Pioneer GM-X944 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. MAR. 2000 Printed in Japan
ORDER NO.
CRT2483
BRIDGEABLE FOUR-CHANNEL POWER AMPLIFIER
GM-X944 X1R/UC,EW,ES
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........................................18
6. ADJUSTMENT .........................................................24
7. GENERAL INFORMATION.......................................25
7.1 DISASSEMBLY ..................................................25
8. OPERATIONS AND SPECIFICATIONS ....................26
GM-X944/X1R/UC

2
GM-X944
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
1. SAFETY INFORMATION
-GM-X944/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-X944
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.
-Owner's Manual
Model Part No. Language
GM-X944/X1R/UC HRD0138 English, French
GM-X944/X1R/EW HRD0139 English, Spanish, German,
French, Italian, Dutch
GM-X944/X1R/ES HRD0140 English, Spanish
HRD0141 Portuguese(B), Arabic
-PACKING SECTION PARTS LIST
Part No.
Mark No. Description GM-X944/X1R/UC GM-X944/X1R/EW GM-X944/X1R/ES
1 •••••
2 Screw BYC40P180FZK BYC40P180FZK BYC40P180FZK
3 Polyethylene Bag HEG0011 HEG0011 HEG0011
4 Polyethylene Bag HEG0021 HEG0021 HEG0021
5 Carton HHG0248 HHG0249 HHG0250
6 Contain Box HHL0248 HHL0249 HHL0250
7 Protector HHP0079 HHP0079 HHP0079
8-1 Owner’s Manual HRD0138 HRD0139 HRD0140
8-2 Owner’s Manual Not used Not used HRD0141
* 8-3 Warranty Card Not used HRY1157 Not used
* 8-4 Card ARY1048 Not used Not used
* 8-5 PRC HRY0012 Not used Not used
9 Cover HNS0101 HNS0101 HNS0101
10 Protector HHP0096 HHP0096 HHP0096

4
GM-X944
2.2 EXTERIOR

5
GM-X944
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
1 Screw BSZ30P050FZK
2 Screw(M3x12) CBA1323
3 Screw(M3x5) HBA0006
4 Screw(M3x8) HBA0011
5 Screw(M2.6x6) HBA0012
6 Screw(M3x16) HBA0020
7 Panel See Contrast table(2)
8 Case See Contrast table(2)
9 Holder HNC0078
10 Heat Sink See Contrast table(2)
11 Plate HNS0077
12 Plate HNS0080
13 Cover HNS0101
14 Spacer HNV0016
15 Amp Unit See Contrast table(2)
16 Screw BBZ30P060FMC
17 Screw(M3x14) CBA1382
18 Terminal(CN905) CKF1059
19 Plug(CN906) CKS1035
20 Connector(CN101) CKS3146
21 Connector(CN103) CKS3146
22 Fuse HEK0030
23 Pin Jack(CN852) HKB0002
24 Pin Jack(CN851) HKB0006
25 Fuse Holder HKE0012
26 Terminal(CN901) HKE0020
27 Connector(CN301) HKE0030
28 Clip HNC0054
29 Holder HNC0076
30 Bar HNR0124
31 Heat Sink HNR0148
32 Heat Sink HNR0149
33 Network Unit See Contrast table(2)
34 Connector(CN102) CKS3145
35 Connector(CN104) CKS3145
36 Clip HNC0054
37 Screw PPZ30P100SAD
38 Light Pipe Unit HXA0322
39 Fan Motor HXM0001
40 Screw PPZ30P100FZK
41 Thermistor(TH901, 902) CCX1013
42 Thermistor(TH904) CCX1027
43 FET 94-4981
(Q361, 362, 363, 364, 365, 366, 367, 368)
44 FET STP50NE08
(Q905, 906, 911, 912, 913, 914)
45 Transistor(Q907) 2SD2395
46 Diode(D910) FML22R
47 Transistor(Q908) 2SB1566
48 Diode(D907) FML22S
49 FET 94-4980
(Q353, 354, 355, 356, 357, 358, 359, 360)
50 Screw BBZ30P140FMC
51 Screw BBZ30P060FMC
(2) CONTRAST TABLE
GM-X944/X1R/UC, EW and ES are constructed the same except for the following:
Part No.
Mark No. Description GM-X944/X1R/UC GM-X944/X1R/EW GM-X944/X1R/ES
7 Panel HNB0121 HNB0104 HNB0121
8 Case HNB0122 HNB0106 HNB0122
10 Heat Sink HNR0160 HNR0165 HNR0160
15 Amp Unit HWH0134 HWH0123 HWH0135
33 Network Unit HWG0020 HWG0016 HWG0021

NETWORK PCB(A)
NETWORK PCB(B)
AMP UNIT
CN851
CN851
CN852
CN852
CN851
CN851
CN101 CN102
CN102-2 CN101-2
CN103 CN104
CN104-2 CN103-2
ISOLATOR
GAIN=1
ISOLATOR
GAIN=1
RCA OUT
GAIN=1
HP/LP FILTER
12dB/OCTAVE
BP FILTER
LOW-X TO HIGH-X
HP/LP FILTER
12dB/OCTAVE
POWER SUPPLY
HIGH XOVER
3k-9kHz
LOW XOVER
40-120Hz
HIGH XOVER
3k-9kHz
LOW XOVER
40-120Hz NETWORK UNIT
Consists of
•NETWORK PCB
•NETWORK PCB
FAN MOTOR HXM0001
6
GM-X944
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
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
A B C
C
B
A

CN301
CN301
CN903
CN904
CN902
CN901
AMP
GAIN=8.5-33dB
AMP
GAIN=8.5-33dB
IT
CB(A)
CB(B)
GM-X944/X1R/EW, ES
CN906
220
HZS12L(A3)
7
GM-X944
5678
A
B
C
D
5678
A-b
A

8
GM-X944
A
1234
B
C
D
1234
NETWORK PCB(A)
AMP UNIT
CN851 CN851 CN852
CN851 CN851
CN101
CN102
CN102-2
CN101-2
CN103
CN104
CN104-2
CN103-2
ISOLATOR GAIN=1 ISOLATOR GAIN=1
RCA OUT GAIN=1
HP/LP FILTER 12dB/OCTAVE
BP FILTER LOW-X TO HIGH-X
HIGH XOVER 3k-9kHz LOW XOVER 40-120Hz NETWORK UNIT
Consists of •NETWORK PCB(A) •NETWORK PCB(B)
A-a
A-a A-b
1
B C
B
A

9
GM-X944
5678
A
B
C
D
5678
NETWORK PCB(B)
CN852
HP/LP FILTER 12dB/OCTAVE
POWER SUPPLY
HIGH XOVER 3k-9kHz LOW XOVER 40-120Hz
G
CN906
FAN MOTOR
HXM0001
A-a
A-a A-b
2 3
C
C

10
GM-X944
A
1234
B
C
D
1234
CN301 CN301
AMP GAIN=8.5-33dB AMP GAIN=8.5-33dB
T
B(A) B(B)
A-a A-b
A-b
1

11
GM-X944
5678
A
B
C
D
5678
CN903 CN904 CN902 CN901
GM-X944/X1R/EW, ES
CN906
220
HZS12L(A3)
A-a A-b
A-b
2
3

12
GM-X944
A
1234
B
C
D
1234
A
AMP UNIT
4. PCB CONNECTION DIAGRAM
4.1 AMP UNIT
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB
include all necessary parts for
several destination.
For further information for
respective destinations, be sure
to check with the schematic
diagram.
2. Viewpoint of PCB diagrams
Capacitor
Connector
P.C.Board Chip Part
SIDE A
SIDE B
A
4CH
†
2CH
C
CN104
B
CN102

13
GM-X944
5678
A
B
C
D
5678
A
BFC
SIDE A
FAN MOTOR

14
GM-X944
A
1234
B
C
D
1234
A
A
AMP UNIT

15
GM-X944
5678
A
B
C
D
5678
A
SIDE B

16
GM-X944
A
1234
B
C
D
1234
4.2 NETWORK PCB(A)
OFF, LPF, HPF, BPF LOW, HIGH
SIDE A
SIDE B
BNETWORK PCB(A)
BNETWORK PCB(A)
B
CN101
A

17
GM-X944
1234
A
B
C
D
1234
4.3 NETWORK PCB(B)
OFF, LPF, HPFLOW, HIGH
SIDE A
SIDE B
CNETWORK PCB(B)
CNETWORK PCB(B)
C
CN103
A

18
GM-X944
R 126 RS1/10S103J
R 127 RS1/10S472J
R 128 RS1/10S472J
R 129 RS1/10S103J
R 130 RS1/10S103J
R 131 RS1/10S562J
R 132 RS1/10S562J
R 133 RS1/10S103J
R 134 RS1/10S103J
R 135 RS1/10S103J
R 136 RS1/10S103J
R 137 RS1/10S103J
R 138 RS1/10S103J
R 143 RS1/10S102J
R 144 RS1/10S102J
R 145 RS1/10S102J
R 146 RS1/10S102J
R 147 RS1/10S562J
R 148 RS1/10S562J
R 149 RS1/10S103J
R 150 RS1/10S103J
R 151 RS1/10S562J
R 152 RS1/10S562J
R 153 RS1/10S103J
R 154 RS1/10S103J
CAPACITORS
C 101 CKSQYB184K16
C 102 CKSQYB184K16
C 103 CKSQYB222K50
C 104 CKSQYB222K50
C 105 CKSQYB823K50
C 106 CKSQYB823K50
C 107 CKSQYB103K25
C 108 CKSQYB103K25
C 109 CKSQYB122K50
C 110 CKSQYB122K50
C 111 CKSQYB184K16
C 112 CKSQYB184K16
C 113 CKSQYB184K16
C 114 CKSQYB184K16
C 115 CKSQYB184K16
C 116 CKSQYB184K16
C 117 CKSQYB184K16
C 118 CKSQYB184K16
C 119 CCSQCH470J50
C 120 CCSQCH470J50
C 121 CFTLA124J50
C 122 CFTLA124J50
C 123 CKSQYB182K50
C 124 CKSQYB182K50
C 125 CFTLA124J50
5. ELECTRICAL PARTS LIST
NOTE:
-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.....
Network Unit
Consists of
Network PCB(A)
Network PCB(B)
Unit Number : HWG0020(GM-X944/X1R/UC)
: HWG0016(GM-X944/X1R/EW)
: HWG0021(GM-X944/X1R/ES)
Unit Name : Network Unit
MISCELLANEOUS
IC 101 IC NJM2068D
IC 102 IC NJM2068D
IC 103 IC NJM2068D
IC 104 IC NJM2068D
IC 105 IC NJM2068D
IC 106 IC NJM2068D
IC 107 IC NJM2068D
IC 108 IC NJM2068D
S 101 Switch(OFF, LPF, HPF, BPF) HSH0002
S 102 Switch(OFF, LPF, HPF) CSH1029
S 103 Slide Switch(LOW, HIGH) CSH1042
S 104 Slide Switch(LOW, HIGH) CSH1042
VR 101 Variable Resistor 20kΩ(E) CCS1266
VR 102 Volume 20kΩ(E) HCS0002
VR 103 Variable Resistor 20kΩ(E) CCS1266
RESISTORS
R 101 RS1/10S113J
R 102 RS1/10S113J
R 103 RS1/10S113J
R 104 RS1/10S113J
R 105 RS1/10S822J
R 106 RS1/10S822J
R 107 RS1/10S822J
R 108 RS1/10S822J
R 109 RS1/10S102J
R 110 RS1/10S102J
R 111 RS1/10S182J
R 112 RS1/10S182J
R 113 RS1/10S822J
R 114 RS1/10S822J
R 115 RS1/10S822J
R 116 RS1/10S822J
R 117 RS1/10S102J
R 118 RS1/10S102J
R 119 RS1/10S182J
R 120 RS1/10S182J
R 121 RS1/10S103J
R 122 RS1/10S103J
R 123 RS1/10S103J
R 124 RS1/10S103J
R 125 RS1/10S103J
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------
B C

19
GM-X944
C 126 CFTLA124J50
C 127 CKSQYB182K50
C 128 CKSQYB182K50
Unit Number : HWH0134(GM-X944/X1R/UC)
: HWH0123(GM-X944/X1R/EW)
: HWH0135(GM-X944/X1R/ES)
Unit Name : Amp Unit
MISCELLANEOUS
IC 201 IC NJM2068D
IC 202 IC NJM2068D
IC 651 IC PA2027A
IC 851 IC NJM2068D
IC 852 IC NJM2068D
IC 853 IC NJM2068D
IC 854 IC NJM2068D
IC 855 IC NJM2068D
IC 901 IC UPC494C
Q 201 Transistor 2SC2458
Q 202 Transistor 2SC2458
Q 203 Transistor 2SC2458
Q 204 Transistor 2SC2458
Q 205 Transistor DTA124ES
Q 301 Transistor 2SA992
Q 302 Transistor 2SA992
Q 303 Transistor 2SA992
Q 304 Transistor 2SA992
Q 305 Transistor 2SC1845
Q 306 Transistor 2SC1845
Q 307 Transistor 2SC1845
Q 308 Transistor 2SC1845
Q 309 Transistor 2SK389
Q 310 Transistor 2SK389
Q 311 Transistor 2SK389
Q 312 Transistor 2SK389
Q 313 Transistor 2SC1845
Q 314 Transistor 2SC1845
Q 315 Transistor 2SC1845
Q 316 Transistor 2SC1845
Q 317 Transistor 2SC1845
Q 318 Transistor 2SC1845
Q 319 Transistor 2SC1845
Q 320 Transistor 2SC1845
Q 321 Transistor 2SA992
Q 322 Transistor 2SA992
Q 323 Transistor 2SA992
Q 324 Transistor 2SA992
Q 325 Transistor 2SA992
Q 326 Transistor 2SA992
Q 327 Transistor 2SA992
Q 328 Transistor 2SA992
Q 329 Transistor 2SA970
Q 330 Transistor 2SA970
Q 331 Transistor 2SA970
Q 332 Transistor 2SA970
Q 337 Transistor 2SC2240
Q 338 Transistor 2SC2240
Q 339 Transistor 2SC2240
Q 340 Transistor 2SC2240
Q 341 Transistor 2SC1845
Q 342 Transistor 2SC1845
Q 343 Transistor 2SC1845
Q 344 Transistor 2SC1845
Q 345 Transistor 2SC2240
Q 346 Transistor 2SC2240
Q 347 Transistor 2SC2240
Q 348 Transistor 2SC2240
Q 349 Transistor 2SA970
Q 350 Transistor 2SA970
Q 351 Transistor 2SA970
Q 352 Transistor 2SA970
Q 353 FET 94-4980
Q 354 FET 94-4980
Q 355 FET 94-4980
Q 356 FET 94-4980
Q 357 FET 94-4980
Q 358 FET 94-4980
Q 359 FET 94-4980
Q 360 FET 94-4980
Q 361 FET 94-4981
Q 362 FET 94-4981
Q 363 FET 94-4981
Q 364 FET 94-4981
Q 365 FET 94-4981
Q 366 FET 94-4981
Q 367 FET 94-4981
Q 368 FET 94-4981
Q 653 Transistor 2SA1048
Q 654 Transistor 2SC2458
Q 655 Transistor 2SC2458
Q 657 Transistor 2SA1048
Q 658 Transistor 2SC2458
Q 659 Transistor 2SA1048
Q 660 Transistor 2SB1243
Q 661 Transistor 2SC2458
Q 663 Transistor 2SD1768S
Q 664 Transistor 2SD1768S
Q 665 Transistor 2SD1768S
Q 666 Transistor 2SD1768S
Q 902 Transistor 2SA1048
Q 903 Transistor 2SB1277
Q 904 Transistor 2SB1277
Q 905 FET STP50NE08
Q 906 FET STP50NE08
Q 907 Transistor 2SD2395
Q 908 Transistor 2SB1566
Q 909 Transistor 2SD1919
Q 910 Transistor 2SD1919
Q 911 FET STP50NE08
Q 912 FET STP50NE08
Q 913 FET STP50NE08
Q 914 FET STP50NE08
Q 915 Transistor 2SD1864
Q 916 Transistor 2SC2458
Q 917 Transistor 2SB1243
D 301 Diode HZS6L(C1)
D 302 Diode HZS6L(C1)
D 303 Diode HZS6L(C1)
D 304 Diode HZS6L(C1)
D 313 Diode 1SS133
D 314 Diode 1SS133
D 315 Diode 1SS133
D 316 Diode 1SS133
D 317 Diode 1SS133
D 318 Diode 1SS133
D 319 Diode 1SS133
D 320 Diode 1SS133
D 321 Diode RD5R1ES(B2)
D 322 Diode RD5R1ES(B2)
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------
A

20
GM-X944
D 323 Diode RD5R1ES(B2)
D 324 Diode RD5R1ES(B2)
D 602 LED SML210LT(LMN)
D 651 Diode RM4Z
D 652 Diode RM4Z
D 653 Diode 1SS133
D 654 Diode HZS7L(B2)
D 655 Diode ERA15-02VH
D 656 Diode ERA15-02VH
D 658 Diode 1SS133
D 659 Diode 1SS133
D 661 Diode 1SS133
D 662 Diode 1SS133
D 663 Diode 1SS133
D 664 Diode 1SS133
D 665 Diode 1SS133
D 907 Diode FML22S
D 908 Diode HZS16L(1)
D 909 Diode HZS16L(1)
D 910 Diode FML22R
D 912 Diode ALO1ZWS
D 913 Diode ALO1ZWS
D 914 Diode ALO1ZWS
D 915 Diode ALO1ZWS
D 916 Diode HZS12L(A3)
L 851 Ferri-Inductor CTF1007
L 852 Ferri-Inductor CTF1007
L 853 Ferri-Inductor CTF1007
L 854 Ferri-Inductor CTF1007
L 901 Choke Coil 50mH CTH1144
T 901 Transformer HTT0010
TH 901 Thermistor CCX1013
TH 902 Thermistor CCX1013
TH 903 Thermistor CCX1035
TH 904 Thermistor CCX1027
S 851 Slide Switch(4CH†2CH) CSH1042
S 901 Switch(BFC)(GM-X944/X1R/EW, ES) HSH-156
VR 201 Variable Resistor 10kΩ(A) CCS1265
VR 202 Variable Resistor 10kΩ(A) CCS1265
VR 501 Semi-fixed 10kΩ(B) CCP1206
VR 502 Semi-fixed 10kΩ(B) CCP1206
VR 503 Semi-fixed 10kΩ(B) CCP1206
VR 504 Semi-fixed 10kΩ(B) CCP1206
FU 902 Fuse 30A HEK0030
FU 903 Fuse 30A HEK0030
FU 904 Fuse 30A HEK0030
Network Unit(GM-X944/X1R/UC) HWG0020
Network Unit(GM-X944/X1R/EW) HWG0016
Network Unit(GM-X944/X1R/ES) HWG0021
RESISTORS
R 141 RS1/10S222J
R 142 RS1/10S222J
R 201 RD1/4PU472J
R 202 RD1/4PU472J
R 203 RD1/4PU472J
R 204 RD1/4PU472J
R 211 RD1/4PU111J
R 212 RD1/4PU111J
R 213 RD1/4PU111J
R 214 RD1/4PU111J
R 215 RS1/10S202J
R 216 RS1/10S202J
R 217 RS1/10S202J
R 218 RS1/10S202J
R 219 RS1/10S163J
R 220 RS1/10S163J
R 221 RS1/10S163J
R 222 RS1/10S163J
R 301 RS1/10S301J
R 302 RS1/10S301J
R 303 RS1/10S301J
R 304 RS1/10S301J
R 305 RS1/10S183J
R 306 RS1/10S183J
R 307 RS1/10S183J
R 308 RS1/10S183J
R 309 RD1/4PU221J
R 310 RD1/4PU221J
R 311 RD1/4PU221J
R 312 RD1/4PU221J
R 313 RD1/4PU680J
R 314 RD1/4PU680J
R 315 RD1/4PU680J
R 316 RD1/4PU680J
R 317 RD1/4PU680J
R 318 RD1/4PU680J
R 319 RD1/4PU680J
R 320 RD1/4PU680J
R 321 RD1/4PU332J
R 322 RD1/4PU332J
R 323 RD1/4PU332J
R 324 RD1/4PU332J
R 325 RD1/4PU101J
R 326 RD1/4PU101J
R 327 RD1/4PU101J
R 328 RD1/4PU101J
R 329 RD1/4PU153J
R 330 RD1/4PU153J
R 331 RD1/4PU153J
R 332 RD1/4PU153J
R 333 RD1/4PU181J
R 334 RD1/4PU181J
R 335 RD1/4PU181J
R 336 RD1/4PU181J
R 337 RD1/4PU432J
R 338 RD1/4PU432J
R 339 RD1/4PU432J
R 340 RD1/4PU432J
R 341 RD1/4PU221J
R 342 RD1/4PU221J
R 343 RD1/4PU221J
R 344 RD1/4PU221J
R 345 RD1/4PU471J
R 346 RD1/4PU471J
R 347 RD1/4PU471J
R 348 RD1/4PU471J
R 353 RD1/4PU183J
R 354 RD1/4PU183J
R 355 RD1/4PU183J
R 356 RD1/4PU183J
R 357 RD1/4PU332J
R 358 RD1/4PU332J
R 359 RD1/4PU332J
R 360 RD1/4PU332J
R 361 RD1/4PU181J
R 362 RD1/4PU181J
R 363 RD1/4PU181J
R 364 RD1/4PU181J
R 369 RD1/4PU163J
R 370 RD1/4PU163J
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------
=====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ -------------------------