker wire connections,
be certain that none of the strands from one lead touch any
other lead. This will cause a short circuit and may damage
your amplifier or speakers. Damage from short circuits
caused in this manner is not covered by the product
warranty.

Connections may also be made using spade lugs or
standard 4 mm OD banana plugs. Before using a
banana-type jack, make certain that the plastic screw caps
on the 1.5 are firmly tightened by turning them clockwise
until they are snug against the chassis. This will ensure that
the maximum surface area of the plug is in contact with the
jack. Once the wire has been attached to the banana plug
following the plug manufacturer’s instructions, simply insert
the banana plug into the hole provided on the rear of the
colored screw caps on the terminal posts. Be certain to
observe proper polarity.

Finally, run the cables to the speaker locations. It is highly
recommended that the length of cable connecting any pair
of speakers be identical. For example, make certain that the
cable length connecting left and right front or left and right
rear (surround) speakers is identical, even though one
speaker may be physically closer to the amplifier than the
other. Do not coil any excess cable, as this may become an
inductor that creates frequency response variations in your
system.

When making speaker connections, note that one
conductor of the speaker cable may have no markings or an
indication of (-) for negative polarity, and the other will have
a red line, brand-name markings, a colored thread or some

other positive-polarity indication (

The wire with the positive indication should be connected to
the red terminals on both the 1.5 and your speakers. The
negative wire should be connected to the black terminal on
the 1.5 and the speakers.

If bare wire is used for connections, strip approximately
3/4”(20 mm) of insulation from the end of each wire and
carefully twist the strands of each conductor together. Be
careful not to cut the individual strands or twist them off; for
optimal performance, all strands must be used.

Next, loosen the knobs of the speaker output terminals far
enough so that the cap moves back on its threads past the

+).

Connect the wires to the speakers, again being certain to
observe proper polarity. Remember to connect the negative
or black wire to the matching terminal on the speaker.
Similarly, the positive or red wire should be connected to the
like terminal on the speaker.

Note: While most speaker manufacturers adhere to an
industry standard of using black terminals for negative and
red ones for positive, some manufacturers may not adhere
to this configuration. To ensure properly phased
connections and optimal performance, consult the
identification plate on your speaker terminals, or the
speaker’s manual to verify polarity. If you do not know the
polarity of your speaker, ask your dealer or installer for
advice before proceeding, or consult the speaker’s
manufacturer.

5

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

OPERATION

The Signature 1.5 may be operated in either a manual or
automatic mode. If the unit is being used in a stand-alone
operation you should follow the instructions below for
Manual Operation. When the Signature 1.5 is connected to
another compatible device such as the Signature 2.0 or
PT2500 tuner, follow the instructions for Automatic
Operation.

Make sure the power switch is in the off position before
plugging in the AC power cord. After all the connections
have been made to the amplifier’s input jacks and speaker
terminals, connect the power cord to an AC outlet. Turn on
your source component and receiver/processor first; start
with a low volume level to protect your speakers.

Manual Operation

The LED indicator should be glowing red if the unit is
plugged in. Press the front panel switch to turn the unit on.

The indicator will flash green briefly, and then go out; the
front panel will then illuminate to blue.

To turn the unit off, press the power switch again. The LED
indicator will return to red.

Automatic Operation

Before proceeding, make certain the connection between
the Signature 2.0, PT2500, or other trigger source has been
connected properly to the unit following the previous
directions. At this point the trigger source should be off.

After all cables are connected and the Signature 1.5 is
plugged in, the LED Indicator should be glowing red. Press
the power switch and the indicator will turn amber indicating
the unit is in the standby mode and ready to turn on when it
receives a signal from the triggering device. Finally, turn on
your Signature 2.0, PT2500, or other trigger source to turn
the Signature 1.5 on.

The indicator will flash green briefly, and then go out; the
front panel will then illuminate to blue.

At the conclusion of your listening session, there is no need
to turn the Signature 1.5 off manually. When the Signature

2.0, PT2500, or other trigger source is turned off, the
Signature 1.5 will return to the standby mode.

Important Note: If you will not be using your audio
system for an extended period of time, such as a vacation,
we recommend turning the Signature 1.5 off using the
power switch.

IDLE CURRENT ADJUSTMENT FOR SIGNATURE 1.5

Locate test points P4 and P5; these are 2 pin female molex connectors (2 total, 1 per channel) on the MAIN AMPLIFIER PCB
near the speaker terminals.

Attach a DC voltmeter (set to a low range) to these points. This is best accomplished by making up a “test plug” using a male
molex connector that fits into the one in the unit, with wires attached, for connection to the voltmeter. An alternate method is to
use two “mini-grabbers” to attach to the two outer pins on each connection. Warning: Do not accidentally short the two points
together with a meter probe during adjustment.

Adjustment Points: R60, R69

Adjust to 18mv across test points, one channel at a time, until both channels comply.

OUTPUT TRANSISTOR REPLACEMENT ON THE SIGNATURE 1.5

1) Remove the top cover.

2) Remove all molex connectors on the main amplifier board.

3) Remove the (4) outer screws holding the heatsink plate to the chassis.

4) Remove all outer Philips screws holding both speaker terminals and RCA connectors to the rear panel.

5) Angle and lift the entire amplifier assembly and heatsink up and out of the chassis.

6

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

PROTECT MODE

Input/Output Protection

Under some conditions, such as a shorted speaker wire, DC
voltage on an input connection or thermal overload, the
amplifier will place itself in a “protect mode” to prevent
damage to the amplifier. When this happens, the LED
Power Indicator will flash and alternate between red and
amber.

When this occurs, IMMEDIATELY turn off the unit using the
power switch and correct the problem. Then turn the unit
back on. If the unit continues to go into protect mode,
contact your dealer or installer for assistance.

TROUBLE SHOOTING

The items listed below are a brief guide to minor problems that may arise with audio equipment such as the Signature 1.5.
Before taking a unit in for service, you should check to see if any of these hints solve the problem. If these solutions do not
rectify the problem or if the problem recurs, contact your dealer or an authorized Harman kardon service depot for assistance.

PROBLEM DIAGNOSIS TROUBLESHOOTING HINTS

Amplifier will not turn on. n Power Switch turned off. n Turn on Power Switch

(No Power Light LED)

n Remote trigger cable not n Verify connection of trigger cable

properly connected. at both ends

Amplifier turns on, but no audio n Inputs not connected to n Check input connections.
From One or more channels proper jack.

n Speakers not connected n Check speaker connections.

Properly.

n Improper settings or output n Check the settings on your preamp,

levels from processor or processor or controller.
Controller.

Audio plays, then cuts off. n Amplifier shorted n Check speaker connections for

(LED flashes amber and red). Short circuit.

7

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 MECHANICAL EXPLODED VIEW

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Signature 1.5
Mechanical Exploded View

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DESCRIPTION & PART NO.

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BOLT 4-40 5/16 PHP CAP
111-D051-0

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BOLT 4-40 5/8 PHP CAD
111-0101-0

3

SCREW 4AB 1/2 PHP B.Z.
111-3080-0

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TR-BOLT 4-40 3/8 PHP CAD
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TR-BOLT 4-40 1/2 PHP CAD
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WASHER #6 SPILT ZINC
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POWER CORD, 2x18-16 GA,SPT-2,UL,CSA
A095-0002-0 (FOR 120V VERSION)
A095-0009-0 (FOR 230V VERSION)

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Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 MECHANICAL PARTS LIST

Ref. # Part # Description Qty

11 100-0008-0 STRAIN RELIEF, SJT, BLK, UL, CSA 1

12 A095-0015-0 CORD, 2X16GA, RND, 8FT, 13A, 250V, DOM 1

13 101-0002-0 FOOT BLACK ANODIZED/RUBBER GASKET 4

14 HA132-0014-B SIG 1.5 TOP COVER 1

15 HA132-0009-A SIG 1.5, FIN PLATE 28

16 HA132-0016-B SIG 1.5 SINK PLATE 1

17 HA132-0021-A LOGO, SIGNATURE SERIES, ACRYLIC 1

18 HA132-0030-A SIG 1.5, FRONT PANEL 1

19 HA132-0032-B SIG 1.5 REAR PANEL, 120V 1

T1 A080-0025-A POWER TRANSFORMER 120V 1

A095-0009-0 POWER TRANSFORMER 230V 1

A095-0500-0 WIRE, 14GA, BLACK, 600V 1

A095-1002-0 WIRE 25 AWG, BLK, 7 STRAND, UL1061 1 1

100-0035-0 CABLE TIE, BLACK, 4"-18 LB 8

100-0126-0 HOLDER, CABLE TIE .75" SQUARE, ADHE 5

102-0003-0 BUTTON CAP, LOUDNESS, H/K 1

105-0005-0 INSULATOR, 9MIL, TO-126, GRY, GREASLE 4

105-0009-0 INSULATOR TAPE, 3/4"X7 MIL ADHESIVE 4

111-0051-0 BOLT, 4-40, 5/16, PHP, CAD 4

111-0101-0 BOLT, 4-40, 5/8, PHP, CAD. 16

111-3080-0 SCREW, 4AB, ½, PHP, B.Z. 2

111-7011-0 WASHER, #4, SPLIT 82

111-8061-0 TR-BOLT, 4-40, 3/8, PHP, CAD 38

111-8081-0 TR-BOLT, 4-40, ½, PHP, CAD 24

112-0040-0 BOLT, 6-32, 1/4, PHP, ZINC 4

112-3080-0 SCREW, 6AB, ½, PHP, B.Z. 2

112-7001-0 WASHER, #6, FLAT, CAD 4

112-7021-0 WASHER, #6, SPLIT ZINC 4

112-8050-0 TR-BOLT, 6-32, 5/16, PHP, BO 27

153-0000-0 TIE WRAP, BLACK 1

153-0100-1 SAFETY LABEL(RISK OF FIRE), FAST F 1

120-0002-1 ALUM .080, 5052-H32, 6.00X5.15 +/- 1

120-0012-0 STEEL, 20 GA.036 EGC 48X120 615

HA132-0015-B SIG 1.5 CROSS BRACE 1

120-0008-0 STEEL, 16 GA.EGC. 48X120 198

129-0003-A PA5800 SINK PLATE BLANK 16.7000" 1

HA132-0031-B SIG 1.5 CHASSIS 1

111-6036-0 NUT, PEM, S-440-1 FOR .040 MIN. THK 4

112-6009-0 STANDOFF, SO-6440-24 12

120-0019-0 STEEL, 18 GA.EGC .047 48X120 FPR 480

120-0019-0 STEEL, 18 GA.EGC .047 48X120 FPR 198

HA153-0106-0 LABEL, UPC, 120V, SIG 1.5 2

HA202-0003-A WIRE ASSY, 26GA, BLK, 9", 2PIN, UL/CSA 1

A093-1000-0 HSG, 2MMX2, 26GA, IDC 2

A095-1002-0 WIRE 26 AWG, BLK, 7 STRAND, UL1061 1 1

HA202-0004-A WIRE ASSY, 26GA, BLK, 7", 7PIN, UL/CSA 1

A093-2500-0 HSG, 2MMX7, 26GA, IDC 1

A095-1002-0 WIRE 26 AWG, BLK, 7 STRAND, UL1061 1 1

HA202-0005-A WIRE ASSY, 26GA, BLK, 18.5", 5PIN, UL/ 1

A093-1003-0 HSG, 2MMX5, 26GA, IDC 2

A095-1002-0 WIRE 26 AWG, BLK, 7 STRAND, UL1061 1 1

Signature 1.5 PACKING EXPLODED VIEW

Ref.# Part # Description Qty 50 HA150-0003-A SIGNATURE 1.5 CARTON 1

51

56
52
53
54
57

51 HA151-0002-A SIGNATURE 1.5 FOAM PACK 1

52 HA160-0001-A HARMAN WARRANTY SHEET 1

53 HA160-0002-A HARMAN CUSTOMER CARD 1

54 HA160-0005-A SIGNATURE 1.5 OWNER’S MANUAL 1

55 150-0089-0 BAG POLY 24X30 3 MIL WITH VENT HO 1

56 150-0103-0 BAG, PLOY 9"X12"X2MIL CLEAR 1

57 160-0005-0 GROUNDING SAFETY SHEET 1

55

51

50

9

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER SWITCH/INDICATOR PCBs

D3D2D4

Q3

C10

P4

RED

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C3

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C
B
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C12

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R8

R19

C

C4

C11

C14

S4

D25

D24

D23

D22

D21

D20

D26

D19

D18

D17

S3

P6

P2

R20

Q5

D16

R2

Q7

D8

B

P3

R3

D28

Q6

R16

E

Q2

R17

BRN

RED

B

C

S1

C6

+

C8

+
C
B
E

D14

R12

R18

C13

BLUE

D1

C2

R5

C9

R13

U2

T1

P

C1

K2

TH1

F2

D10

D11

D9

C5

U1

R6

S2

C
B
E

C

C

B

B

Q8

E

E

R15

A

P1

/

UL CSA:

10A 125V

5A 250V

1

EUROPE:

F1

K1

2

HARMAN

HA206-0003-C

3

Q4

GALLIEN TECH

HA145-0003-C

0.5A 250V

C
B

Q1

D5

D6

C
B
E

D12

P5

R4

D13

+

R9

C7

D7

E

R1

R22

R21

D27

R11

R10

D15

R14

D

SIG 1.5
POWER SWITCH/
INDICATOR BOARD

Rev D

HA145-0003-D

E

1

2

3

4

F1

K1

P1

/

UL CSA:
EUROPE:

P2

10A 125V
5A 250V

T1

P

C1

K2

P3

BRN

RED

P4

RED

BLUE

S

S4

D25

SIG 1.5
POWER SWITCH/

5

TH1

R20

Q7

D16

R2

D8

U1

C
B
E

0.5A 250V

D9

D10

S2

Q8

C
B
E

R15

C3

D3

D2

D4

D1

C2

Q2

E

B

C

C5

R3

D11

R6

Q6

C
B
E

D28

R16

R17

C
B
E

S1

R18

+

+

D14

C13

C6

R12

C8

R13

R5

C9

U2

C10

+

C
B

Q3

E

R8

+

+

R19

HARMAN
HA206-0003-B9

Q1

D5

6

7

D6

C
B
E

D13

D12

Q4

R4

P5

GALLIEN TECH

HA145-0003-B9

R9

F2

C
B

D7

E

R1

R22

R21

+

C7

Q5

D27

R11

R10

R14

D15

C4

C11

C12

C14

D22 D23 D24

D21

D26

D19 D20D18

D17

S3

P6

INDICATOR BOARD

Rev B9

HA405-0003-B9

4

5

6

7

A

B

C

D

E

10

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER AMPLIFIER PCB Rev B

C1

R4

EC

B

EC

R16

R24

D3

Q4

Q12

X1

P1

R20

C2

F1

F3

T 6.3A/250V

Q5

Q13

C3

C4

C5

X2

C9

C12

BR1

-

AC +

R1

R2

C13

R6

CEB

Q1

R7

R8

R9

D1

D4

R17

B

EC

EC

B

Q6

R21

Q7

B

EC

TH1

R25

B

EC

Q14

Q15

B

R5

D5

P2

R18

EC

Q8

B

R26

EC

Q16

X3X4

C6

C7

C10

F2

T 6.3A/250V

F4

-

AC +

BR2

R19

Q9

B

EC

EC

B

R22

R27

Q17

B

EC

GALLIEN TECHNOLOGY
HA145-0004-B

R3

C14

D6

Q10

R23

Q18

C8

C11

R10

R11

Q2

CEB

R12

R13

Q11

Q19

D2

CEB

Q3

C15

R14

P3

R15

B

EC

B

Q28

EBC

R107

B

EC

B

R32

R108

R28

EC

B

R29

EC

B

R33

Q20

R36

L1

R40

Q38

CEB

RL1

C39

X9X10

R109

C42

J1

R41

P4

Q21

Q29

R46

B

EC

C16

R47

R60

D8

CEB

Q45

R87

Q50

CEB

R113

R88

C44

R66

Q46

R89

C30

Q51

R114

R42

D9

CEB

CEB

R115

Q23

R67

R90

R116

R68

R91

EBC

L2

R79

C40

+-

B

EC

Q32

K1

EC

B

Q33

EBC

R110

R80

X6

EC

Q22

B

Q31

Q30

EBC

EBC

R37

EBC

R48

R52

R51

R50

Q39

R84

C43

X5

CEB

R49

Q42

C27

C20

C36

Q54

Q56

C18

+

+

CEB

CEB

CEB

C21

D15

J4

R78

R100

R61

C22

C28

R101

T

R63

R62

Q44

R82

T

G

R64

CEB

+-

TS

R65

D7

C29

R86

R34

R111

RL2

R112

J2

Q24

L3

C41

R30

R38

R43

Q40

CEB

C45

R44

P5

Q25

Q34

R53

EC

B

EC

C17

R54

R69

EBC

R55

Q43

R85

C46

X7

Q35

EBC

R57

R56

CEB

C23

C32

R58

R59

C37

Q55

Q36

C19

+

+

CEB

CEB

Q57

B

EC

B

Q41

CEB

C24

D16

J5

EBC

R81

R102

R35

R70

R103

C25

R83

C33

T

R72

R71

Q47

T

G

Q26

R73

CEB

+-

TS

R39

D10

R74

C34

R94

R31

D11

Q48

CEB

R95

Q52

CEB

EC

Q27

B

EC

Q37

R45

L4

EBC

R75

D12

R77

R76

Q49

CEB

HARMAN

HA206-0004-B

C38

R120

R104

+-

X8

J3

R105

R106

TS
T

G

R98

R97

C35

R96

R99

Q53

CEB

C47

R119

R117

R118

REDBLK

REDBLK

11

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 Electrical Parts List

POWER SWITCH/INDICATOR BOARD

Ref. # Part # Description Qty.

Fuses

FUSE1 A091-0007-0 5 x 20mm, 0.5A, 125V, FAST, UL, CSA 1

FUSE2 A091-0011-0 5 x 20mm, 10A, 125V, FAST, UL, CSA 1

Integrated Circuits

U1 A001-0005-0 LM393N, DUAL COMPARATOR, 8 PIN DI 1

U2 A001-2009-0 LM556CN DUAL TIMER 1

Transistors

Q1, 5, 6 A010-1013-0 MPSA56 PNP 80V 500MA TO-92 3

Q2, 3, 4, 7, 8 A010-0012-0 MPSA06 NPN 80V 500MA TO-92 5

Q29, 34 A010-0003-0 2SC3502-F, NPN, 200V, 100MA, TO-126 2

Q31, 36 A010-1003-0 2SA1380-F, PNP, 200V, 100MA, TO-126 2

Diodes

D1, 2, 3, 4, 7 A020-2106-0 1N4004, RECT, 1A, 150V, DO-41 5

D5, 6, 8, 9, 10, A020-1000-0 1N4148, RECT-FAST, 200MA, 100V, 4NS, 12

11, 12, 13, 14,
15, 16, 27

D17, 18, 19, 20, A025-0030-0 LED, BLUE, T1, .190, 470NM, SMALL 9

21, 22, 23, 24,
25

D26 A025-0012-0 LED, RED/GRN, 5MM, 630NM/560NM, 1

D28 A020-0004-0 1N755A, ZENER, 7.5V, 500MW, DO-35 1

Capacitor

C1 A034-7103-0 CAP, CERAMIC DISK, .01m F, 10%, X-250V 1
C2, 3, 5, 9, 11 A030-2104-0 CAP, CERAMIC, AX, .1m F, 10%, 50V, X7R 5
C4 A031-0108-0 CAP, ELEC, RAD, 1000m F, -10%+50%, 16V 1
C6, 7, 8, 12 A031-0107-0 CAP, ELEC, RAD, 100m F, +/-20%, 4

C10 A031-0106-1 CAP, ELEC, RAD, 10m F, 20%, 25V, NP 1
C13, 14 A030-2103-0 CAP, CERAMIC, AX, .01m F, 10%, 50V, X7R 2

Resistors

R1, 2, 5, 9, A050-1003-0 RES, CARBON FILM, 10K OHM, 1/8W, 5% 9

10, 15, 18,
20, 22

R3, 4, 6, 19 A050-1004-0 RES, CARBON FILM, 100K OHM, 1/8W, 5% 4

R8, 13 A050-4703-0 RES, CARBON FILM, 47K OHM, 1/8W, 5% 2

R11, 12 A050-4702-0 RES, CARBON FILM, 4.7K OHM, 1/8W, 5% 2

R14 A050-0750-0 RES, CARBON FILM, 7.5 OHM, 1/8W, 5% 1

R17 A051-1502-0 RES, CARBON FILM, 1.5K OHM, 1/4W, 5% 1

R16 A051-2202-0 RES, CARBON FILM, 2.2K OHM, 1/4W, 5% 1

R21 A050-1005-0 RES, CARBON FILM, 1M OHM, 1/8W, 5% 1

15MCD

16V, LOW L

Miscellaneous

A022-3001-0 THERMISTOR, 120 OHM, 2AMP, CL-90 1

A080-0002-A TRANS. STANDBY, 120V 10V@.35A 1
A080-0003-A TRANS. STANDBY, 230V 10V@.35A 1

K1, 2 A084-0001-0 RELAY SPNO 12VDC, 20A/125VAC, TV-10 2

S3 A090-0007-0 SWITCH, 8A/128A, 250V, PP, PCB 1

P1, 3, 4 A092-0010-0 FASTON, M, PC, .25" 3

P2 A092-0024-0 FASTON, M, PC, .187" 1

S4 A093-0049-0 HDR, 2MMX5, HORIZ, MALE, LOCK 1

T1 A080-0025-A TRANSFORMER SIG 1.5, 120VA 1

P5, 6 A093-0051-0 HDR, 2MMX2, VERT, MALE, LOCK 2

S2 A093-0151-0 HDR, 2MMX5, VERT, MALE, LOCKING 1

S1 A093-2005-0 HDR, 2MMX7, VERT, SHROUDED 1

A095-0009-0 TRANSFORMER SIG 1.5, 230V 1

A094-0004-0 FUSE CLIP, 5MM, P.C. MOUNT 2

HA206-0003-C Loaded Sig. 1.5 Power Switch Board 1

POWER AMP BOARD (120V)

Ref. # Part # Description Qty.

Transistors

Q1, 2, 39, 41, A010-0001-0 2SC3478, NPN, 180V, 100MA 6

44, 47

Q3, 42, 43 A010-1013-0 MPSA56 PNP 80V 500MA TO-92 3

Q4, 5, 8, 9, 12, A012-1003-0 2SA1962, PNP, 230V, 15A, 2-16C1A 12

13, 16, 17,
20, 21, 24,
25

Q6, 7, 10, 11, A012-0003-0 2SC5242, NPN, 230V, 15A, 2-16C1A 12

14, 15, 18,
19, 22, 23,
26, 27

Q28, 33 A012-1002-0 2SA1837 PNP 200V 1.5A 2-10R1A 2

Q30, 32, 35, 37 A012-0002-0 2SC4793 NPN 200V 1.5A 2-10R1A 4

Q38, 40, 45, A010-1002-0 2SA1376, PNP, 180V, 100MA, TO-92 6

46, 48, 49

Q50, 51, 52, 53 A010-0010-0 2SC2240, NPN, 120V, 100MA, TO-92 4

Q54, 55, 56, 57 A010-0012-0 MPSA06 NPN 80V 500MA TO-92 4

Diodes

BR1, 2 A023-0112-0 BRIDGE, 25A, 200V, VERT, PC, MP25S-02 2

D1, 2, 7, 10, A020-1000-0 1N4148, RECT-FAST, 200MA, 100V, 4NS 6

15, 16

D3, 4, 5, 6 A020-2106-0 1N4004, RECT, 1A, 150V, DO-41 4

D8, 9, 11, 12 A020-1022-0 BAV20, DIODE RECT, 200V 4

12

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Capacitors

C1, 2, 3, 4, 5, A031-4828-0 CAP, ELEC, RAD, 8200m F, 20%, 80V 8

6, 7, 8

C9, 10, 13, 14 A032-7104-0 CAP, PE, .1m F, 20%, 250V 4
C11, 12, 16, 17 A031-2106-0 CAP, ELEC, RAD, 10m F, -10%+50%, 50V 4
C15 A030-2104-0 CAP, CER, AX, .1m F, 10%, 50V, X7R 1

C18, 19 A035-8181-0 CAP, MICA, 180 PF, 5%, 500V 2
C20, 23, 36, 37 A031-4476-0 CAP, ELEC, RAD, 47m F, 20%, 100V 4
C21, 24, 27, 32 A030-4104-0 CAP, CER AXIAL, .1m F, 10%, 100V, X7R 4

C22, 25 A035-8100-0 CAP, MICA, 10PF, 5%, 500V 2
C28, 33, 38, 40 A031-0477-0 CAP, ELEC, RAD, 470m F, 20%, 10V 4
C29, 30, 34, 35 A030-2102-0 CAP, CER, AX, .001m F, 10%, 50V, X7R 4
C39, 41 A032-4104-0 CAP, PE, .1m F, 10%, 100V 2

C42, 43, 44, 45, A030-2271-0 CAP, CER AXIAL, 2700pf, 10%, 50V, NPO 6

46, 47

Resistors

R1, 108, 109, A055-0101-0 RES, METAL OXIDE, 10 OHM, 2W, 5% 5

111, 112

R2, 3, 4, 5 A055-6802-0 RES, METAL OXIDE, 6.8K, 2W, 5% 4

R6, 10, 40, 41, A050-1001-0 RES, CARBON FILM, 100 OHM, 1/8W, 5% 13

42, 43, 44,
45, 86, 89,
94, 97, 104

R7, 9, 11, 13, A050-4703-0 RES, CARBON FILM, 47K OHM, 1/8W, 5% 7

41, 100, 102

R8, 12, 105, 106 A050-1003-0 RES, CARBON FILM, 10K OHM, 1/8W, 5% 4

R15 A050-3302-0 RES, CARBON FILM, 3.3K OHM, 1/8W, 5% 1

R16, 17, 18, 19, A054-.330-0 RES, WIRE WOUND, .33 OHM, 1W, %5 21

20, 21, 22,
23, 24, 25,
26, 27, 28,
29, 30, 31,
32, 33, 34,
35, 36

R46, 53, 62, 71 A050-7500-0 RES, CARBON FILM, 75 OHM, 1/8W, 5% 4

R47, 51, 54, 58 A050-1503-0 RES, CARBON FILM, 15K OHM, 1/8W, 5% 4

R48, 55 A050-0331-0 RES, CARBON FILM, 33 OHM, 1/8W, 5% 2

R49, 56 A050-5602-0 RES, CARBON FILM, 5.6K OHM, 1/8W, 5% 2

R50, 57, 63, 64, A050-1002-0 RES, CARBON FILM, 1K OHM, 1/8W, 5% 18

65, 66, 67,
68, 72, 73,
74, 75, 76,
77, 92, 93,
116, 120

R52, 59 A050-1502-0 RES, CARBON FILM, 1.5K OHM, 1/8W, 5% 2

R60, 69 A070-0520-0 POT, 500 OHM TRIM, .375 ROUND, SLOT, 2

R61, 70 A050-1202-0 RES, CARBON FILM, 1.2K OHM, 1/8, 5% 2

R78, 81, 84, 85 A050-0101-0 RES, CARBON FILM, 10 OHM, 1/8W, 5% 4

R79, 80 A052-1583-0 RES, METAL FILM, 15.8K OHM, 1/4W, 1% 2

R82, 83, 114, A060-3323-0 RES, METAL FILM, 33.2K OHM, 1/8W, 1% 4

118

R87, 90, 95, 98 A050-1302-0 RES, CARBON FILM, 1.3K OHM, 1/8W, 5% 4

R88, 91, 96, 99 A050-1201-0 RES, CARBON FILM, 120 OHM, 1/8W 5% 4

R101, 103 A050-1801-0 RES, CARBON FILM, 180 OHM, 1/8W, 5% 2

R107, 110 A056-0100-0 RES, WIRE WOUND, 1.0 OHM, 5W, 10% 2

R113, 177 A060-7501-0 RES, METAL FILM, 750 OHM, 1/8W, 1% 2

R115, 119 A050-1004-0 RES, CARBON FILM, 100K OHM, 1/8W, 5% 2

Miscellaneous

F1, 2, 3, 4 A091-0013-0 FUSE, 5MM, 6.3A, 250V, SLB, SEMKO 4

F1, 2, 3, 4 A094-0004-0 FUSE CLIP, 5MM, P.C. MOUNT 8

J1, 2 A092-0012-0 BINDING POST, X2, H, PC, GOLD, GALLIEN 2

J3 A092-0022-0 JACK, PHONE, 3.5MM, H, PC 1

J4, 5 A092-0032-0 JACK, RCAX1, H, GOLD, WT, SWITCH T/S 2

K1 A090-0006-0 SWITCH, 2P2T, SLIDE, 30V, .3A, PCHOR, G 1

L1, 2, 3, 4 A081-0055-0 INDUCTOR, 2UH, 20A, AIR CORE 4

RL1, 2 A081-0057-0 INDUCTOR, 2UH, 7A, 2743002112 FERRIT 2

A091-1003-0 THRM BRKR 100C +/-5, 0-DIFF, PC 1

A093-0001-0 HDR, .1X2, VERT, MALE 2

P4, 5 A093-0025-0 HDR, .1X2, VERT, MALE, LOCK, GOLD 2

P1, 2 A093-0080-0 HDR, .156X3, VERT, MALE, LOCK, SQR PIN 2

P3 A093-2005-0 HDR, 2MMX7, VERT, SHROUDED 1

100-0105-0 SPACER NYLON, .187" #4 4

105-0007-0 INSULATOR TUBE 1

HA206-0004-B Loaded Sig. 1.5 Amplifier Board 1

13

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 (120V) TRANSFORMER WIRING Rev A

Signature 1.5 (120V)
Transformer Wiring
Rev A

14

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 (120V) TRANSFORMER WIRING Rev B

Signature 1.5 (120V)
Transformer Wiring
Rev B

15

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 (230V) TRANSFORMER WIRING Rev A

Signature 1.5 (230V)
Transformer Wiring
Rev A

16

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 (230V) TRANSFORMER WIRING Rev B

Signature 1.5 (230V)
Transformer Wiring
Rev B

17

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

INTEGRATED CIRCUITS

U1 - LM393N DUAL COMPARATOR

A001-0005-0

OUTPUT A

INVERTING
INPUT A

NON­INVERTING
INPUT A

GND

1

2

3

4

U2 - LM556CN DUAL TIMER

A001-2009-0

CC

V

14 10

DISCHARGE

13 9

THRESHOLD

12 8

CONTROL

VOLTAGE

11

8

7

6

5

RESET

+V

S

OUTPUT B

INVERTING
INPUT B

NON­INVERTING
INPUT B

OUTPUT

TRIGGER

COMP

COMP

15

26

37

FLIP FLOP

4

FLIP FLOP

COMP

COMP

GND

DISCHARGE

THRESHOLD

CONTROL

VOLTAGE

RESET

OUTPUT

TRIGGER

18

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER SWITCH/INDICATOR SCHEMATIC (1 of 1)

G

F

E

1

2

3

4

5

G

F

1of1

Signature 1.5

E

Power Switch/Indicator Schematic

D

C

B

A

D

C

B

A

1

2

3

4

5

19

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER AMP SCHEMATIC (1 of 2)

J

Q26

111

Q24

2SC5242

2

3

R55

R1W

.33

R34

R1W

.33

Q19

Q17

2SA1962

1

2SC5242

2

3

R31

R1W

R30

R1W

.33

3

2

Q18

.33

Q16

2SA1962

2SC5242

2

3

R27

R1W

.33

R26

R1W

.33

2SA1962Q92SA1962

Q11

Q8

2SC5242

2

3

R23

R1W

R18

R1W

.33

.33

Q10

111

RL2

2UH

R11

47K

R112

10

2W

C41
104E
100V

O

+77VDC.CH2

2

W

CHGND

C46
271

C45
271

GND2

DCSENSE

-77VDC.CH2

LMK

C24
104

100V

GND2

FAULT

2

3

R12

R19

R1W

.33

R22

R1W

.33

10K

R10

100

C11
106

CH2_OUTPUT

C32
104

100V

D2

D1N4148

R13
47K

GND2

Q2

2SC

3478

D6

1N4004

RES/IND.2UH

1

R107

RES-5W

1W

R111
10

W

2W

D5

1N4004

P

CHANNEL 2

OUTPUT

J2

RED

BLK

BINDPOST

C23

476

100V

+77VOC.CH2

C7
80V
828

C6

80V

828

-77VDC.CH2

C

R98

C35

102

R97
100

C8

828

80V

C5
80V
828

R95

1.3K

R96

120

MUTE

R102

47K

D16

D1N4148

Q57
A06

R103

180

C37

476

100V

R94

100

GND2

2SC2240

R3

6.8K
2W

R5

6.8K
2W

1.3K

2SC2240

R99

120

Q55
A06

Q53

BA

NOTES

1.

1

ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED

2.

SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R69

CHANNEL 1

AGND2

INPUT

J5

RCA/1S

GND2

P1-2

P1-1

P1-3

s

T2

1

R119
100K

C38

R120

10V

3

TS

477

C47

271

F4
8A

BR2

F2
8A

1K

R118

33,2K

GND2

C14

104E

200V

3

1

24

C10

104E
200V

C34
102

2SA1376

Q52

R53

33.2K

C25

10P

500V

C33
10V
477

R117

750

GND2

D1N4148

D10

R74

1.0K

ED

Q48

R75

1.0K

BAV20

R72

1.0K

BAV20

R73

1.0K

D12

D11

Q47
2SC

3478

R77

1.0K

F

Q49

2SA1376

R59

1.5K

R54
15K

GND2

R76

1.0K

R71

75

C19

181M

500V

GND2

R56

5.6K

C17

100

R57

1K

R69

500

G

Q36
2SA

1380

1

3

2SC3502

R53

75

2

Q34

558

33

R85

R81

10

R58
15K

GND2

Q35
2SC
4793

Q40

2SA1376

3

10

Q43

A56

H

I

Signature 1.5 POWER AMPLIFIER

SCHEMATIC 1 of 2

Q41
2SC

3478

Q37

2

2SC

1

1

2

R70

1.2K

R44
100

1

4793

3

2UH

R43

100

L3

2UH

3

Q33
2SA

1827

2

L4

R45

100

Q27

2SC5242

Q25

2SA1962

1

3

P2-1

P2-2

3

2

2

R39

R1W

R38

R1W

2SC5242

.33

.33

2SA1962

P3-7

+12 VDC

R106

10K

R104

100

PHONE JACK

3.5MM

S1

J3

TS

2

T

3

ABCDE

P3-6

STAND BY

R105

10K

THERSW

TH124

P3-1

P3-2

THERM SWITCH

GND

DCSENSE

MUTE

F

P3-5

+77V.CH2

P3-3

FAULT

G

R15

3.3K

H

C15

104

Q3

A56

R14

47K

J

P3-4

FAULT

SENSE

K

LMI

O

P

20

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER AMP SCHEMATIC (2 of 2)

1

CHANNEL 1
INPUT

J4

RCA/1S

S

P5-2

P5-1

P5-3

BA

NOTES

1.

ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED

2.

SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60

6

3

15.8K

BR1

C40

10V

477

R115
100K

C44
271

SWT-2P2T-HSLIDE

1

1/4W

C13

104E

200V

1

24

C9

104E
200V

15.8K

3

T2

3

1

TS

GND1

4

S1

1

GND2

CH2_OUTPUT

F3
8A

F1

8A

5

2

2

R80

1

100V

GND1

R79

1/4W

C20

476

R115

1K

R114

33,2K

GND1

2

+77VOC.CH1

C3
80V
828

C2
80V
828

-77VDC.CH1

C

6.8K

1.3K

R2

6.8K
2W

R4

2W

R90

Q51

2SC2240

R91

120

Q54
A06

C30
102

R89
100

C4
80V
828

C1
80V
828

R87

1.3K

R88

120

MUTE

R100

47K

D15

D1N4148

Q56

A06

R101

180

C36
476

100V

R1

10

W

2W

CHGND

R86
100

2SC2240

GND1

2SA1376

Q50

R52

33.2K

C22

10P

500V

C28
10V

477

R113

750

GND1

D1N4148

C29

102

D7

R65

1.0K

Q45

ED

F

G

H

I

J

LMK

O

P

Signature 1.5 POWER AMPLIFIER

SCHEMATIC 2 of 2

R78

R109

10

2W

C39
104E
100V

+77VDC.CH1

2

W

CHGND

CHANNEL 1

OUTPUT

C43
271

C42
271

GND1

DCSENSE

-77VDC.CH1

J1

RED

BLK

BINDPOST

R66

1.0K

R63

1.0K

R64

1.0K

R68

1.0K

BAV20

D9

BAV20

D8

Q44
2SC

3478

Q46

2SA1376

R52

1.5K

R47
15K

GND1

R67

1.0K

R62

C18
181M
500V

GND1

R49

5.6K

C16

106
50V

R50

R60

500

75

1K

Q31
2SA

1380

R48

2SC4793

Q29

2SC3502

R46

75

10

R51

15K

GND1

33

Q30

Q38

2SA1376

3

R84

10

Q42

A56

R61

1.2K

1

2

Q39
2SC

3478

R41
100

1

C21
104

100V

GND1

FAULT

2

Q32
2SC

1

4793

3

R40

100

L1

2UH

3

Q28
2SA

1837

2

L2

2UH

R42

100

Q23

2SC5242

1

Q21

2SA1962

1

3

P4-1

P4-2

2

2

2SC5242

R37

R1W

.33

R36

R1W

.33

2SA1962

3

Q22

1

Q20

3

2

2SC5242

R33

R1W

.33

R32

R1W

.33

2SA1962

1

Q15

1

Q13

Q14

2

2SC5242

111

3

333

R29

R1W

.33

R28

R1W

.33

Q12

2SA1962

3

2

Q7

222

2SC5242

R25

R1W

.33

R24

R1W

.33

Q4

2SA1962Q52SA1962

2SC5242

R21

R1W

.33

R16

R1W

.33

Q6

R17

R1W

.33

R20

R1W

.33

R5

10K

R6

100

C12
106

C27
104

100V

D1

D1N4148

R9

47K

GND1

Q1
2SC
3478

D4

1N4004

RL1

RES/IND.2UH

2UH

1

R107

RES-5W

1W

R108

10

W

2W

D2

1N4004

R7

47K

ABCDE

F

G

H

J

K

LMI

O

P

21