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ORDER NO.
CRT5974
GM-A6704/XEUC

BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER

GM-A6704 /XEUC

GM-A6704 /XEEW5

GM-A6704 /XEVES

GM-A6704 /XEVID

PIONEER CORPORATION 28-8, Honkomagome 2-chome, Bunkyo-ku, Tokyo 113-0021, Japan
PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.
PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 2 Jalan Kilang Barat, #07-01, Singapore 159346
PIONEER CORPORATION 2016
K-ZZZ SEPT. 2016 Printed in Japan
1 2 3 4

SAFETY INFORMATION
CAUTION
A This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer.
Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair
complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty.
If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so
and refer the repair to a qualified service technician.

WARNING
This product may contain a chemical known to the State of California to cause cancer, or birth defects or
other reproductive harm.
Health & Safety Code Section 25249.6 - Proposition 65
B
Where in a manufacturer's service documentation, for example in circuit diagrams or lists
of components, a symbol is used to indicate that a specific component shall be replaced only
by the component specified in that documentation for safety reasons, the following symbol shall
be used:

CONTENTS
C
SAFETY INFORMATION..................................................................................................................................... 2
1. SERVICE PRECAUTIONS ............................................................................................................................... 3
1.1 SAFETY PRECAUTIONS .......................................................................................................................... 3
1.2 NOTES ON DISASSEMBLY / ASSEMBLY................................................................................................. 3
1.3 NOTES ON REPLACING PARTS .............................................................................................................. 4
1.4 OTHERS .................................................................................................................................................... 5
2. SPECIFICATIONS ............................................................................................................................................ 5
2.1 SPECIFICATIONS...................................................................................................................................... 5
3. BASIC ITEMS FOR SERVICE.......................................................................................................................... 5
3.1 CHECK POINTS AFTER SERVICING....................................................................................................... 5
3.2 JIGS LIST .................................................................................................................................................. 5
4. BLOCK DIAGRAM............................................................................................................................................ 6
D 4.1 BLOCK DIAGRAM ..................................................................................................................................... 6
5. DIAGNOSIS...................................................................................................................................................... 7
5.1 TROUBLE SHOOTING .............................................................................................................................. 7
5.2 CONNECTOR FUNCTION DESCRIPTION ............................................................................................... 8
6. SERVICE MODE .............................................................................................................................................. 8
7. DISASSEMBLY................................................................................................................................................. 9
8. EACH SETTING AND ADJUSTMENT ........................................................................................................... 10
9. EXPLODED VIEWS AND PARTS LIST.......................................................................................................... 11
9.1 PACKING ................................................................................................................................................. 11
9.2 EXTERIOR............................................................................................................................................... 13
10. SCHEMATIC DIAGRAM ............................................................................................................................... 15
10.1 P.C.B TOTAL ASSY ................................................................................................................................ 15
E
11. PCB CONNECTION DIAGRAM ................................................................................................................... 16
11.1 P.C.B TOTAL ASSY ................................................................................................................................ 16
12. ELECTRICAL PARTS LIST .......................................................................................................................... 18

F

GM-A6704/XEUC
2
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5 6 7 8

1. SERVICE PRECAUTIONS
1.1 SAFETY PRECAUTIONS
A

You should conform to the regulations governing the product (safety, radio and noise, and other regulations), and
should keep the safety during servicing by following the safety instructions described in this manual.
Heat sink becomes hot areas. Be careful not to burn yourself.

HEAT SINK

B

1.2 NOTES ON DISASSEMBLY / ASSEMBLY
Before disassembling the unit, be sure to turn off the power. Unplugging and plugging the connectors during power-on
mode may damage the ICs inside the unit.

Please be sure to conduct line process to original status if you make assembling after repair.

When you tighten the screws of following figure, tightly hold a transistor or a diode to be fixed to prevent the part
from turning by the force of tightening the screw.
(If the part turned, a stress will be applied to the solder and may cause a failure such as a solder crack.) C

D

Please install Insulator between Power Transistor and Heat Sink when you install Power Transistor in Heat Sink.
If Insulator is not installed between Power Transistor and Heat Sink, Power Transistor might be damaged.
E

F

GM-A6704/XEUC
5 6 7 8
3
1 2 3 4

1.3 NOTES ON REPLACING PARTS
Be careful in handling ICs. Some ICs such as MOS type are so fragile that they can be damaged by electrostatic
induction.
A
Please be careful of not to apply static charge onto integrated circuits, etc, when you conduct repair work.
Especially, please use soldering iron with its tip grounded.
Also, please use a pair of tweezers with static charge protection capability if there is the possibility of contacting to
device terminals, and avoid the use of metal-made tweezers.

When you replace a part fixed to the heatsink (Q141, Q142, Q241, Q242, Q341, Q342, Q441, Q442, D6, D7, Q9, Q10,
Q11 and Q12), adjust the position of the part according to the following.

Put the P.C.B TOTAL ASSY on blocks.

B

C

Put a paper between the block and the P.C.B TOTAL
ASSY, and outline transistors and diodes.
Put a part to replace in the outline.

D

Align the bottom of a transistor or a diode with the
top of the PC board, and solder it.
Apply grease, GEM1057 to the back of the part.

E

Note : Even if the unit shown in the photos and illustrations in this manual may differ from your product, the procedures
described here are common.

F

GM-A6704/XEUC
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1.4 OTHERS
Notes on soldring
For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
A
Be sure to use lead-free solder and a soldering iron that can meet specifications for use with lead-free solders for
repairs accompanied by reworking of soldering.

Operation of protection circuit
If the temperature of Heat Sink becomes approximately 80