Pioneer GM-X644 User manual

PIONEER CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan
PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A.
PIONEER EUROPE N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium
PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2000 K-ZZA. FEB. 2000 Printed in Japan
ORDER NO.
CRT2479
BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER
GM-X644 X1R/UC,EW
Service
Manual
CONTENTS
1. SAFETY INFORMATION............................................2
2. EXPLODED VIEWS AND PARTS LIST ......................2
3. SCHEMATIC DIAGRAM.............................................6
4. PCB CONNECTION DIAGRAM................................12
5. ELECTRICAL PARTS LIST........................................16
6. ADJUSTMENT .........................................................20
7. GENERAL INFORMATION.......................................21
7.1 DISASSEMBLY ..................................................21
8. OPERATIONS AND SPECIFICATIONS ....................22
GM-X544 X1R/UC,ES
GM-X644/X1R/UC

2
GM-X644,X544
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
1. SAFETY INFORMATION
-GM-X644/X1R/UC, GM-X544/X1R/UC
CAUTION
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 contains lead in solder and certain electrical parts contain chemicals which are known to the state of
California to cause cancer, birth defects or other reproductive harm.
Health & Safety Code Section 25249.6 - Proposition 65

3
GM-X644,X544
NOTE:
-Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.
-Screws adjacent to ∇mark on the product are used for disassembly.
-PACKING SECTION PARTS LIST
Part No.
Mark No. Description GM-X644/X1R/UC GM-X644/X1R/EW GM-X544/X1R/UC GM-X544/X1R/ES
1 •••••
2 Screw BYC40P180FZK BYC40P180FZK BYC40P180FZK BYC40P180FZK
3 Polyethylene Bag HEG0011 HEG0011 HEG0011 HEG0011
4 Polyethylene Bag HEG0013 HEG0013 HEG0013 HEG0013
5 Carton HHG0237 HHG0238 HHG0236 HHG0239
6 Contain Box HHL0237 HHL0238 HHL0236 HHL0239
7 Protector HHP0076 HHP0076 HHP0076 HHP0076
8-1 Owner’s Manual HRD0132 HRD0133 HRD0131 HRD0134
8-2 Owner’s Manual Not used Not used Not used HRD0142
* 8-3 PRC HRY0012 Not used HRY0012 Not used
* 8-4 Warranty Card Not used HRY1157 Not used Not used
* 8-5 Card Not used Not used ARY1048 Not used
9 Cover HNS0101 HNS0101 HNS0101 HNS0101
-Owner's Manual
Model Part No. Language
GM-X644/X1R/UC HRD0132 English, French
GM-X644/X1R/EW HRD0133 English, Spanish, German,
French, Italian, Dutch
GM-X544/X1R/UC HRD0131 English, French
GM-X544/X1R/ES HRD0134 English, Spanish
HRD0142 Portuguese(B), Arabic

4
GM-X644,X544
2.2 EXTERIOR

5
GM-X644,X544
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
1 Screw BBZ30P060FMC
2 Screw BBZ30P080FMC
3 Screw BSZ30P050FZK
4 Screw(M2.6x6) HBA0012
5 Panel See Contrast table(2)
6 Case See Contrast table(2)
7 Heat Sink See Contrast table(2)
8 Plate HNS0078
9 Plate HNS0080
10 Cover HNS0101
11 Amp Unit See Contrast table(2)
12 Terminal(CN902) CKF1059
13 Fuse(25A) HEK0025
14 Pin Jack(CN852) HKB0002
15 Pin Jack(CN851) HKB0006
16 Terminal(CN853) HKE0006
17 Connector(CN301) HKE0030
18 Clip HNC0054
19 Heat Sink HNR0166
20 Heat Sink HNR0167
21 Screw PPZ30P100SAD
22 Light Pipe Unit HXA0322
23 Screw PPZ30P100FZK
24 Fuse Holder HKE0012
25 Connector(CN601) HKE0020
26 Transistor(Q616) 2SD2395
27 Transistor(Q617) 2SB1566
28 Diode(D610) FML22S
29 Diode(D611) FML22R
30 Thermistor(TH601, 602) CCX1013
(2) CONTRAST TABLE
GM-X644/X1R/UC, EW and GM-X544/X1R/UC, ES are constructed the same except for the following:
Part No.
Mark No. Description GM-X644/X1R/UC GM-X644/X1R/EW GM-X544/X1R/UC GM-X544/X1R/ES
5 Panel HNB0109 HNB0109 HNB0110 HNB0110
6 Case HNB0115 HNB0115 HNB0113 HNB0113
7 Heat Sink HNR0157 HNR0157 HNR0155 HNR0155
11 Amp Unit HWH0117 HWH0126 HWH0125 HWH0127

HP/LP FILTER
40-120Hz
12dB/octave
POWER SUPPLY
ISOLATOR CIRCUIT
GAIN=1
RCA OUT L GAIN=1
RCA OUT R GAIN=1
4CH
↑↓
2CH
6
GM-X644,X544
A
1234
B
C
D
1234
A-a A-b
A-a
A-a
A-b
A-b
A-b
A-b
A-a
A-a
Large size
SCH diagram
Guide page
Detailed page
A
3. SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL PARTS
LIST”.
A-a

Decimal points for resistor
and capacitor fixed values
are expressed as :
2.2 2R2
0.022 R022
←
←
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.
Symbol indicates a resistor.
No differentiation is made between chip resistors and
discrete resistors.
NOTE :
Symbol indicates a capacitor.
No differentiation is made between chip capacitors and
discrete capacitors.
>
>
AMP
GAIN=7-31dB
AAMP UNIT
/EW, ES
OFF/LPF/HPF
OFF/LPF/HPF
BFC
HEK0025
HEK0025
1K(B)1K(B)1K(B)1K(B)
7
GM-X644,X544
5678
A
B
C
D
5678
A-b
A

8
GM-X644,X544
A
1234
B
C
D
1234
HP/LP FILTER
40-120Hz
12dB/octave
ISOLATOR CIRCUIT
GAIN=1
RCA OUT L GAIN=1
RCA OUT R GAIN=1
OFF
OFF/
4CH
↑↓
2CH
A-a
A-a A-b
1
2
3

9
GM-X644,X544
5678
A
B
C
D
5678
POWER SUPPLY /EW, ES BFC
A-a
A-a A-b
4
5

10
GM-X644,X544
A
1234
B
C
D
1234
AMP GAIN=7-31dB
AAMP UNIT
OFF/LPF/HPF
OFF/LPF/HPF
1K(B)1K(B)
A-a A-b
A-b
1
2
3