Sony XM-2002GTW Service Manual ▷ View online
9
XM-2002GTW
2-4. FRONT PANEL
1
three screws
(+P 3
×
8)
2
two screws
(+P 3
×
8)
3
front panel
AMPLIFIER 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
2-5. LED ILLUM BOARD, LED PROT BOARD
10
XM-2002GTW
Bias Adjustment
Note : In Bias Adjustment, adjust RV103 if any of Q108 through
Q113 are replaced. Adjust RV203 if any of Q208 through
Q213 are replaced.
Q213 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 B+ and REM terminals from the stabi-
3. Apply the voltage to the B+ and REM terminals from the stabi-
lized power supply and gradually increase it up to 12.0 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 700 mA (total of 1.4 A).
of 700 mA (total of 1.4 A).
5. After adjustment, check that the power current is at 1.65 to 2.05 A.
Adjustment Location : Amplifier board (conductor side)
Stabilized
Power supply
B+, REM terminal
set
GND terminal
– AMPLIFIER BOARD (CONDUCTOR SIDE) –
RV103
BIAS ADJUSTMENT
(L-CH)
RV203
BIAS ADJUSTMENT
(R-CH)
11
11
XM-2002GTW
XM-2002GTW
SECTION 4
DIAGRAMS
IC901 TL594INSR
OSC
REF 5V
ERROR
ERROR
0.1V
Q1
Q2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
NON
INV
VREF
VCC
C2
E1
E2
OUT
+IN
-IN
COMPEN
CT
RT
C1
GND
TIME
• 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.
•
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.
• Waveform
1
IC901
5
1 V/DIV, 5
µ
sec/DIV
3 Vp-p
15
µ
sec
Ref. No.
Location
• Semiconductor Location
D104
F-12
D106
E-11
D107
E-10
D108
E-11
D109
E-10
D204
B-9
D206
C-9
D207
C-9
D208
D-9
D209
C-9
D701
F-9
D702
F-9
D703
F-9
D801
D-9
D802
D-9
D803
F-9
D820
F-6
D822
E-10
D827
B-13
D832
B-13
D850
F-13
D851
G-13
D852
D-13
D853
D-13
D854
G-13
D901
G-6
D902
G-6
D905
B-2
D906
C-2
D909
D-5
D910
D-5
D911
E-6
D912
E-5
D913
E-6
D914
E-6
D915
C-7
D917
E-5
D918
E-6
D919
D-7
D920
D-7
D921
I-12
D922
I-13
IC101
H-11
IC102
G-10
IC202
H-9
IC301
G-8
IC302
H-7
IC901
F-7
IC902
F-9
IC903
C-7
Q101
G-9
Q102
F-10
Q103
F-10
Q104
F-10
Q105
F-10
Q106
F-11
Q107
F-12
Q108
E-12
Q109
F-12
Q110
D-12
Q111
F-12
Q112
D-12
Q113
G-12
Q114
E-11
Q201
H-9
Q202
F-9
Q203
D-10
Q204
D-10
Q205
D-10
Q206
D-10
Q207
B-9
Q208
B-9
Q209
B-9
Q210
B-8
Q211
B-10
Q212
B-7
Q213
B-11
Q214
C-9
Q701
F-9
Q702
F-9
Q801
D-9
Q802
C-12
Q803
C-12
Q804
B-12
Q805
E-9
Q806
D-9
Q901
F-6
Q902
G-6
Q903
H-5
Q904
D-2
Q905
D-2
Q906
E-2
Q907
G-2
Q908
F-2
Q909
F-2
Q910
E-5
Q911
E-5
Q912
E-5
Q913
E-4
Q914
D-6
Q915
E-6
Q920
C-7
Ref. No.
Location
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
12
12
XM-2002GTW
XM-2002GTW
4-1. PRINTED WIRING BOARDS — MAIN SECTION — • Refer to page 11 for Semiconductor Location.
: Uses unleaded solder.
1
A
B
C
D
E
F
G
H
I
2
3
4
5
6
7
8
9
10
11
12
13
TP05
TP07
R154
C127
R130
R804
D915
C903
R807
C906
R135
IC901
C203
D207
D909
D910
D917
C913
R910
Q903
Q902
R909
D902
D901
C908
R902
R818
R903
C806
R160
Q702
R901
R905
C941
D913
D914
R936
R937
Q915
Q214
R942
R238
D204
R906
D701
R940
R811
R941
R138
R844
R821
D820
Q910
Q114
R234
D208
R140
R161
C227
D104
C940
R139
R803
R704
D702
C914
D703
D803
R808
Q203
Q204
R233
R235
R231
R805
D801
D802
R802
R800
R801
Q801
C801
Q805
Q806
R812
R809
R810
C804
C225
R232
PTH801
Q802
C803
D919
D920
Q804
Q803
R806
C224
C226
R256
R255
C927
C928
R133
Q104
Q103
R134
R236
R136
R132
C124
R131
C125
C126
R155
R156
R129
R229
Q102
Q202
C904
C905
R230
R828
D827
D206
R240
R833
D832
IC101
R204
R107
C204
R202
C230
R201
R206
R207
R203
IC301
C107
R209
C221
C231
C108
R109
R102
R101
R103
R104
R106
C103
C130
C104
R834
C222
C943
IC302
R308
C302
C301
R303
R302
R305
R306
R301
R304
R309
R310
C305
C303
R307
C304
C232
C132
R944
R943
C942
R820
D209
R904
C860
R928
R929
R931
R933
Q913
Q912
TP06
R930
R932
D922
D921
R951
C208
C207
R952
C205
C206
C105
C106
C902
C901
IC102
IC202
R108
R121
R120
R123
C116
C110
Q101
Q201
R125
C118
R124
R126
R220
R223
R225
C218
R224
R226
D106
D108
D109
D107
R239
R701
R703
R702
TH808
D822
TH803
R938
R939
R914
R916
R918
R919
R924
R915
R917
R920
R921
R927
R912
TH801
D911
D918
D912
R260
R261
R253
R153
R148
R146
R144
R143
R145
R147
R248
R246
R244
R243
R245
R247
R823
JR101
JR102
C950
R254
Q911
Q914
Q701
Q920
R208
C210
C216
R221
R211
R110
R210
R111
RV103
C918
C919
C917
Q907
Q908
Q909
Q906
C920
D905
C915
Q213
Q211
Q209
Q208
D906
Q904
C701
L903
R149
Q210
Q212
R250
R249
R251
Q905
C916
Q901
C909
R141
Q207
IC902
C907
C911
R252
C228
C932
C933
C937
C936
C935
C934
L907
IC903
R142
L902
C123
Q205
Q206
C805
C223
C802
L908
L906
RV203
Q106
Q105
L905
RV102
RV102
C101
C109
C209
C211
C202
C201
-2
-1
-2
-1
C131
C102
C111
S801
S801
C912
RV101
RV101
L904
CN803
1-869-133-
1-869-135-
1-869-134-
CN803
R241
R242
Q113
Q111
Q109
Q108
Q110
Q112
Q107
R150
R151
C217
C117
C112
C212
R105
R205
R152
C128
R911
C939
C938
L901
R860
R913
R950
JW106
JW182
JW183
JW235
JW236
JW241
JW304
JW305
JW101
JW100
JW102
C921
C924
JW103
JW107
JW108
JW109
JW110
JW104
JW105
JW111
JW116
JW113
JW114
JW115
JW112
JW161
JW159
JW160
JW158
JW157
JW165
JW166
JW167
JW164
JW163
JW162
JW169
JW168
JW171
JW170
JW120
JW121
JW122
JW117
JW118
JW123
JW119
JW129
JW127
JW128
JW130
JW131
JW132
JW133
JW138
JW139
JW140
JW141
JW143
JW142
JW205
JW202
JW203
JW204
JW206
JW207
JW208
JW209
JW234
JW233
JW232
JW231
JW230
JW229
JW228
JW227
JW226
JW224
JW223
JW225
JW218
JW214
JW216
JW217
JW210
JW211
JW212
JW213
JW215
JW201
JW198
JW194
JW200
JW199
JW144
JW146
JW145
JW147
JW148
JW149
JW150
JW156
JW197
JW196
JW195
JW308
JW193
JW191
JW190
JW189
JW178
JW176
JW177
JW179
JW180
JW181
JW306
JW307
JW184
JW185
JW186
JW188
JW187
JW151
JW152
JW153
JW175
JW154
JW155
JW262
JW263
JW268
JW269
JW271
JW265
JW266
JW270
JW264
JW267
JW261
JW260
JW253
JW252
JW259
JW258
JW255
JW254
JW256
JW257
JW251
JW274
JW273
JW272
JW276
JW277
JW275
JW279
JW278
JW285
JW282
JW281
JW284
JW283
JW286
JW280
T901
DC-DC
CONVERTER
TRANSFORMER
JW287
JW288
JW309
JW290
JW289
JW300
JW301
JW302
JW303
JW299
JW298
JW297
JW296
JW219
JW220
JW221
JW222
JW292
JW237
JW238
JW294
JW295
JW291
JW310
JW239
JW240
JW293
JW244
JW243
JW242
JW245
JW248
JW250
JW246
JW247
JW249
CNJ801
CNJ802
CN804
CN801
F901
F902
40A
40A
JW174
JW173
JW172
JW192
JW134
JW135
JW136
JW137
JW126
JW125
JW124
RV307
RV307
R853
D852
D853
D854
D850
D851
R857
CN811
CN810
R851
D850,854
(ILLUMINATION)
D852,853
(ILLUMINATION)
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