Read Sony XM-255EX / XM-255NX Service Manual online
8
XM-255EX/255NX
8
• IC BLOCK DIAGRAM
IC901 TL494CN
4
1
2
3
5
6
7 8
9
10
16 15
14
13
12 11
ERROR
0.1V
REG.
REF.
OSC
ERROR
3-2. PRINTED WIRING BOARDS
• Semiconductor
Location
D301
F-4
D302
G-4
D401
D-4
D402
E-4
D501
B-2
D903
C-5
D904
D-7
D908
A-3
D909
B-3
D912
C-5
IC101
F-3
IC201
D-3
IC301
D-2
IC401
B-2
IC901
C-6
Q301
F-4
Q302
G-4
Q303
F-4
Q304
F-5
Q305
G-5
Q306
G-5
Q307
G-5
Q308
G-5
Q309
G-5
Q310
F-6
Q311
G-6
Q312
G-6
Q401
D-4
Q402
E-4
Q403
D-4
Q404
D-5
Q405
E-5
Q406
E-5
Q407
E-5
Q408
D-5
Q409
E-5
Q410
D-6
Q411
E-6
Q412
E-6
Q901
C-7
Q902
C-7
Q903
C-7
Q904
D-7
Q905
D-7
Q906
D-7
Q907
D-7
Q908
D-7
Q941
C-5
Q942
C-4
Q943
A-2
Q944
A-2
Q946
B-5
Q947
A-6
Q948
B-6
Q949
B-5
Q963
C-4
Q964
D-4
Q965
C-4
Ref. No.
Location
• WAVEFORMS
1
2
3
4
12.8Vp-p
31
µ
sec
12Vp-p
31
µ
sec
28Vp-p
31
µ
sec
56Vp-p
31
µ
sec
SW501
TEST
TONE
SW101
FILTER
OFF
LPF
VR101
FILTER
FILTER
VR102
LEVEL
(THROUGH)
Q411
Q310
Q311
CN201
SPEAKER OUT
REMOTE
+12V
GND
L
L+R MONO
R
CNJ301
HIGH LEVEL
INPUT
R
OUTPUT
L
L
R
L
R
L
R
L
R
(MONO)
INPUT
IC301
IC901
9
8
16
1
IC201
IC401
IC101
ZD910
ZD911
D501
Q946
T901
Q949
ZD913
Q942
Q941
D912
D903
Q964
Q965
Q963
Q401
D401
Q403
Q402
D402
Q407
Q412
Q906
Q904
Q903
Q902
ZD901
ZD902
D904
Q908
Q905
Q907
Q312
Q303
D301
Q307
Q302
D302
Q944
Q943
E
E
8
5
4
1
8
5
4
1
SW101
CNJ101
E
E
E
1
E
E
E
E
E
E
E
E
E
E
S
S
E
Q901
CN901
V+
GND
THR
CUR
OFF
CN901
F901
PL901
Q301
Q304
Q305
D908
D909
Q308
Q309
E
E
E
E
E
E
Q306
Q406
Q409
Q405
Q408
Q404
Q948
Q947
E
E
E
E
E
E
E
SW501
8
5
4
1
8
5
4
1
-1
-2
VR101
-1
-2
VR102
E
E
E
E
E
E
E
E
E
E
E
E
E
-3
-4
R512
R506
R510
C504
C503
R511
R508
R509
C501
R503
R501
R503
R501
R502
R505
R505
R507
R504
C502
J195
R115
R215
R216
R116
R117
R217
R217
J196
J193
J193
C118
C218
R191
R212
J194
R112
R113
R213
C200
R957
C937
C934
R958
J192
J190
J995
C100
C116
C117
C217
R201
R202
C221
C222
R101
R102
R104
C203
R205
C207
R206
C206
C505
R105
R203
R204
R103
C107
R107
C106
J197
R514
C204
R106
C103
C104
R210
R110
C947
C933
R948
R947
R949
R941
R943
R944
TH902
R953
R954
R952
C962
R962
R955
R961
R965
R963
C931
R960
R964
R907
R915
R913
R918
J994
R959
R916
R917
R917
J991
R401
R405
R406
R413
R410
R404
R403
R407
R411
R412
J491
R402
R416
R415
R419
R414
R422
R421
R424
R418
R909
R910
R911
R912
R919
R921
R920
J922
R923
R922
C912
R926
C913
R925
R924
R940
R938
R939
R930
C902
R902
R901
R903
C903
R904
R905
R906
R423
R323
R324
R321
R322
R315
R314
R316
R318
R305
R306
R313
R310
R304
R303
R307
R311
R312
R302
R956
R301
R319
R945
R946
C402
C216
R914
C908
C302
C210
C943
C941
C944
L901
J934 J933
J917
J931 C906
C904
J924
J925
J923
J922
J921
C401
C403
J410
J935
C901
J944
J943
J945
J940
J941
J939
J938
J937
C910
C907
J936
C909
J951
C408
J431
J331
J952
R420
TH901
R426 R425
R326 R325
C308
R320
J311
J314
R317
C304
R309
R308
C303
J313
J427
J321
J323
J322
J423
J421
J422
J315
C301
J111
J103
J112
J113
J115 J114
C209
J107
J108
C105
J109
J110
R139
R239
J101
J102
C102
J105
J104
J106
C201
C101
C202
J118
C212
R111
J117
J119
C936
R211
J120
J327
C112
C211
C110
C213
C111
J122
J121
J123
J126
C214
C113
C114
J511
J513
J510
C951
C950
C949
J911
J913
J512
C945
C946
R951
R950
J912
C952
C953
C948
J914
J928
J915
J916
C961
J920
C930
J918
J919
C905
J932
R409
R408
J411
J412
R417
C404
J420
J329
J328
J325
J326
J429
J428
J425
J426
J312
J415
PH901
F901
20A
Q410
8
7
A
B
09
6
5
4
3
2
C
E
D
G
F
1
MAIN BOARD
11
1-677-608-
09
2
B
A
1
1-677-341- 11
R934
R928
R927
R931
R929
R933
R932
R980
R937
R936
R935
R942
Q911
Q913
Q914
Q910
Q909
D906
D907
D905
PN901
Q915
LED BOARD
E
E
E
E
E
E
V+
GND
THR
CUR
OFF
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