Sony XM-754SX Service Manual ▷ View online
1
1. ELECTRICAL ADJUSTMENT
Bias Adjustment
Note : The Bias adjustment should be performed only if any of
Q109 and Q110 for RV104, Q209 and Q210 for RV204,
Q309 and Q310 for RV304, and Q409 and Q410 for RV404
are replaced.
Q309 and Q310 for RV304, and Q409 and Q410 for RV404
are replaced.
Setting :
Procedure:
1. Rotate variable resistors RV104 (FRONT L-CH), RV204
1. Rotate variable resistors RV104 (FRONT L-CH), RV204
(FRONT R-CH), RV304 (REAR L-CH) and RV404 (REAR
R-CH) full clockwise as seen from the pattern side to minimize
the bias current.
R-CH) full clockwise as seen from the pattern side to minimize
the bias current.
2. The input signal is with no signal.
3. Connect the stabilized power supply between B+ and REM
3. Connect the stabilized power supply between B+ and REM
terminals and gradually increase the voltage to 14.4 V while
checking for any abnormal current.
checking for any abnormal current.
4. Adjust RV104 (FRONT L-CH), RV204 (FRONT R-CH), RV304
(REAR L-CH) and RV404 (REAR R-CH) so that the digital
voltmeter connected between the respective test points reads
2.5±0.5 mV.
voltmeter connected between the respective test points reads
2.5±0.5 mV.
US Model
Canadian Model
AEP Model
UK Model
E Model
SERVICE MANUAL
Ver 1.2 2002. 05
SUPPLEMENT-1
File this supplement with the service manual.
Subject : Change of Main Board
The main board has been changed for those sets that have their serial numbers of
3525794 and later. Consequently the value for bias adjustment is to be changed.
Check the serial number when servicing and inspecting.
3525794 and later. Consequently the value for bias adjustment is to be changed.
Check the serial number when servicing and inspecting.
(ENG-02004)
XM-754SX
+
_
Stabilized
Power supply
Digital
Voltmeter
B+,REM terminals
set
GND terminal
test points
TP31
TP32
TP42
TP41
TP21
TP22
TP11
TP12
– MAIN BOARD (CONDUCTOR SIDE) –
RV104
BIAS ADJUSTMENT
(FRONT L-CH)
RV204
BIAS ADJUSTMENT
(FRONT R-CH)
RV304
BIAS ADJUSTMENT
(REAR L-CH)
RV404
BIAS ADJUSTMENT
(REAR R-CH)
5. After this adjustment, verify that the current value of the
stabilized power supply is 1.2 to 1.6 A.
Adjustment Location :
RV Ref. No.
Test points
RV104
TP11 and TP12
RV204
TP21 and TP22
RV304
TP31 and TP32
RV404
TP41 and TP42
2
XM-754SX
• IC Block Diagram
IC901 µPC494GS-T1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OSC
REF. REG.
ERROR
ERROR
0.1V
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
• 2 : nonflammable resistor.
Note:
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
The components identi-
fied by mark 0 or dotted
line with mark 0 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
• A : B+ Line.
• B : B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
• B : B– Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REM terminals.
• Voltage is dc with respect to ground under no-signal
condition.
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: AUDIO
for printed wiring boards:
Note:
• X : parts extracted from the component side.
•
Note:
• X : parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• (
) : Refer to page of Supplement-1.
• (( )) : Refer to page of Service manual.
Q204
E-10
Q207
D-11
Q208
E-11
Q209
D-12
Q210
E-12
Q211
D-13
Q212
D-13
Q301
G-5
Q302
G-4
Q303
E-5
Q304
E-5
Q307
D-4
Q308
E-4
Q309
D-3
Q310
E-3
Q311
D-3
Q312
D-2
Q401
H-6
Q402
G-4
Q403
F-5
Q404
F-5
Q407
F-4
Q408
E-4
Q409
F-3
Q410
G-3
Q411
F-3
Q412
G-3
Q801
F-9
Q802
F-9
Q803
C-13
Q804
C-13
Q805
C-13
Q809
H-11
Q810
G-13
Q811
G-13
Q812
G-13
Q813
G-13
Q901
F-10
Q902
G-10
Q903
G-10
Q904
B-9
Q905
B-8
Q906
B-7
Q907
B-6
Q908
B-8
Q909
B-7
Q910
F-7
Q911
F-6
R141
F-13
R241
D-13
R341
D-2
R441
F-2
D801
F-8
D802
F-8
D805
F-11
D812
F-9
D813
F-9
D822
G-13
D823
G-13
D824
F-13
D825
D-13
D826
D-2
D827
G-2
D828
H-12
D829
H-12
D901
G-10
D902
G-10
D903
E-7
D904
E-7
D905
D-8
D906
D-8
D907
B-10
D908
B-10
D909
B-5
D910
B-6
D911
D-8
D912
D-8
D913
E-7
D914
E-6
D917
E-6
D918
E-6
IC801
G-7
IC806
H-8
IC807
H-8
IC808
G-6
IC813
H-5
IC814
H-5
IC815
F-8
IC901
G-11
IC902
F-10
Q101
H-9
Q102
E-9
Q103
F-11
Q104
F-10
Q107
E-11
Q108
F-11
Q109
F-12
Q110
G-12
Q111
F-13
Q112
F-13
Q201
G-8
Q202
E-8
Q203
E-11
• Semiconductor Location (MAIN SECTION)
Ref. No.
Location
Ref. No.
Location
3
3
XM-754SX
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Q102
R227
D812
C808
R851
R862
R803
J71
J37
R242
J105
C904
R245
R843
Q207
R231
R140
C233
R440
C418
R916
R922
J151
THN801
R804
R450
Q908
Q909
R918
IC901
R800
R303
R850
C937
R902
R903
R905
J157
R839
D805
R838
J158
J156
J155
J148
J145
R431
Q902
Q903
R910
R908
R907
R906
R912
D902
Q804
D901
R915
J142
Q803
Q805
R131
C816
J201
R248
R829
R130
Q108
R228
R233
Q107
R129
R133
Q104
R229
Q802
R234
Q801
Q208
J94
J160
J95
D823
D822
R909
R826
Q813
Q812
R830
R827
J146
IC801
J118
J121
C802
R810
R808
R806
R807
J154
R338
R150
J116
C817
R825
R822
R820
R823
Q811
R857
Q810
J93
J159
Q809
C805
R854
C807
D802
Q203
C812
R858
R821
R901
C133
J152
Q103
C126
R128
C434
R328
Q304
Q303
R253
Q204
C322
R153
D801
R802
R332
R330
Q307
C815
Q308
R329
R333
Q404
Q403
C326
R430
R429
Q407
Q408
R432
R334
R203
R125
C115
R852
R811
R325
R348
R911
R809
R148
THN805
THN804
THN806
J96
J107
R841
J106
R243
Q302
R353
R225
C218
C320
C118 C117
C318
R425
C317
C426
C226
R340
C334
R139
C222
R320
R405
R305
J162
R406
R853
C303
C404
C104
R206
C103
C203
C204
R205
C120
J33
R863
C217
R855
R805
D813
R134
C433
J147
R103
R856
C219
C220
R859
C333
R241
C813
R861
R223
C419
C421
R423
C319
C415
C134
R304
C420
D906
D912
R326
C422
R226
C122
R106
R402
R201
J38
C221
C417
J3
J144
R302
R122
R301
R102
R202
J202
J79
C903
C403
R105
IC806
J84
J87
J83
J32
J40
R120
IC815
R403
Q201
C913
R306
C928
J74
R101
R126
R339
D914
J2
J1
R224
R123
R221
C213
J200
R421
J46
R422
J58
J60
IC813
IC814
C814
R220
R117
C113
J44
J80
R218
R217
C119
R230
R433
C902
Q101
R124
R118
R240
R121
IC807
R222
Q202
Q402
R232
C234
C411
R317
R319
C313
R418
R324
R419
R401
R318
R321
R323
C413
R417
Q401
Q301
R322
R426
R132
R860
D913
D829
R904
Q112
Q312
Q212
R135
R144
R136
R138
R141
R336
R341
R204
C211
C311
J70
R104
J50
C215
C111
J63
J61
J65
J39
J41
J45
J59
R453
C315
J66
J52
J51
J53
R920
J62
R404
J56
J55
J54
J57
R219
J72
R801
J203
C908
C907
R427
R934
R828
C905
R337
R345
R244
R235
J129
J101
R137
R237
J97
R142
R342
R350
R335
J123
J89
J132
J133
J104
J102
J119
R145
J117
R435
J114
J115
C906
R923
C929
R932
D828
J207
J36
J68
J163
J67
J88
R331
J81
J76
J17
J75
R327
R127
J73
J136
R428
D905
R924
J85
R434
J90
R239
R914
R917
R929
R913
J127
R921
R930
R931
R933
J122
J153
R824
D824
J134
J124
J98
R236
J130
IC808
J205
J100
R238
J108
J109
D825
R250
D826
J112
J113
J128
R344
J126
R845
J131
R420
R424
C914
C901
R443
R343
R143
C304
J204
R119
D911
R439
R437
R444
THN807
Q412
R442
R441
R436
J137
R438
R445
J140
J141
D827
R448
J139
R847
C819
C818
D907
Q110
C917
C919
Q109
JW210
JW217
Q209
C923
Q310
Q309
RV304
C927
JW36
JW86
R158
C926
C123
JW203
Q211
Q111
C955
C954
RV104
Q210
C956
R358
RV204
L906
C953
C960
JW211
L909
JW214
R151
C933
C915
F901
C128
IC902
JW42
CN101
RV404
R926
R925
JW96
C911
C912
C910
C961
L908
L907
C959
CN803
JW219
JW115
Q901
JW206
L904
C922
JW78
C950
C809
JW41
C806
JW34
JW35
D909
JW73
JW52
C918
JW80
JW49
C909
D918
C925
C801
JW30
JW207
JW53
L910
JW18
CN810
CN802
R251
Q911
C924
C920
JW48
C427
R258
JW70
C958
C228
PL801
L902
JW79
JW37
C916
L903
Q905
C323
C423
JW27
Q907
RV802
Q904
Q906
RV803
Q910
CNP101
D908
JW94
JW95
C114
C212
C112
C214
JW28
C223
C227
D903
Q311
JW31
D917
D904
JW202
JW205
JW204
JW20
CN800
JW218
JW33
JW51
JW74
JW39
JW67
JW66
JW54
JW32
JW47
C327
C127
JW65
JW24
JW25
JW23
JW26
JW19
D910
C803
JW40
JW114
C804
JW38
JW76
JW75
JW220
C921
JW46
T801
C951
JW212
L905
JW216
JW208
JW60
JW215
JW213
C952
JW209
C957
R927
R928
JW29
JW221
JW45
JW201
JW11
C102
C201
C101
JW6
JW4
JW7
JW10
JW3
C931
C930
Q410
Q409
R458
JW92
C402
JW13
JW5
CNJ100
C121
C301
C202
C401
C302
JW17
JW8
JW55
JW12
JW16
JW15
Q411
JW9
JW14
JW200
JW44
JW43
JW43
CNP201
C428
CN201
C328
JW93
RV805
R351
RV806
R451
C412
C314
C312
C414
CN811
L901
2. PRINTED WIRING BOARD — MAIN SECTION — • Refer to page 2 for Semiconductor Location and Common Note on Printed Wiring Boards.
((Page 15))
((Page 15))
((Page 15))
4
4
XM-754SX
C122 C121 R126
C101
R101
R102
C102
R105
C103
R153
IC801(1/2)
C104
R106
R206
C204
R104
R103
C201
R201
C202 R202
IC801(2/2)
R253
C221
R226
R203
R204
C119
C120
C219
C220
C222
R205
C203
C117
C118
C218
C319
C320
C419
C420
C417
R326
C302
R302
C418
C318
C317
R304
R303
C322
C301 R301
R305
C303
R426
C422
C402 R402
R404
R403
R405
C403
C421
C401
R401
R453
IC808(2/2)
R406
C404
R353
IC808(1/2)
C304
R306
C901
R117
IC806(2/2)
C112
C114
C111
R119
C113
R120
R121 R122 R123
C115
IC807(2/2)
R217
C214
C215
C213
C212
R219
C211
IC807(1/2)
R220
R221 R222 R223
C902
IC813(2/2)
C907
R317
C314
IC813(1/2)
C311
R319
C312
C313
R320
R321 R322 R323
IC814(2/2)
R417
C414
IC814(1/2)
C411
R419
C413
C415
R420
R421 R422
R423
C908
R428
R427
Q402
R431
R429
R330
R332
R328
R327
C315
Q302
C323
Q304
Q303
R331
R228
R230
R227
C223
Q204
R232
Q202
Q203
R231
R229
R128
IC806(1/2)
Q102
R127
R130
R132
C123
Q104
Q103
R131
R129
R133
Q107
Q111
C127
R134
R233
Q207
Q211
C227
R235
R237
R238
R234
R329
R333
Q307
Q311
R335
R337
C327
R338
R336
R334
R433
Q407
Q403
C423
Q404
Q411
C427
R437
R434
R432
R430
Q410
R436
R438
R450
R445
R435
Q409
R448
Q412
Q310
R350
Q312
Q309
R348
R345
Q210
Q212
R236
R245
Q209
R136
Q110
R138
R137
R145
Q109
R150
R148
Q112
R135
C128
R151
C904
C903
C228
R251
C328
R351
C906
C905
C428
R451
C217
R248
R250
TP11
TP13
TP12
TP21
TP23
TP22
TP31
TP33
TP32
TP41
TP43
TP42
CNJ100
CNJ100
CNJ100
CNJ100
CN101
R125
R225
CN201
R325
CNP201
CNP101
RV802
RV802
RV805
RV805
RV806
RV806
RV803
RV803
C412
Q408
C434
Q108
Q208
Q308
C134
C234
C433
C333
C233
C133
R158
R458
R358
R258
CN810
CN811
C334
R425
R124
R224
R324
R424
C819
R118
Q101
R139
R140
C126
R142
R141
R143
R144
R244
R243
R242
R240
C226
R241
R239
R218
Q201
R341
R340
R343
R342
C326
R339
R344
R318
Q301
R418
Q401
R443
R442
C426
R440
R441
R439
R444
RV104
RV204
RV304
RV404
3. SCHEMATIC DIAGRAM — MAIN SECTION (1/2) — • Refer to page 2 for Common Note on Schematic Diagrams.
(Page 5)
((Page 14))
((Page 14))
Click on the first or last page to see other XM-754SX service manuals if exist.