ORDER NO.

CRT5455
GM-A6604/XEUC

BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER

GM-A6604 /XEUC

GM-A6604 /XEEW5

GM-A6604 /XEES

GM-A6604 /XENC

PIONEER CORPORATION 1-1, Shin-ogura, Saiwai-ku, Kawasaki-shi, Kanagawa 212-0031, 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. 253 Alexandra Road, #04-01, Singapore 159936
PIONEER CORPORATION 2013
K-ZZZ OCT. 2013 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
SAFETY INFORMATION..................................................................................................................................... 2
1. SERVICE PRECAUTIONS ............................................................................................................................... 3
D 1.1 SERVICE PRECAUTIONS ........................................................................................................................ 3
1.2 NOTES ON SOLDERING .......................................................................................................................... 5
2. SPECIFICATIONS ............................................................................................................................................ 6
2.1 SPECIFICATIONS ..................................................................................................................................... 6
3. BASIC ITEMS FOR SERVICE.......................................................................................................................... 8
3.1 CHECK POINTS AFTER SERVICING....................................................................................................... 8
3.2 JIGS LIST .................................................................................................................................................. 8
4. BLOCK DIAGRAM............................................................................................................................................ 8
5. DIAGNOSIS...................................................................................................................................................... 9
5.1 CONNECTOR FUNCTION DESCRIPTION ............................................................................................... 9
6. SERVICE MODE .............................................................................................................................................. 9
7. DISASSEMBLY .............................................................................................................................................. 10
E
8. EACH SETTING AND ADJUSTMENT ............................................................................................................11
9. EXPLODED VIEWS AND PARTS LIST.......................................................................................................... 12
9.1 PACKING ................................................................................................................................................. 12
9.2 EXTERIOR............................................................................................................................................... 14
10. SCHEMATIC DIAGRAM............................................................................................................................... 16
10.1 PCB KIT (GUIDE PAGE)........................................................................................................................ 16
11. PCB CONNECTION DIAGRAM.................................................................................................................... 22
11.1 PCB KIT ................................................................................................................................................. 22
12. ELECTRICAL PARTS LIST .......................................................................................................................... 26

GM-A6604/XEUC
2
1 2 3 4
 5 6 7 8

1. SERVICE PRECAUTIONS
1.1 SERVICE PRECAUTIONS
A

1. 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.
2. Be careful in handling ICs. Some ICs such as MOS type are so fragile that they can be damaged by electrostatic
induction.
3. 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.)

4. 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.
5. Operation of protection circuit
If the temperature of Heat Sink becomes approximately 80°C, the output power becomes about half for temperature
protection. D
If the temperature of Heat Sink becomes approximately 100°C, AMP operation is stopped for temperature protection.

GM-A6604/XEUC
5 6 7 8
3
 1 2 3 4

A 6. 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 PCB KIT on blocks.

Put a paper between the block and the PCB KIT,

and outline transistors and diodes.
Put a part to replace in the outline.
C

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.

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.

GM-A6604/XEUC
4
1 2 3 4
 5 6 7 8

1.2 NOTES ON SOLDERING

For environmental protection, lead-free solder is used on the printed circuit boards mounted in this unit.
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.

Compared with conventional eutectic solders, lead-free solders have higher melting points, by approximately 40 C.
Therefore, for lead-free soldering, the tip temperature of a soldering iron must be set to around 373 C in general, although
the temperature depends on the heat capacity of the PC board on which reworking is required and the weight of the tip of
the soldering iron.

Compared with eutectic solders, lead-free solders have higher bond strengths but slower wetting times and higher melting
temperatures (hard to melt/easy to harden).
B

The following lead-free solders are available as service parts:

Parts numbers of lead-free solder:
GYP1006 1.0 in dia.
GYP1007 0.6 in dia.
GYP1008 0.3 in dia.

GM-A6604/XEUC
5 6 7 8
5
 1 2 3 4

2. SPECIFICATIONS
2.1 SPECIFICATIONS
A • GM-A6604/XEUC • GM-A6604/XEEW5
Power source.............................14.4 V DC (10.8 V to 15.1 V Power source.............................14.4 V DC (10.8 V to 15.1 V
allowable) allowable)
Grounding system...................Negative type Grounding system...................Negative type
Current consumption ............31 A (at continuous power, Current consumption ............31 A (at continuous power,
4 Ω) 4 Ω)
Average current drawn.........8.5 A (4 Ω for four channels)
Average current drawn.........8.5 A (4 Ω for four channels)
14 A (4 Ω for two channels)
14 A (4 Ω for two channels) Backup current ....................... 1 mA or less
Backup current ....................... 1 mA or less
Fuse.............................................. 25 A × 2
Fuse.............................................. 25 A × 2
Dimensions (W × H × D) ... 348 mm × 60 mm ×
Dimensions (W × H × D) ... 348 mm × 60 mm × 215 mm
215 mm Weight ........................................ 2.3 kg (Leads for wiring not
(13-3/4 in. × 2-3/8 in. × included)
8-1/2 in.) Maximum power output .......120 W × 4 (4 Ω) / 190 W × 4
B Weight ........................................ 2.3 kg (5.1 lbs) (2 Ω) / 760 W TOTAL
(Leads for wiring not in- (BRIDGE)
cluded) Continuous power output ... 60 W × 4 (at 14.4 V, 4 Ω,
Maximum power output .......120 W × 4 (4 Ω) / 190 W × 4 20 Hz to 20 kHz 1 % THD
(2 Ω) / 760 W TOTAL +N)
180 W × 2 (at 14.4 V, 4 Ω
(BRIDGE)
BRIDGE 1 kHz, 1 % THD
Continuous power output ... 60 W × 4 (at 14.4 V, 4 Ω,
+N)
20 Hz to 20 kHz 1 % THD 90 W × 4 (at 14.4 V, 2 Ω,
+N) 1 kHz, 1 % THD+N)
180 W × 2 (at 14.4 V, 4 Ω Load impedance ..................... 4 Ω (2 Ω to 8 Ω allowable)
BRIDGE 1 kHz, 1 % THD Frequency response...............10 Hz to 70 kHz (+0 dB,
+N) –3 dB)
90 W × 4 (at 14.4 V, 2 Ω, Signal-to-noise ratio.............. 95 dB (IEC-A network)
1 kHz, 1 % THD+N) Distortion ................................... 0.05 % (10 W, 1 kHz)
Load impedance ..................... 4 Ω (2 Ω to 8 Ω allowable) Low pass filter:
C (A ch)
Frequency response...............10 Hz to 70 kHz (+0 dB,
Cut off frequency ...........80 Hz
–3 dB)
Cut off slope .....................–12 dB/oct
Signal-to-noise ratio.............. 95 dB (IHF-A network)
(B ch)
Distortion ................................... 0.05 % (10 W, 1 kHz) Cut off frequency ...........40 Hz to 500 Hz
Low pass filter: Cut off slope .....................–12 dB/oct
(A ch) High pass filter:
Cut off frequency ...........80 Hz (A ch)
Cut off slope .....................–12 dB/oct Cut off frequency ...........80 Hz
(B ch) Cut off slope .....................–12 dB/oct
Cut off frequency ...........40 Hz to 500 Hz (B ch)
Cut off slope .....................–12 dB/oct Cut off frequency ...........40 Hz to 500 Hz
High pass filter: Cut off slope .....................–12 dB/oct
Bass boost:
(A ch)
Frequency......................... 50 Hz
Cut off frequency ...........80 Hz
Level................................... 0 dB to 12 dB
D Cut off slope .....................–12 dB/oct Gain control:
(B ch) RCA .................................... 0.3 V to 6.5 V
Cut off frequency ...........40 Hz to 500 Hz Speaker ............................ 3.0 V to 26 V
Cut off slope .....................–12 dB/oct Maximum input level / impedance:
Bass boost: RCA .................................... 6.5 V / 22 kΩ
Frequency......................... 50 Hz Speaker ............................ 26 V / 16 kΩ
Level....................................0 dB to 12 dB
Gain control:
RCA .................................... 0.3 V to 6.5 V
Speaker .............................3.0 V to 26 V

Maximum input level / impedance:

RCA .....................................6.5 V / 22 kΩ
Speaker .............................26 V / 16 kΩ
E
CEA2006 Specifications

Power output ............................60 W RMS × 4 Channels (at

14.4 V, 4 Ω and 1 % THD
+N)
S/N ratio ......................................78 dBA (reference: 1 W into
4 Ω)

GM-A6604/XEUC
6
1 2 3 4
 5 6 7 8

• GM-A6604/XEES, /XENC A
Power source.............................14.4 V DC (10.8 V to 15.1 V
allowable)
Grounding system...................Negative type
Current consumption ............31 A (at continuous power,
4 Ω)
Average current drawn.........8.5 A (4 Ω for four channels)
14 A (4 Ω for two channels)
Backup current ....................... 1 mA or less
Fuse.............................................. 25 A × 2
Dimensions (W × H × D) ... 348 mm × 60 mm ×
215 mm
Weight ........................................ 2.3 kg (Leads for wiring not
included)
Maximum power output .......120 W × 4 (4 Ω) / 190 W × 4
(2 Ω) / 760 W TOTAL B
(BRIDGE)
Continuous power output ... 60 W × 4 (at 14.4 V, 4 Ω,
20 Hz to 20 kHz 1 % THD
+N)
180 W × 2 (at 14.4 V, 4 Ω
BRIDGE 1 kHz, 1 % THD
+N)
90 W × 4 (at 14.4 V, 2 Ω,
1 kHz, 1 % THD+N)
Load impedance ..................... 4 Ω (2 Ω to 8 Ω allowable)
Frequency response...............10 Hz to 70 kHz (+0 dB,
–3 dB)
Signal-to-noise ratio.............. 95 dB (IEC-A network)
Distortion ................................... 0.05 % (10 W, 1 kHz)
Low pass filter:
(A ch) C
Cut off frequency ...........80 Hz
Cut off slope .....................–12 dB/oct
(B ch)
Cut off frequency ...........40 Hz to 500 Hz
Cut off slope .....................–12 dB/oct
High pass filter:
(A ch)
Cut off frequency ...........80 Hz
Cut off slope .....................–12 dB/oct
(B ch)
Cut off frequency ...........40 Hz to 500 Hz
Cut off slope .....................–12 dB/oct
Bass boost:
Frequency......................... 50 Hz
Level................................... 0 dB to 12 dB
Gain control: D
RCA .................................... 0.3 V to 6.5 V
Speaker ............................ 3.0 V to 26 V
Maximum input level / impedance:
RCA .................................... 6.5 V / 22 kΩ
Speaker ............................ 26 V / 16 kΩ

Notes
 Specifications and the design are subject to
modifications without notice.
 The average current drawn is nearly the maxi-
mum current drawn by this unit when an
audio signal is input. Use this value when
working out total current drawn by multiple E
power amplifiers.

GM-A6604/XEUC
5 6 7 8
7
 1 2 3 4

3. BASIC ITEMS FOR SERVICE

3.1 CHECK POINTS AFTER SERVICING
A

To keep the product quality after servicing, please confirm following check points.

No. Procedures Item to be confirmed

1 Confirm whether the customer complain has The customer complain must not be
been solved. reappeared.
Audio and operations must be normal.
2 Check the output sound. Audio and operations must be normal.
3 Appearance check No scratches or dirt on its appearance after
receiving it for service.
B

See the table below for the items to be checked regarding audio:

Item to be checked regarding audio

Distortion
Noise
Volume too low
Volume too high
Volume fluctuating
Sound interrupted
C

3.2 JIGS LIST

D - Lubricants and Glues List
Name Grease No. Remarks
Grease GEM1057 Applying to Heatsink
Bond GYL1006 Applying to choke coil, resistor and capacitor

4. BLOCK DIAGRAM
There is not information to be shown in this chapter.

GM-A6604/XEUC
8
1 2 3 4
 5 6 7 8

5. DIAGNOSIS
5.1 CONNECTOR FUNCTION DESCRIPTION
Front side A

Rear side

6. SERVICE MODE
There is not information to be shown in this chapter.

GM-A6604/XEUC
5 6 7 8
9
 1 2 3 4

7. DISASSEMBLY
While the photograph shown is slightly different from this model in shape, the disassembly procedure is the same.
A
- Removing the Panel (Fig.1)
1 1
1 Remove the eight screws and
then remove the Panel. 1 1

B 1 1

1 1

Panel

Fig.1

- Removing the PCB Kit (Fig.2)

C 1 Remove the eight screws. 1 1 2 2 2

1 1 2 2 2
2 Remove the six screws.

3 Remove the four screws.

1 1
4 Remove the eight screws and then
remove the PCB Kit.
1 1
D

3 3
4 4

4 4
4

E
4 4
3 3

PCB Kit Fig.2

GM-A6604/XEUC
10
1 2 3 4
 5 6 7 8

- How to assemble the PCB Kit A

1. 4 Eight screws.

2. 3 Four screws.

3. 2 Six screws.

4. 1 Eight screws.

Bonding Position

1 GYL1006

1 1
1 1 1

1
1
1 D

8. EACH SETTING AND ADJUSTMENT F

There is not information to be shown in this chapter.

GM-A6604/XEUC
5 6 7 8
11
 1 2 3 4

9. EXPLODED VIEWS AND PARTS LIST

NOTES : Parts marked by " * " are generally unavailable because they are not in our Master Spare Parts List.
The > mark found on some component parts indicates the importance of the safety factor of the part.
A
Therefore, when replacing, be sure to use parts of identical designation.
"
Screw adjacent to mark on the product are used for disassembly.
For the applying amount of lubricants or glue, follow the instructions in this manual.
(In the case of no amount instructions,apply as you think it appropriate.)
9.1 PACKING

GM-A6604/XEUC
12
1 2 3 4
 5 6 7 8

(1) PACKING SECTION PARTS LIST

Mark No. Description Part No. Mark No. Description Part No.

* 1 Poly Bag 6337210282000 6 Protector 6230213514000

* 2 Poly Bag 6337210499000 7 Poly Bag 6337210179100
A
3 Screw B010440183B10 8 Unit Box See Contrast table (2)
4 Cord Assy L008101080030 9 Contain Box See Contrast table (2)
* 5 Warranty Card See Contrast table (2) 10 Owner's Manual See Contrast table (2)

(2) CONTRAST TABLE

GM-A6604/XEUC, GM-A6604/XEEW5, GM-A6604/XEES and GM-A6604/XENC are constructed the same except
for the following;
Mark No. Description GM-A6604/XEUC GM-A6604/XEEW5 GM-A6604/XEES GM-A6604/XENC
* 5 Warranty Card 5727000000390 5727000000380 Not used Not used
8 Unit Box 6007212480010 6007212480000 6007212480020 6007212480030 B
9 Contain Box 6027210890010 6027210890000 6027210890020 6027210890030
10 Owner's Manual 5707000008300 5707000008290 5707000008310 5707000008310

Owner's Manual,Installation Manual

Part No. Language

5707000008300 English, French, Spanish(Espanol)

5707000008290 English, French, Italian, Spanish(Espanol), German, Dutch, Russian

5707000008310 English, Spanish(Espanol), Portuguese(B), Arabic

GM-A6604/XEUC
5 6 7 8
13
 1 2 3 4

9.2 EXTERIOR

B
C

E
F
G
I
J H
K

C L
M A
N

E
A F
I G
H

J
D K
B L
M C

O
D
P

E O
R
Q

S P

GM-A6604/XEUC
14
1 2 3 4
 5 6 7 8

EXTERIOR SECTION PARTS LIST

Mark No. Description Part No. Mark No. Description Part No.

1 Screw B020020063P10 11 Panel 3207214756010

2 Screw B020030081W10 > 12 Fuse(25 A) G655253320110
A
3 Screw B020030083B10 13 Plate 4317215911000
4 Screw B020030083B10 14 Terminal G602405B01000
5 Screw B020030103B10 15 Battery Terminal G61801JXZ3X10

6 Screw B020030123W10 16 Speaker Terminal G61801JXZ4X20

7 Screw B020026081B10 17 Fuse Holder G640000200010
8 Heat Sink 2127212238010 18 Board to Wire Connecter L102250080020
9 Panel 3200214786000 19 Terminal 3790040886000
10 Panel 3207214746000 20 Holder 4010215136000

Note 1) PCB KIT (AMP Unit) is not supplied as a service part.

Note 2) Insulators between Power Transistors and the Heat Sink are supplied with Power Transistors.

GM-A6604/XEUC
5 6 7 8
15
 1 2 3 4

10. SCHEMATIC DIAGRAM

10.1 PCB KIT (GUIDE PAGE)
A Note: When ordering service parts, be sure to refer to " EXPLODED VIEWS AND PARTS LIST" or
"ELECTRICAL PARTS LIST".

A-a A-b
Large size
SCH diagram
A-a
High Input(SP INPUT) & Gain Control:
-35.0 dB(min), -16.0(normal), -8.0(max)

Gain Control(Low Input) :

-21.0 dB(min), ±0.0(normal), +6.0(max)
A-a A-b Low Input(RCA Input)Buffer : +4.0 dB LPF [OFF] &HPF [OFF]: ±0 dB Pre AMP & Mute : -4.0 dB
Guide page
High Input Buffer / Gain Control 80Hz HPF

CH A GAIN
C450105300010
First Step
Differential Absor

+
A-a A-b Detailed page A-Lch(+)
AUTO LEVEL /MUTE

+
B
CH A LPF/HPF
+

A-Lch(-)
G060231900020
+

A-Lch LOW +

+
+

Low Input Buffer

INPUT SELECT
G060221900020

G060231900020

CH A
LPF/HPF +

C
80Hz LPF

CHC450105300010
A GAIN
+

A-Rch(+)
+
+

A-Rch(-)

+
Invertor
+

A-Rch LOW

CH B LPF/HPF
G060231900020
CH B GAIN 0~12dB BASS BOOST 40~500Hz HPF +
C450105300010
+

B-Lch(+)

D
+

B-Lch(-)
C450105400020
+

B-Lch LOW

FREQ
BASS BOOST C450101400020

40Hz~500Hz LPF
+

INPUT SELECT FREQ

G060221900020 FREQ
C450101400020 C450101400020

CH B
LPF/HPF +
+

G060231900020

CH B GAIN
C450105300010
+

B-Rch(+)
+

B-Rch(-)
+

B-Rch LOW

C450105400020

BASS BOOST C450101400020

FREQ

A
GM-A6604/XEUC
16
1 2 3 4
 5 6 7 8

A-b
A PCB KIT

Power AMP : +28.0 dB

First Step
Differential Absorption Second Step Q138 Bias DC Rectification
Differential Absorption Drive Power Amplification Over Current Detection
+

B
+
> >

+
+

POWER

GROUND

+
SYSTEM
SPEAKER OUTPUT
CONTROL

Trance(6:13)
AC Boost
A-Lch+

- BRIDGE +
A-Lch -

+
A-Rch -
+

A-Rch+
C

+
B-Lch -

+ BRIDGE -
B-Lch+
+

B-Rch+

B-Rch - PWM Buffer Drive

Power ON/OFF Control

+

Protector Over Current D

8 9
+

7 10
+
PWM Control
+

6 11

+ +

5 12

4 13
+

3 14

2 15

1 16
+

DC Protector
+

High Temp Detect

E
Protection LED
+

+
+
+

Over Voltage Control

Protection Protection

Mute Drive

Auto Level Control Drive

NOTE :
Symbol indicates a resistor. The > mark found on some component parts indicates
No differentiation is made between chip resistors and the importance of the safety factor of the part. F
discrete resistors. Therefore, when replacing, be sure to use parts of
Symbol indicates a capacitor. identical designation.
No differentiation is made between chip capacitors and

A
discrete capacitors. NM : No Mount

GM-A6604/XEUC
5 6 7 8
17
 F
E
B
A

D
C

18
A-a A-b
A-b

1
1

A PCB KIT

Power AMP : +28.0 dB

p
al Absorption Second Step Q138 Bias DC Rectification
Differential Absorption Drive Power Amplification Over Current Detection

+
> >

2
2

+
POWER
+

GROUND

SYSTEM
SPEAKER OUTPUT
CONTROL

GM-A6604/XEUC
A-Lch+
Trance(6:13)
AC Boost

A-Lch -

3
3

- BRIDGE +
+

A-Rch -

A-Rch+
+

B-Lch -

B-Lch+

+
+ BRIDGE -

B-Rch+

B-Rch -

4
4

PWM Buffer Drive

Power ON/OFF Control
 PW
Power ON/OFF Contr

Protector Over Current

8 9

+
5

5
7 10
+

+
6 11

+ +

PWM Control
5 12

4 13

3 14

2 15

1 16

6
6

DC Protector +

Protection LED

+
+
High Temp Detect

GM-A6604/XEUC
+
+

7
7

Over Voltage Control

Protection Protection

Mute Drive

Auto Level Control Drive

NOTE :
Symbol indicates a resistor. The > mark found on some component parts indicates
No differentiation is made between chip resistors and the importance of the safety factor of the part.
discrete resistors. Therefore, when replacing, be sure to use parts of
Symbol indicates a capacitor. identical designation.
8

8
No differentiation is made between chip capacitors and
discrete capacitors. NM : No Mount

A-a A-b
A-b

19
E
A

D
C

F
B
 F
E
B
A

D
C

20
A-a A-b
A-b

A-a
High Input(SP INPUT) & Gain Control:
-35.0 dB(min), -16.0(normal), -8.0(max)

1
1

Gain Control(Low Input) :

-21.0 dB(min), ±0.0(normal), +6.0(max)
Low Input(RCA Input)Buffer : +4.0 dB LPF [OFF] &HPF [OFF]: ±0 dB Pre AMP & Mute : -4.0 dB

High Input Buffer / Gain Control 80Hz HPF

CH A GAIN First Step

C450105300010 Differential Absorption Secon

+
Differe
A-Lch(+)
AUTO LEVEL /MUTE
+

+
A-Lch(-)
CH A LPF/HPF
G060231900020

2
2

+
A-Lch LOW +

+
+
+

Low Input Buffer

GM-A6604/XEUC
INPUT SELECT
G060221900020

G060231900020

3
3

CH A
LPF/HPF +

80Hz LPF

A GAIN
CHC450105300010

+
A-Rch(+)
+

+
A-Rch(-)

4
4

+
A-Rch LOW Invertor

CH B LPF/HPF
G060231900020
CH B GAIN 0~12dB BASS BOOST 40~500Hz HPF +
C450105300010

+
B-Lch(+)
 CH B LPF/HPF
G060231900020
CH B GAIN 0~12dB BASS BOOST 40~500Hz HPF +
C450105300010

+
B-Lch(+)

+
B-Lch(-)
5

5
+

+
B-Lch LOW

C450105400020
FREQ
C450101400020
BASS BOOST

+
40Hz~500Hz LPF
+

INPUT SELECT FREQ

G060221900020 FREQ
C450101400020 C450101400020

CH B

6
6

LPF/HPF +
+

G060231900020
+

CH B GAIN
C450105300010

+
B-Rch(+)

GM-A6604/XEUC
+

7
7

B-Rch(-)

+
B-Rch LOW

C450105400020

BASS BOOST C450101400020

FREQ
8

8
A-a A-b

A-a
A-b

21
E
A

D
C

F
B
 1 2 3 4

11. PCB CONNECTION DIAGRAM

11.1 PCB KIT
A NOTE FOR PCB DIAGRAMS
1.The parts mounted on this PCB
include all necessary parts for
A PCB KIT
several destination.
For further information for
respective destinations, be sure
to check with the schematic dia-
gram.
2.Viewpoint of PCB diagrams
Connector Capacitor

SIDE A

B
SIDE B
P.C.Board Chip Part
BOOST
BASS
FREQ
LPF/HPF

C
CH B
GAIN
SPEAKER INPUT

D
CH B
INPUT
CH A
SELECT
INPUT

E
GAIN
CH A
LPF/HPF

A
GM-A6604/XEUC
22
1 2 3 4
 5

5
6
6

GM-A6604/XEUC
7
7
8

8
B-Lch+ B-Lch- B-Rch- B-Rch+ SYSTEM GROUND POWER
A-Lch+ A-Lch- A-Rch- A-Rch+
FUSE 25A
FUSE 25A

CONTROL
SIDE A

SPEAKER OUTPUT

A
23
E
A

D
C

F
B
 1 2 3 4

A PCB KIT

A
GM-A6604/XEUC
24
1 2 3 4
5 6 7 8

A
SIDE B

A
GM-A6604/XEUC
5 6 7 8
25
 1 2 3 4

12. ELECTRICAL PARTS LIST

NOTE:
A Parts whose parts numbers are omitted are subject to being not supplied.
The part numbers shown below indicate chip components.
Chip Resistor
RS1/_S___J,RS1/__S___J
Chip Capacitor (except for CQS.....)
CKS....., CCS....., CSZS.....
The > mark found on some component parts indicates the importance of the safety factor of the part.
Therefore, when replacing, be sure to use parts of identical designation.
Meaning of the figures and others in the parentheses in the parts list.
B Example) IC 301 is on the point (face A, 91 of x-axis, and 111 of y-axis) of the corresponding
PC board.
IC 301 (A, 91, 111) IC NJM2068V
The expression of the unit in this manual is shown by u instead of . Please do not make a mistake.
Circuit Symbol and No. Part No. Circuit Symbol and No. Part No.
Q 50 Transistor J522010200210
Unit Number : 7028074061010
Unit Name : PCB Kit Q 70 Transistor J522011100210
Q 71 Transistor J522011100210
Q 72 Transistor J520010500210
C Q 128 Transistor J522011100210

A
Unit Number : 7028074061010
Q

Q
130

132
Transistor

Transistor
J5031304Y0050

J5223875Y0210
Unit Name : PCB Kit Q 133 Transistor J5201504Y0210
Q 134 Transistor J5223875Y0210
Q 135 Transistor J5201504Y0210
MISCELLANEOUS Q 136 Transistor J5201504Y0210

IC 1 IC J121456500060 Q 137 Transistor J5223875Y0210

IC 2 IC J121456500060 Q 138 Transistor J5031304Y0050
IC 3 IC J121456500060 Q 139 Transistor J5224373Y0210
IC 4 IC J121456500060 Q 140 Transistor J5201661Y0210
D IC 5 IC J121456500060 Q 141 Transistor J502446800010

IC 6 IC J121456500060 Q 142 Transistor J500169500010

IC 7 IC J121456500060 Q 160 Transistor J5223875Y0210
IC 8 IC J121456500060 Q 228 Transistor J522011100210
IC 9 IC J121456500060 Q 230 Transistor J5031304Y0050
IC 10 IC J121456500060 Q 232 Transistor J5223875Y0210

IC 12 IC J080004940010 Q 233 Transistor J5201504Y0210

Q 1 Transistor J5201504Y0210 Q 234 Transistor J5223875Y0210
Q 2 Transistor J522011100210 Q 235 Transistor J5201504Y0210
Q 3 Transistor J522011100210 Q 236 Transistor J5201504Y0210
Q 4 Transistor J522011100210 Q 237 Transistor J5223875Y0210
E
Q 5 Transistor J5201504Y0210 Q 238 Transistor J5031304Y0050
Q 6 Transistor J5201504Y0210 Q 239 Transistor J5224373Y0210
Q 9 Power MOS FET J544600600020 Q 240 Transistor J5201661Y0210
Q 10 Power MOS FET J544600600020 Q 241 Transistor J502446800010
Q 11 Power MOS FET J544600600020 Q 242 Transistor J500169500010

Q 12 Power MOS FET J544600600020 Q 260 Transistor J5223875Y0210

Q 20 Transistor J522010200210 Q 328 Transistor J522011100210
Q 21 Transistor J520010500210 Q 330 Transistor J5031304Y0050
Q 22 Transistor J522011100210 Q 332 Transistor J5223875Y0210
Q 23 Transistor J5223875Y0210 Q 333 Transistor J5201504Y0210
F Q 24 Transistor J5223875Y0210 Q 334 Transistor J5223875Y0210
Q 26 Transistor J520010500210 Q 335 Transistor J5201504Y0210
Q 28 Transistor J522011100210 Q 336 Transistor J5201504Y0210
Q 29 Transistor J5201661Y0210 Q 337 Transistor J5223875Y0210
GM-A6604/XEUC
26
1 2 3 4
 5 6 7 8
Circuit Symbol and No. Part No. Circuit Symbol and No. Part No.
Q 338 Transistor J5031304Y0050 VR1 Rotary VR 50 kohm(CH A GAIN) C450105300010

Q 339 Transistor J5224373Y0210 VR2 Rotary VR 50 kohm(CH B GAIN) C450105300010

Q 340 Transistor J5201661Y0210 VR4 Rotary VR 100 kohm(FREQ) C450101400020 A
Q 341 Transistor J502446800010 VR5 Rotary VR 500 kohm(BASS BOOST) C450105400020
Q 342 Transistor J500169500010
Q 360 Transistor J5223875Y0210 RESISTORS
Q 428 Transistor J522011100210 R 1 C200027360200
Q 430 Transistor J5031304Y0050 R 2 C200012360200
Q 432 Transistor J5223875Y0210 R 3 C200047260200
Q 433 Transistor J5201504Y0210 R 5 C200010360200
Q 434 Transistor J5223875Y0210 R 6 C200018360200

Q 435 Transistor J5201504Y0210 R 8 C200012260200

Q 436 Transistor J5201504Y0210 R 9 C200010460200
Q 437 Transistor J5223875Y0210 R 10 C200068260200 B
Q 438 Transistor J5031304Y0050 R 11 C200015260200
Q 439 Transistor J5224373Y0210 R 12 C200022360200

Q 440 Transistor J5201661Y0210 R 13 C200039360200

Q 441 Transistor J502446800010 R 14 C200039260200
Q 442 Transistor J500169500010 R 15 C200022260200
Q 460 Transistor J5223875Y0210 R 17 C200010260200
D 1 Diode K005041480030 R 18 C200010260200

D 2 Diode K005041480030 R 19 C200047260200

D 3 Diode K005041480030 R 20 C200047260200
D 4 Diode K005041480030 R 21 C200047260200
D 5 Diode K005041480030 R 24 C200012163301 C
D 6 Diode K041220001000 R 25 C200012163301

D 7 Diode K041220002000 R 26 C200012163301

D 10 Diode K06015R005520 R 27 C200012163301
D 12 Diode K005041480030 R 31 C200010061300
D 20 Diode K06015R005520 R 32 C200010061300
D 102 Diode K005041480030 R 36 N113137639130

D 103 Diode K005041480030 R 37 N113137639130

D 129 Diode K005041480030 R 38 N113137639130
D 135 Diode K005041480030 R 39 N113137639130
D 136 Diode K005041480030 R 40 C000056263520
D 137 Diode K005041480030 R 43 C000012263520 D

D 202 Diode K005041480030 R 45 C200033360200

D 203 Diode K005041480030 R 48 C200022060200
D 229 Diode K005041480030 R 53 C200047360200
D 235 Diode K005041480030 R 54 C200018241200
D 236 Diode K005041480030 R 55 C200082260200

D 237 Diode K005041480030 R 56 C200022360200

D 302 Diode K005041480030 R 57 C200022360200
D 303 Diode K005041480030 R 60 C200033360200
D 335 Diode K005041480030 R 61 C200047260200
D 336 Diode K005041480030 R 62 C200047360200
E

D 337 Diode K005041480030 R 63 C200033360200

D 402 Diode K005041480030 R 64 C200033260200
D 403 Diode K005041480030 R 65 C200010260200
D 435 Diode K005041480030 R 66 C200022360200
D 436 Diode K005041480030 R 69 C200047260200

D 437 Diode K005041480030 R 71 C200010460200

LED1 Blue LED K500036001330 R 72 C200056260200
L 1 Choke Coil D330200100030 R 74 C200047360200
T 1 Transformer 8200450180030 R 75 C200047360200
TH1 SMD Thermistor F340184730010 R 76 C200010360200
F
TH2 SMD Thermistor F340184730010 R 79 C200010460200
SW1 Slide Switch(CH A LPF/HPF) G060231900020 R 101 C200010260200
SW2 Slide Switch(CH B LPF/HPF) G060231900020 R 102 C200047260200
SW3 Slide Switch(INPUT SELECT) G060221900020
GM-A6604/XEUC
5 6 7 8
27
 1 2 3 4
Circuit Symbol and No. Part No. Circuit Symbol and No. Part No.
R 103 C200039210200 R 206 C200010360200
R 104 C200022360200 R 213 C200010360200

R 105 C200015360200 R 214 C200010360200

A
R 106 C200010360200 R 215 C200010360200
R 114 C200033360200 R 216 C200033360200
R 115 C200033360200 R 217 C200018360200
R 116 C200033360200 R 218 C200056360200

R 117 C200018360200 R 225 C200022360200

R 118 C200056360200 R 226 C200033260200
R 125 C200022360200 R 228 C200030260200
R 126 C200033260200 R 229 C200056260200
R 128 C200030260200 R 230 C200068260200

R 129 C200056260200 R 231 C200068260200

B R 130 C200068260200 R 232 C200022060200
R 131 C200068260200 R 233 C200022060200
R 132 C200022060200 R 234 C200022060200
R 133 C200022060200 R 235 C200022060200

R 134 C200022060200 R 237 C200012260200

R 135 C200022060200 R 238 C200012260200
R 137 C200012260200 R 240 C200022160200
R 138 C200012260200 R 241 C200015161300
R 140 C200022160200 R 242 C200047240200

R 141 C200015161300 R 243 C200010140200

R 142 C200047240200 R 244 C200018241200
C R 143 C200010140200 R 245 C200015161300
R 144 C200018241200 R 246 C200015161300
R 145 C200015161300 R 247 C2004R7061300

R 146 C200015161300 R 249 C200056260200

R 147 C2004R7061300 R 250 C2004R7061300
R 149 C200056260200 R 252 C120R10067010
R 150 C2004R7061300 R 253 C120R10067010
R 152 C120R10067010 R 254 C2004R7061300

R 153 C120R10067010 R 255 C200015161300

R 154 C2004R7061300 R 260 C200047160200
R 155 C200015161300 R 261 C200056160200
D R 160 C200047160200 R 262 C200010360200
R 161 C200056160200 R 264 C200010360200

R 162 C200010360200 R 266 C200018360200

R 164 C200010360200 R 270 C200033360200
R 166 C200018360200 R 271 C200033360200
R 167 C200000060201 R 273 C200047460200
R 170 C200033360200 R 279 C200010460200

R 171 C200033360200 R 280 C200020363300

R 173 C200047460200 R 281 C200027360200
R 179 C200010460200 R 282 C200027360200
R 180 C200022363300 R 283 C200039210200
E
R 181 C200027360200 R 284 C200039210200

R 182 C200027360200 R 285 C200022310200

R 183 C200039210200 R 286 C200039210200
R 184 C200039210200 R 287 C200022310200
R 185 C200022310200 R 288 C200015160200
R 186 C200039210200 R 301 C200010260200

R 187 C200022310200 R 302 C200047260200

R 188 C200015160200 R 303 C200039210200
R 190 C200010260200 R 304 C200022360200
R 201 C200010260200 R 305 C200015360200
F
R 202 C200047260200 R 306 C200010360200

R 203 C200039210200 R 307 C200015360200

R 204 C200022360200 R 308 C200012460200
R 205 C200015360200 R 309 C200068360200
GM-A6604/XEUC
28
1 2 3 4
 5 6 7 8
Circuit Symbol and No. Part No. Circuit Symbol and No. Part No.
R 310 C200068360200 R 409 C200068360200
R 311 C200033360200 R 410 C200068360200

R 312 C200022360200 R 411 C200033360200 A

R 314 C200082260200 R 412 C200022360200
R 315 C200068260200 R 413 C200010360200
R 316 C200033360200 R 414 C200010360200
R 317 C200056360200 R 415 C200010360200

R 318 C200082260200 R 416 C200033360200

R 319 C200047260200 R 417 C200056360200
R 320 C200010360200 R 418 C200082260200
R 325 C200022360200 R 419 C200047260200
R 326 C200033260200 R 420 C200012460200

R 328 C200030260200 R 425 C200022360200

R 329 C200056260200 R 426 C200033260200 B
R 330 C200068260200 R 429 C200056260200
R 331 C200068260200 R 430 C200068260200
R 332 C200022060200 R 431 C200068260200

R 333 C200022060200 R 432 C200022060200

R 334 C200022060200 R 433 C200022060200
R 335 C200022060200 R 434 C200022060200
R 337 C200012260200 R 435 C200022060200
R 338 C200012260200 R 437 C200012260200

R 340 C200022160200 R 438 C200012260200

R 341 C200015161300 R 440 C200022160200
R 342 C200047240200 R 441 C200015161300 C
R 343 C200010140200 R 442 C200047240200
R 344 C200018241200 R 443 C200010140200

R 345 C200015161300 R 444 C200018241200

R 346 C200015161300 R 445 C200015161300
R 347 C2004R7061300 R 446 C200015161300
R 349 C200056260200 R 447 C2004R7061300
R 350 C2004R7061300 R 449 C200056260200

R 352 C120R10067010 R 450 C2004R7061300

R 353 C120R10067010 R 452 C120R10067010
R 354 C2004R7061300 R 453 C120R10067010
R 355 C200015161300 R 454 C2004R7061300 D
R 360 C200047160200 R 455 C200015161300

R 361 C200056160200 R 460 C200047160200

R 362 C200010360200 R 461 C200056160200
R 364 C200010360200 R 462 C200010360200
R 366 C200018360200 R 464 C200010360200
R 370 C200033360200 R 466 C200018360200

R 371 C200033360200 R 470 C200033360200

R 380 C200020363300 R 471 C200033360200
R 381 C200027360200 R 480 C200020363300
R 382 C200027360200 R 481 C200027360200
E
R 383 C200039210200 R 482 C200027360200

R 384 C200039210200 R 483 C200039210200

R 385 C200022310200 R 484 C200039210200
R 386 C200039210200 R 485 C200022310200
R 387 C200022310200 R 486 C200039210200
R 388 C200015160200 R 487 C200022310200

R 401 C200010260200 R 488 C200015160200

R 402 C200047260200
R 403 C200039210200 CAPACITORS
R 404 C200022360200
R 405 C200015360200 C 1 D040100087070 F
C 2 D011104777200
R 406 C200010360200 C 3 D040470083080
R 407 C200015360200 C 4 D011103777200
R 408 C200012460200
GM-A6604/XEUC
5 6 7 8
29
 1 2 3 4
Circuit Symbol and No. Part No. Circuit Symbol and No. Part No.
C 6 D010472167200 C 202 D011102777200

C 7 D040470083080 C 203 D010150167200

C 10 D011102777200 C 204 D010150167200
A
C 11 D011102777200 C 210 D011563777200
C 12 D041332083000 C 211 D011563777200
C 13 D041332083000 C 228 D01147177C201

C 14 D0404R7087250 C 229 D041471083060

C 15 D011104777200 C 230 D040100087070
C 16 D011104777200 C 232 D01182077C201
C 17 D040101084060 C 233 D010470167200
C 18 D011105777302 C 234 D040471082060

C 19 D040100087070 C 235 D010470167200

C 23 D041332087010 C 236 D01182077C201
B C 24 D041332087010 C 237 D011473777200
C 34 D0402R2087160 C 238 D011104777200
C 35 D041221084050 C 239 D011103777200

C 36 D041221084050 C 241 D01147177C201

C 37 D011104777200 C 242 D01147177C201
C 41 D040470083080 C 260 D011105774201
C 46 D040010087150 C 270 D011104777200
C 50 D040220087060 C 271 D011104577160

C 52 D011104777200 C 278 D010221167160

C 62 D011104777200 C 279 D010221167160
C 70 D011106574300 C 280 D040100087070
C C 101 D040100087070 C 281 D040100087070
C 102 D011102777200 C 282 D010470167200

C 103 D010150167200 C 284 D010150167200

C 104 D010150167200 C 285 D010470167200
C 110 D011563777200 C 286 D040470083080
C 111 D011563777200 C 301 D040100087070
C 112 D011563777200 C 302 D011102777200

C 113 D011273777200 C 303 D010150167200

C 114 D011104777200 C 304 D010150167200
C 128 D01147177C201 C 305 D011273777200
C 129 D041471083060 C 306 D011273777200
D C 130 D040100087070 C 307 D011683777200

C 132 D01182077C201 C 310 D011563777200

C 133 D010470167200 C 311 D011563777200
C 134 D040471082060 C 313 D011273777200
C 135 D010470167200 C 314 D011683777200
C 136 D01182077C201 C 318 D011104777200

C 137 D011473777200 C 328 D01147177C201

C 138 D011104777200 C 330 D040100087070
C 139 D011103777200 C 332 D01182077C201
C 141 D01147177C201 C 333 D010470167200
C 142 D01147177C201 C 334 D040471082060
E

C 160 D011105774201 C 335 D010470167200

C 171 D011104577160 C 336 D01182077C201
C 178 D010221167160 C 337 D011473777200
C 179 D010221167160 C 338 D011104777200
C 180 D040100087070 C 339 D011103777200

C 181 D040100087070 C 341 D01147177C201

C 182 D010470167200 C 342 D01147177C201
C 184 D010150167200 C 360 D011105774201
C 185 D010470167200 C 371 D011104577160
C 186 D040470083080 C 378 D010221167160
F
C 190 D010101167200 C 379 D010221167160
C 193 D011104777200 C 380 D040100087070
C 194 D011104777200 C 381 D040100087070
C 201 D040100087070 C 382 D010470167200
GM-A6604/XEUC
30
1 2 3 4
 5 6 7 8
Circuit Symbol and No. Part No.
C 384 D010150167200

C 385 D010470167200
C 386 D040470083080 A
C 393 D011104777200
C 401 D040100087070
C 402 D011102777200

C 403 D010150167200
C 404 D010150167200
C 405 D011273777200
C 406 D011273777200
C 407 D011683777200

C 410 D011563777200
C 411 D011563777200
C 418 D011104777200 B
C 428 D01147177C201
C 430 D040100087070

C 432 D01182077C201
C 433 D010470167200
C 434 D040471082060
C 435 D010470167200
C 436 D01182077C201

C 437 D011473777200
C 438 D011104777200
C 439 D011103777200
C 441 D01147177C201 C
C 442 D01147177C201

C 460 D011105774201
C 471 D011104577160
C 478 D010221167160
C 479 D010221167160
C 480 D040100087070

C 481 D040100087070
C 482 D010470167200
C 484 D010150167200
C 485 D010470167200
C 486 D040470083080 D

C 494 D011104777200

GM-A6604/XEUC
5 6 7 8
31