Sony XM-1252GTR Service Manual ▷ View online
9
XM-1252GTR
2-4. FRONT PANEL
2-5. LED ILLUM BOARD, LED PROT BOARD
1
two screws
(+BTP 3
×
8)
2
two screws
(+BTP 3
×
8)
3
front panel
AMP board
1
screw
(+BTP 2.6
×
5)
3
screw
(+BTP 2.6
×
5)
2
LED ILLUM board
4
LED PROT board
top cover
ornamental ring
10
XM-1252GTR
Bias Adjustment
Note : In Bias Adjustment, adjust RV103 if any of Q108 through
Q111 are replaced. Adjust RV203 if any of Q208 through
Q211 are replaced.
Q211 are replaced.
Condition : This adjustment should be performed about one minute
after the remote mode is turned on at a room tempera-
ture of about 25°C.
ture of about 25°C.
Setting :
SECTION 3
ELECTRICAL ADJUSTMENT
Procedure :
1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)
1. Turn the variable resistors RV103 (L-CH) and RV203 (R-CH)
full clockwise as seen from the component side to minimize the
bias current.
bias current.
2. The input signal is to be no signal.
3. Apply the voltage to the +12V and REM terminals from the sta-
3. Apply the voltage to the +12V and REM terminals from the sta-
bilized power supply and gradually increase it up to 14.4 V while
checking for any unusual current.
checking for any unusual current.
4. Adjust each of RV103 (L-CH) and RV203 (R-CH) so that the
power current of the stabilized power supply is increased in steps
of 550 mA.
of 550 mA.
Adjustment Location : AMP board (component side)
Stabilized
Power supply
+12V, REM terminal
set
GND terminal
RV103
BIAS ADJUSTMENT
(L-CH)
– AMP BOARD (COMPONENT SIDE) –
RV203
BIAS ADJUSTMENT
(R-CH)
11
11
XM-1252GTR
XM-1252GTR
IC901 TL594INSR
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OSC
REF. REG.
ERROR
ERROR
0.1V
• IC Block Diagram
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. (p: pF)
Note:
• All capacitors are in µF unless otherwise noted. (p: pF)
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.
•
C
: panel designation.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from +12V and REM terminals.
• Voltage and waveform are 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:
Note:
• X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
SECTION 4
DIAGRAMS
• Waveform
1 V/DIV, 5
µ
sec/DIV
1
IC901
5
1.8 Vp-p
20
µ
sec
• Semiconductor Location (AMP BOARD)
Ref. No.
Location
Ref. No.
Location
D1
D-13
D2
D-13
D3
D-13
D5
E-11
D6
E-11
D104
E-8
D106
E-9
D107
E-9
D108
E-9
D109
E-9
D204
C-7
D206
C-6
D207
C-6
D208
C-7
D209
C-7
D301
H-7
D302
H-7
D303
G-8
D304
G-8
D701
F-6
D702
F-6
D703
F-6
D801
C-6
D802
C-6
D803
F-5
D820
F-4
D822
B-9
D827
B-9
D832
B-9
D901
H-5
D902
H-4
D905
D-2
D906
D-2
D909
D-5
D910
D-5
D911
E-5
D912
E-4
D913
E-5
D914
E-5
D917
E-5
D918
E-4
D919
D-6
D920
D-6
D921
H-10
D922
H-10
IC101
G-9
IC102
H-9
IC301
H-7
IC302
H-8
IC303
G-8
IC901
G-5
IC902
H-5
Q101
H-7
Q102
E-8
Q103
E-8
Q104
E-8
Q105
E-7
Q106
E-8
Q107
E-9
Q108
D-9
Q109
E-9
Q110
D-9
Q111
F-9
Q114
F-8
Q201
G-8
Q202
E-7
Q203
D-7
Q204
D-8
Q205
C-7
Q206
C-8
Q207
B-7
Q208
B-6
Q209
B-7
Q210
B-6
Q211
B-8
Q214
C-6
Q701
F-6
Q702
F-6
Q801
C-6
Q802
C-8
Q803
B-9
Q804
B-8
Q805
G-6
Q806
G-5
Q901
H-5
Q902
H-5
Q903
H-5
Q904
E-2
Q906
F-2
Q907
G-2
Q909
G-2
Q910
F-5
Q911
F-5
Q912
E-5
Q913
F-5
Q914
D-6
Q915
E-6
12
12
XM-1252GTR
XM-1252GTR
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
1-869-137-
1-869-139-
1-869-138-
G
D
S
G D
S
G D
S
G
D
S
S D G
S D G
S D G
S D G
S D G
S D G
S D G
S D G
R844
R
120
R
220
TH801
TH8
08
TH803
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
TP12
TP13
TP14
TP15
TP16
TP17
TP18
TP19
TP20
TP21
TP22
TP24
TP25
TP26
TP27
TP28
TP29
TP30
TP31
TP32
TP33
TP34
TP35
TP36
TP37
TP38
TP39
TP40
TP41
TP
42
TP
43
TP44
TP4
5
TP46
TP47
TP48
TP49
TP50
TP51
TP52
TP53
T901
TP54
TP55
TP56
TP57
R808
R
807
R823
R
828
R833
D
827
D
832
D822
R701
R
704
R
703
Q702
D701
R
702
Q701
R
834
R
80
6
R229
R
129
R130
R
230 Q202
C942
R943
C804
R
210
R811
D803
R
812
R
809
Q806
Q805
D820
R820
P
TH8
01
R802
R
800
R801
C801
Q801
D
801
D
802
Q114
R
160
JR1
R
804
R
140
R
139
D107
D109
D1
06
D
10
8
R138
D
104
C12
7
R146
W
H
T
G
R
Y
G
RY
R144
R
143
R
145
IC102
IC301
IC303
IC302
IC101
R253
R133
R
134
R131
R
155
R156
C126
C
13
2
D204
D208
D206
D207 D209
R
238
C227
R240
R239
R245 R243
R246
R244
Q104
Q103
Q102
R132
R13
6
C124
R1
35
C927
D919
D920
R
161
C941
C940
R
937
D
914
D
913
R936
Q914
Q911
Q214
D909
D910
D912
D911
R906
D
702
R
905
C806
R
810
R
904
D
917
D918
R901
C908
R
902
R
233
R
903
R909
D
902
D
901
R818
R261
Q903
R
260
R821
R
915
R914
R
920
R
921
R
918
R919
R
917
R
916
R
924
R
927
Q910
Q913
Q912
R928
R
930
R933
R
931
R
944
C943
C914
Q902
C913
R
910
IC901
D
703
R
221
Q204
Q203
R234
R2
32
R
256
R805
C224
R
231
Q802
C8
03
Q804
Q803
R803
C
232
C225
C22
6
R255
R236
R235
R
154
C
207
C2
08
C
105
C2
06
C2
05
C106
C
108
C107
C928
C
125
C931
R
940
R222
C222
C
231
C2
21
R
25
4
R110
R112
R212
R
111
R
225
C
218
R
224
R
226
Q201
R
223
C216
R122
JR5
R
121
R109
C902
C901
C
116
R209
R
305
R
306
R
301
R302
R
123
C
308
C203
C310
C303
C304
R304
R
303
R308
R
307
C11
0
C21
0
R208
R
108
R
124
R211
C104
C
130
C1
03
R
106
R
104
R103
R
10
1
R
102
Q101
C118
D
922
D
921
R
203
R
20
7
R
206
R
20
1
R
93
2
R
929
Q915
C23
0
R
2
02
C2
04
R
107
R204
R126
R
125
R
153
C860
D
301
D302
D
304
D303
TP60
TP61
TP62
TP63
TP65
Q
907
Q
909
Q
904
Q
906
CNJ801
S802
S802
OFF
HP
LP
-1
-2
-1
-2
-1
-2
-2
-1
JW
90
JW
76
JW
71
JW51
JW
96
JW11
JW16
JW15
JW23
JW17
JW24
JW22
C802
JW
98
JW53
JW
49
JW12
JW52
JW
72
JW
92
JW
74
JW
75
JW
146
C805
C
701
JW
139
JW165
JW148
JW153
JW
138
JW149
C911
JW
145
JW
42
JW
44
JW54
JW43
RV103
JW50
JW
230
JW59
JW1
JW47
JW48
JW45
JW
84
C123
Q105
Q106
JW
95
JW
100
JW
157
JW
156
IC
902
JW
66
JW61
JW58
JW60
C939
C934
C938
C935
JW
97
C937
C936
C932
JW
81
JW
82
JW
99
JW
77
JW
79
JW
78
JW
80
JW
101
JW
39
JW
33
JW
34
JW18
JW
36
JW
35
JW13
JW7
JW14
JW8
JW6
JW5
R
V2
03
JW9
JW4
JW56
R
252
C912
C907
JW151
JW
152
JW57
JW10
JW3
JW2
C909
C916
Q901
C915
Q207
L907
L905
L902
R
150
Q211
Q210
Q208
Q1
10
Q108
Q1
11
Q
109
Q107
R
149
R250
R249
JW
40
JW114
JW
222
L901
C918
C
917
D905
D
906
JW221
RV102
JW
112
Q206
Q205
C223
C228
C
131
JW19
JW130
C302
JW117
JW225
JW111
JW
113
JW
133
C217
JW
93
JW
144
JW233
JW115
JW108
JW107
JW131
C113
C213
JW124
JW123
JW120
JW121
JW122
JW132
C306
C212
C112
C117
JW116
C301
C111
JW
227
BB1
JW119
C211
JW105
JW118
JW106
JW109
JW110
JW103
JW177
JW104
C209
C109
C202 C201
C102
C101
C128
JW232
JW
184
JW147
JW164
JW161
JW166
JW
171
JW
170
JW
169
JW
163
JW
162
JW
167
JW
231
JW
143
JW
10
2
JW176
JW158
R152
JW
223
JW159
JW
69
JW
73
JW
41
JW55
JW
62
JW
63
JW
64
JW
136
JW
135
JW
134
JW
174
JW
172
JW
173
JW
168
JW
91
JW
140
JW
141
JW
137
JW
89
JW
88
JW
87
JW
86
JW190
JW192
JW
224
JW226
JW
194
JW
208
JW
211
JW
210
JW215
JW216
JW214
JW213
JW212
JW
204
JW
205
JW
206
JW
207
JW202
JW201
JW198
JW197
JW196
JW195
JW
203
JW219
JW218
JW217
JW199
JW
180
JW
188
JW
187
JW
186
JW
193
JW183
JW181
JW
182
JW
83
RV101
JW
228
JW46
JW220
JW175
CN810
CN810
JW
68
JW
94
C924
C921
JW
155
JW
32
JW
31
C919
C920
JW
240
JW
154
JW
241
JW242
JW
243
JW244
JW
2
45
JW
246
JW247
C933
L904
(BTL)
SPEAKER OUT
INPUT
FILTER(80Hz)
RV101
LEVEL
RV102
LOW BOOST
(40Hz)
CN803
HIGH LEVEL
SENSING POWER ON
CN802
R
-2
R
R
L
-3
-1
-4
-2
-1
L(BTL)
L
F902
30A
REM
GND
+12V
CN801
F901
30A
Q209
JW
29
JW
30
JW
37
JW
38
JW
142
C307
R241
R242
R141
R142
R911
R913
R907
R860
R
205
R105
D5
PROTECTOR
D3
D1, 2
(ILLUMINATION)
D5, 6
(ILLUMINATION)
D6
R3
D3
CN852
D1
D2
R2
R1
GRY
GRY
WHT
GRY
WHT
WHT
GRY
4-1. PRINTED WIRING BOARDS • Refer to page 11 for Semiconductor Location.
: Uses unleaded solder.
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