Crown MA-2402, Macro-Tech 2402 Service manual
Operation Manual
Macro-Tech 2402
Obtaining Other Language Versions:
local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible
situation which may arise during installation, operation or maintenance.
The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have
occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice:
Grounded Bridge are trademarks of Crown International. Other trademarks are the property of their respective owners.
©2005 by Crown Audio®, Inc. 1718 W. Mishawaka Rd., Elkhart, Indiana 46517-9439 U.S.A. Telephone: 574-294-8000
Crown, Crown Audio, Amcron, Macro-Tech and ODEP are registered trademarks of Crown International. PIP and
To obtain information in another language about the use of this product, please contact your
Some models may be exported under the name Amcron.
®
127240-7
8/05
Important Safety Instructions
MA 2402 Power Amplifier
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install
in accordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as
radiators, heat registers, stoves, or other
apparatus (including amplifiers) that produce
heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider than the other.
A grounding-type plug has two blades and a
third grounding prong. The wide blade or the
third prong is provided for your safety. If the
provided plug does not fit into your outlet,
consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on
or pinched, particularly at plugs, convenience
receptacles, and the point where they exit from
the apparatus.
11) Only use attachments/accessories specified
by the manufacturer.
12) Use only with a cart, stand, tripod, bracket, or
table specified by the manufacturer, or sold
with the apparatus. When a cart is used, use
caution when moving the cart/apparatus combination to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms
or when unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as powersupply cord or plug is damaged, liquid has
been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally,
or has been dropped.
15) WARNING: TO REDUCE THE RISK OF FIRE
OR ELECTRIC SHOCK, DO NOT EXPOSE
THIS APPARATUS TO RAIN OR MOISTURE.
16) DO NOT EXPOSE TO DRIPPING OR SPLASHING. DO NOT PLACE OBJECTS FILLED WITH
LIQUID, SUCH AS VASES,ON THIS APPARATUS.
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE
TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ
PAS LES COUVERCLES. IL N’Y A PAS DES PARTIES SERVICEABLE À L’INTÉRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL
QUALIFIÉ SEULMENT.
TO COMPLETELY DISCONNECT THIS EQUIPMENT
FROM THE AC MAINS, DISCONNECT THE POWER
SUPPLY CORD PLUG FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER SUPPLY
CORD SHALL REMAIN READILY OPERABLE.
WATCH FOR THESE SYMBOLS:
The lightning bolt triangle is used to alert the user
to the risk of electric shock.
The exclamation point triangle is used to alert the
user to important operating or maintenance instructions.
IMPORTANT
The MA-2402 amplifier requires Class 1 output
wiring.
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly
above or below the unit. Because this amplifier has
a high power density, it has a strong magnetic field
which can induce hum into unshielded devices that
are located nearby. The field is strongest just above
and below the unit. Do not mount or use this product within 50 cm of sensitive equipment.
If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the
preamplifier or other sensitive equipment at the top.
FCC COMPLIANCE NOTICE
This device complies with part 15 of the FCC rules. Operation is subject to the following
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
CAUTION: Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
page 2
Operation Manual
MA 2402 Power Amplifier
Crown International, Inc.
Issued By: Crown International, Inc.
1718 W. Mishawaka Road
Elkhart, Indiana 46517 U.S.A.
Competent Body’s Name and Address:
Technology International (Europe) Limited
41-42 Shrivenham Hundred Business Park,
Shrivenham, Swindon, Wilts, SN6 8TZ
Equipment Type: Commercial Audio Power Amplifiers
Family Name: Macro-Tech
Model Names: Macro-Tech 2402
EMC Standards:
EN 55103-1:1995 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions
EN 55103-1:1995 Magnetic Field Emissions-Annex A @ 10 cm and 1 M
EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current ≤16A per phase)
EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current ≤16A
EN 55022:1992 + A1: 1995 & A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class B
EN 55103-2:1996 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity
EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)
EN 61000-4-3:1996 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)
EN 61000-4-4:1995 Electrical Fast Transient/Burst Immunity (Criteria B)
EN 61000-4-5:1995 Surge Immunity (Criteria B)
EN 61000-4-6:1996 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)
EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variation
Safety Standard:
EN 60065: 1998 Safety Requirements - Audio Video and Similar Electronic Apparatus
I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.
Signed
Larry Coburn
Title: Senior Vice President of Manufacturing
DECLARATION of CONFORMITY
Technical Construction File Route
FOR COMPLIANCE QUESTIONS ONLY:
TCF Technical Certificate No: P4300CRI1.IWS
Sue Whitfield
574-294-8289
swhitfield@crownintl.com
European Representative's Name and Address:
Nick Owen
35, Bassets Field
Thornhill
Cardiff. South Glamorgen
CF14 9UG United Kingdom
Date of Issue: March 28, 2000
Operation Manual
Due to line current harmonics, we recommend that you contact your supply authority before connection.
page 3
Table of Contents
MA 2402 Power Amplifier
Important Safety Instructions .......................... 2
Declaration of Conformity................................3
1 Welcome ................................................... 5
1.1 Features .............................................. 5
2 How to Use This Manual ....................... 5
3 Setup ......................................................... 6
3.1 Unpack Your Amplifier ........................ 6
3.2 Install Your Amplifier .......................... 6
3.3 Ensure Proper Cooling ........................6
3.4 Choose Input Wire and Connectors ....7
3.5 Choose Output Wire and Connectors... 7
3.6 Wire Your System ...............................8
3.6.1 Stereo Mode ................................ 8
3.6.2 Bridge-Mono Mode .....................8
3.6.3 Parallel-Mono Mode .................... 9
3.7 Set Input Sensitivity ............................ 10
3.8 Connect to AC Mains .......................... 10
3.9 Startup Procedure ............................... 10
4 Operation .................................................. 10
4.1 Precautions .........................................10
4.2 Front Panel Controls and Indicators .... 11
4.3 Back Panel Controls, Indicators and
Connectors .........................................12
4.4 Indicators ............................................13
5 Advanced Features and Options ..........14
5.1 Protection Systems.............................. 14
5.1.1 ODEP............................................ 14
5.1.2 Standby Mode..........................................14
5.1.3 Transformer Thermal Protection...............14
5.1.4 Fuses and Circuit Breakers.......................15
5.2 Advanced Features ...........................................15
5.3 Options.............................................................16
5.3.1 PIP and PIP2 Modules............................16
5.3.2 Cooling Fan Options ...............................17
5.3.3 Level Control Shaft Lock.........................17
6 Troubleshooting ....................................................18
7 Theory of Operation.............................................19
7.1 Overview...........................................................19
7.2 Circuit Theory...................................................19
7.2.1 Stereo Operation.......................................19
7.2.2 Bridge-Mono Operation............................20
7.2.3 Parallel-Mono Operation..........................20
8 Specifications........................................................21
9 AC Power Draw and Thermal Dissipation.......25
10 Service .................................................................27
10.1 International and Canada Service...................27
10.2 US Service......................................................27
10.2.1 Service at a US Service Center...............27
10.2.2 Factory Service.......................................27
10.2.3 Factory Service Shipping Instructions....27
10.2.4 Packing Instructions...............................27
10.2.5 Estimate Approval...................................27
10.2.6 Payment of Non-Warranty Repairs..........27
11 Warranty...............................................................28
Factory Service Information Form .........................31
page 4
Operation Manual
MA 2402 Power Amplifier
20 Hz–20 kHz
*
**
1 kHz
Power
MA-2402
2 ohm Dual (per ch.)
4 ohm Dual (per ch.)
8 ohm Dual (per ch.)
4 ohm Bridge-Mono
8 ohm Bridge-Mono
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.1% THD.
**20 Hz–20 kHz Power: refers to maximum average power
in watts from 20 Hz to 20 kHz with 0.1% THD.
Power
1,050W
800W
520W
2,070W
1,585W
850W
750W
505W
1,670W
1,485W
1 Welcome
Congratulations on purchasing the renowned
®
Crown
Macro-Tech® 2402 power amplifier. It
is designed to provide enormous levels of pure,
undistorted power in a rugged, low-profile
package — making it the choice for pro sound
reinforcement. It utilizes our patented ODEP
protection circuitry to keep the show going
long after other amplifiers have shut down. And
with its PIP
™
expandability, the amplifier can be
easily customized with one of our many
optional input modules (see Section 5 for a list
of available PIPs).
Modern power amplifiers are sophisticated
pieces of engineering capable of producing
extremely high power levels. They must be
treated with respect and correctly installed if
they are to provide the many years of reliable
service for which they were designed.
In addition, the Macro-Tech 2402 amplifier
includes a number of features which require
some explanation before it can be used to its
maximum advantage.
Please take the time to study this manual so
that you can obtain the best possible service
from your amplifier.
1.1 Features
•Crown’s Grounded-Bridge™ design deliv-
ers large voltage swings without using
easily stressed output-transistor configurations like conventional amplifiers. The
results are lower distortion and superior
reliability.
• Patented ODEP (Output Device Emulation
Protection) circuitry compensates for
®
overheating and overload to keep the
amplifier working when others would fail.
• Complete protection against shorted,
open, and mismatched loads, overheating,
DC, high-frequency overload, and full
internal fault protection provided by our
latest protection scheme: “Quad-Mute.”
• Two mono modes (Bridge-Mono and
Parallel-Mono) for driving a wide range of
load impedances.
• Dedicated power supply transformers isolate channels in Stereo mode for superb
crosstalk characteristics and reliability —
each channel is virtually a separate
amplifier.
• High damping factor provides superior
control over low-frequency drivers for a
clean, accurate low end.
• PIP (Programmable Input Processor) connector accepts accessories that tailor the
amplifier to suit specific applications.
• Enhanced PIP2™ (Programmable Input
Processor) connector accepts new accessory modules that further tailor the amplifier to suit specific applications, including
wideband load current monitoring.
• Backed by the industry’s ONLY three-year,
no-fault, fully transferable warranty.
2 How to Use This
Manual
This manual provides you with the necessary
information to safely and correctly set up and
operate your amplifier. It does not cover every
aspect of installation, setup or operation that
might occur under every condition. For additional information, please consult Crown’s
Amplifier Application Guide (available online at
www.crownaudio.com), Crown Technical Support, your system installer or retailer.
We strongly recommend you read all instructions, warnings and cautions contained in this
manual. Also, for your protection, please send
in your warranty registration card today. And
save your bill of sale—it’s your official proof of
purchase.
Operation Manual
page 5
3 Setup
MA 2402 Power Amplifier
3.1 Unpack Your Amplifier
Please unpack and inspect your amplifier for any
damage that may have occurred during transit. If
damage is found, notify the transportation company
immediately. Only you can initiate a claim for shipping damage. Crown will be happy to help as
needed. Save the shipping carton as evidence of
damage for the shipper’s inspection.
We also recommend that you save all packing materials so you will have them if you ever need to transport the unit. Never ship the unit without the factory
pack.
YOU WILL NEED (not supplied):
• Input wiring cables
• Output wiring cables
Rack for mounting amplifier (or a stable surface for
stacking)
WARNING: Before you start to set up your
amplifier, make sure you read and observe
the Important Safety Instructions at the
beginning of this manual.
3.2 Install Your Amplifier
CAUTION: Before you begin, make sure your
amplifier is disconnected from the power
source, with power switch in the “off” position and all level controls turned completely
down (counterclockwise).
Use a standard 19-inch (48.3-cm) equipment rack.
See Figure 3.1 for amplifier dimensions.
You may also stack amps without using a cabinet.
NOTE: When transporting, amplifiers should be
supported at both front and back.
LEVEL LEVEL
181512
9
21
24
6
27
3
30
0
ODEP
SIGNAL/IOC
3.3 Ensure Proper Cooling
When using an equipment rack, mount units
directly on top of each other. Close any open spaces
in rack with blank panels. DO NOT block front or
rear air vents. The side walls of the rack should be a
minimum of 2 inches (5.1 cm) away from the amplifier sides, and the back of the rack should be a minimum of 4 inches (10.2 cm) from the amplifier back
panel.
Figure 3.2 illustrates standard amplifier airflow.
181512
9
21
24
6
27
3
30
0
ENABLECH1 CH2
ON
OFF
3.5 in
8.9 cm
page 6
19 in
48.3 cm
SIDE VIEW
16 in
40.6 cm
Figure 3.1 Dimensions
Figure 3.2 Airflow
2.5 in
6.35 cm
Operation Manual
MA 2402 Power Amplifier
3 Setup
3.4 Choose Input Wire
and Connectors
Crown recommends using pre-built or professionally wired, balanced line (two-conductor
plus shield), 22-24 gauge cables and connectors.The factory-installed PIP2-FXQ input module accepts 3-pin male XLR connectors or TRS
phone connectors. Other PIP modules accept
XLR, phone or Phoenix connectors, or bare
wires.
Regarding the PIP2-FXQ, Figure 3.3 shows connector pin assignments for balanced wiring, and
Figure 3.4 shows connector pin assignments for
unbalanced wiring.
NOTE: Custom wiring should only be performed by qualified personnel.
3.5 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, high-quality, two-conductor,
heavy gauge speaker wire. Use bare wire, a dual
banana plug or spade lugs on the amplifier end
of each speaker cable (Figure 3.5). To prevent
the possibility of short-circuits, wrap or otherwise insulate exposed loudspeaker cable connectors.
Using the guidelines below, select the appropriate size of wire based on the distance from
amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 gauge
26-40 ft. 14 gauge
41-60 ft. 12 gauge
61-100 ft. 10 gauge
101-150 ft. 8 gauge
151-250 ft. 6 gauge
Figure 3.3 Balanced Input
Connector Wiring
Figure 3.4 Unbalanced Input
Connector Wiring
Operation Manual
Figure 3.5 Output Connector Wiring
CAUTION: Never use shielded cable for
output wiring.
page 7
3 Setup
3.6 Wire Your System
Turn down the Level controls (fully counterclockwise) and turn off the amplifier before wiring it as
described below.
3.6.1 Stereo Mode
See Figure 3.6. Set the back panel stereo/mono
switch to Stereo.
INPUTS: Connect input wiring to both channels.
OUTPUTS: Maintain proper polarity (+/-) on output
connectors.
Connect Channel 1 positive (+) speaker load to
Channel 1 positive terminal of amp; repeat for negative (-). Repeat Channel 2 wiring as for Channel 1.
3.6.2 Bridge-Mono Mode
See Figure 3.7. Set the back panel stereo/mono
switch to Bridge-Mono.
INPUTS: Connect input wiring to Channel 1 only.
OUTPUTS: Connect the speaker across the positive
terminals of each channel. Do not use the nega-
tive terminals when the amp is being operated in Bridge-Mono mode.
NOTE: The Channel 2 Level control should
be set fully counter-clockwise when operating the amplifier in Bridge-Mono mode.
CAUTION: Be certain all equipment (meters,
switches, etc.) connected to the mono output is balanced. To prevent oscillations,
both sides of the line must be isolated from
the input grounds.
MA 2402 Power Amplifier
Figure 3.6 Stereo Wiring
Figure 3.7 Bridge-Mono Wiring
page 8
Operation Manual
MA 2402 Power Amplifier
3 Setup
Figure 3.8
Parallel-Mono
Wiring
3.6.3 Parallel-Mono Mode
See Figure 3.8. Set the back panel
stereo/mono switch to Parallel-Mono.
INPUTS: Connect input wiring to Channel 1
only.
OUTPUTS: Add a 14 gauge (or larger) jumper
between the red(+) Channel 1 and Channel 2
binding posts. Connect the speaker positive (+)
lead to the Channel 1 red (+) terminal. Connect
the speaker negative (-) lead to the Channel 1
black (-) terminal.
Crown provides a reference of wiring pin assignments for commonly used connector types in the
Crown Amplifier Application Guide.
NOTE: Use only the Channel 1 level
control.
CAUTION: Parallel-Mono wiring requires
installation of a jumper wire. Do not
switch to Stereo or Bridge-Mono mode
until this output jumper wire is removed.
NOTE: The Channel 2 IOC indicator will
remain lit when operating in
Parallel-Mono mode.
Operation Manual
page 9
3 Setup
MA 2402 Power Amplifier
3.7 Set Input Sensitivity
The input sensitivity switch inside the amplifier is
set to 0.775 volt RMS at the factory. (Factory setting
for international models is 1.4V). It can be changed
to 1.4 volts or a voltage gain of 26 dB. The 26 dB
gain setting is equivalent to a sensitivity of 3.1 volts
for the Macro-Tech 2402.
To change the input sensitivity:
1. Turn off and unplug the amplifier from the AC
source.
2. Remove the input module on the back panel.
3. Locate the labeled access hole for the sensitivity
switch (Figure 3.9). The sensitivity switch will not
be visible because it is mounted below the hole.
Use your little finger to reach it.
4. Set the switch to the desired position.
5. Replace the input module.
SENSITIVITY SWITCH INSIDE ACCESS HOLE
1.4 V
26 dB
0.77 V
Figure 3.9 Input Sensitivity Switch
3.8 Connect to AC Mains
Connect your amplifier's power cord to the AC
mains power source (power outlet).
WARNING: The third prong of this connector
(ground) is an important safety feature. Do
not attempt to disable this ground connection by using an adapter or other methods.
Amplifiers don't create energy. The AC mains voltage and current must be sufficient to deliver the
power you expect. You must operate your amplifier
from an AC mains power source with not more than
10% variation above or below the amplifier's specified line voltage and within the specified frequency
requirements (indicated on the amplifier's back
panel label). If you are unsure of the output voltage
of your AC mains, please consult your electrician.
3.9 Startup Procedure
Use the following procedure when first turning on
your amplifier:
1.Turn down the level of your audio source.
2.Turn down the Level controls of the amplifier.
3.Turn on the Power switch. The Enable indicator
next to the Power switch should glow. The amber
ODEP lights should also be glowing.
4.Turn up the level of your audio source to an optimum level.
5.Turn up the Level controls on the amplifier until
the desired loudness or power level is achieved.
6.Turn down the level of your audio source to its
normal range.
If you ever need to make any wiring or installation
changes, don't forget to disconnect the power
cord.
For help with determining your system's optimum
gain structure (signal levels) please refer to the
Crown Amplifier Application Guide, available online
at www.crownaudio.com.
4 Operation
4.1 Precautions
Your amplifier is protected from internal and external faults, but you should still take the following
precautions for optimum performance and safety:
1. Before use, configure your amplifier for proper
operation as described in the Setup section of
this manual. Improper wiring can result in serious operating difficulties. For advanced setup
techniques, consult Crown's Amplifier Applica-
tion Guide available online at www.crownaudio.com.
2. Use care when making connections, selecting
signal sources and controlling the output level.
The load you save may be your own!
3. Do not short the ground lead of an output cable
to the input signal ground. This may form a
ground loop and cause oscillations.
4. Never connect the output to a power supply,
battery or power main. Electrical shock may
result.
5. Tampering with the circuitry, or making unauthorized circuit changes may be hazardous and
invalidates all agency listings.
6. Do Not operate the amplifier with the IOC LED
constantly flashing bright green.
7. Do Not overdrive the mixer, which will cause
clipped signal to be sent to the amplifier. Such
signals will be reproduced with extreme accuracy, and loudspeaker damage may result.
8. Do Not operate the amplifier with less than the
rated load impedance. Due to the amplifier's
output protection, such a configuration may
result in premature clipping and speaker damage.
Crown is not liable for damage that results from
overdriving other system components.
page 10
Operation Manual
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