Sony BM-87DST Service Manual ▷ View online
– 21 –
– 22 –
BM-87DST
6-2. BLOCK DIAGRAM
Note:
• Signal path.
• Signal path.
E
: PB
a
: REC
02
R601
R647
R646
R648
2
3
4
5
6
7
8
9
A
1
B
C
D
E
F
G
[SERVO BOARD]
PM902
FWD
PLUNGER
M
M901
FWD
MOTOR
YEL
(W)
ORG
(V)
RED
(U)
BRN
(COM)
W
V
U
COM
D605
Q611
Q604
Q606
Q613
Q619
Q617
Q615
Q608
Q614
Q616
R633
R622
R624
R623
R621
R634
J612
C605
C603
C608
C601
C602
C609
C610
Q603
Q605
M902
FF/REW
MOTOR
MOTOR
M
WHT
GRY
R626
R627
R629
R630
R640
R646
R631
R635
R613
R632
R638
R605
R603
R604
R649
R619
R620
R618
R615
R645
R612
R650
R636
R625
R639
R628
R637
C615
C611
J613
C613
Q609
Q607
PH601
1
5
7
14
10
8
IC602
1
5
7
14
10
8
IC603
D604
D606
Q612
Q610
J615
J614
C614
THP602
THP601
PM901
STOP
PLUNGER
PM903
BRAKE
BRAKE
PLUNGER
BLK
BLK
WHT
RED
R641
1
5
IC604
1
5
13 15
20
24
10
12
IC601
R602
J611
Q601
Q618
D601
C
MAIN BOARD
CN108
(Page 30)
BRN
RED
ORG
YEL
WHT
BLU
B
MAIN BOARD
CN107
(Page 30)
BRN
RED
ORG
YEL
WHT
A
MAIN BOARD
CN106
(Page 30)
BRN
RED
WHT
ORG
YEL
BLU
R616
11
(11)
1-677-763-
RV602
RV601
BLK
BLK
S602
(TAB DET)
S601
(CASSETTE DET)
– 23 –
– 24 –
BM-87DST
D601
B-6
D604
G-6
D605
B-2
D606
G-6
IC601
B-4
IC602
E-6
IC603
F-3
IC604
D-4
Q601
B-6
Q602
C-2
Q603
E-3
Q604
E-3
Q605
E-3
Q606
E-3
Q607
G-4
Q608
C-2
Q609
G-4
Q610
F-6
Q611
B-2
Q612
G-5
Q613
E-5
Q614
C-3
Q615
C-3
Q616
C-3
Q617
C-2
Q618
B-6
Q619
B-6
Ref. No.
Location
z
Semiconductor
Location
6-3. PRINTED WIRING BOARDS (SERVO SECTION)
Note:
• X
: parts extracted from the component side.
• b
: Pattern of the rear side.
– 25 –
– 27 –
– 26 –
BM-87DST
6-4. SCHEMATIC DIAGRAM (SERVO SECTION)
1
M901
VOLT/DIV : 0.5 V AC
TIME/DIV : 2 msec
TIME/DIV : 2 msec
2.8Vp-p
3.8 msec
z
Waveform
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack (J103).
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark
no mark
: LISTEN
(
)
: REW
<
>
: FF
• 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.
– 28 –
– 30 –
– 29 –
BM-87DST
6-5. PRINTED WIRING BOARDS (MAIN SECTION)
D101
F-4
D102
F-3
D104
C-3
D105
D-5
D106
D-5
D107
D-7
D108
B-3
D109
C-3
D110
C-10
D111
C-10
D112
G-10
D113
D-10
D114
C-11
D115
D-10
D116
D-11
D117
D-5
D118
D-5
D119
D-5
D120
C-10
D121
F-8
LE301
A-9
LE302
A-8
LE303
A-8
IC101
G-8
IC102
H-5
IC103
H-4
IC104
F-5
IC105
E-4
IC106
E-4
IC107
F-7
Ref. No.
Location
z
Semiconductor Location
IC108
C-2
IC109
D-8
IC110
G-3
IC111
G-7
IC201
G-6
Q102
E-3
Q103
C-6
Q104
C-7
Q105
C-5
Q107
D-5
Q108
C-6
Q109
C-6
Q110
C-6
Q111
D-6
Q112
D-6
Q113
C-8
Q114
C-8
Q115
E-7
Q116
E-7
Q118
C-5
Q119
G-9
Q120
C-9
Q121
E-7
Q122
G-8
Q123
F-8
Q124
F-8
Q125
F-8
Q126
F-8
Q201
G-6
Q202
H-6
Ref. No.
Location
Note:
• X
: parts extracted from the component side.
• b
: Pattern of the rear side.
02
2
3
4
5
6
7
8
9
10
11
12
13
A
1
B
C
D
E
F
G
H
C152
C165
C132
C133
C104
CN101
IC107
C172
C127
C116
C125
C113
C214
C219
C220
C210
C212
C209
C217
Q201
C140
C147
C141
C201
Q202
C143
C148
C203
C124
C123
C171
C112
C110
C107
C105
C118
C153
C154
C157
C207
CN201
1
1
1
1
1
2
2
4
1
5
7
5
9
5
6
1
5
2
3
4
5
6
7
8
9
10
11
12
CN103
CN102
J103
J101
T101
CN105
CN108
3
R144
JP109
JP110
JP112
JP113
JP141
JP140
JP139
JP155
JP151
JP180
JP153
JP152
JP173
JP174
JP175
JP176
JP202
JP200
JP203
JP204
JP201
JP202
JP200
JP203
JP204
JP201
JP199
JP214
JP193
JP196
JP195
JP198
JP171
JP150
JP149
JP148
JP170
JP168
JP165
JP169
JP197
JP166
JP167
JP162
JP187
JP213
JP185
JP186
JP186
JP183
JP184
JP184
JP163
JP144
JP145
JP121
JP119
JP104
JP103
JP122
JP123
JP103
JP122
JP123
JP120
JP102
JP101
JP115
JP117
JP116
JP118
JP118
JP148
JP147
JP147
JP164
JP143
JP194
JP192
JP191
JP190
JP189
JP188
JP215
JP172
JP219
JP206
JP207
JP223
JP225
JP224
JP236
JP242
JP241
JP235
JP234
JP233
JP218
JP216
JP216
JP228
JP230
JP229
JP230
JP229
JP227
JP237
JP237
JP238
JP240
JP232
JP231
JP239
JP243
JP226
JP209
JP211
JP212
JP220
JP222
JP221
JP224
JP179
JP178
JP177
JP208
JP182
JP210
JP181
JP205
JP133
JP134
JP154
JP142
JP137
JP138
JP161
JP156
JP158
JP159
JP161
JP156
JP158
JP159
JP160
JP157
JP136
JP135
JP114
JP111
JP128
JP105
JP127
JP126
JP125
JP124
JP108
JP131
JP128
JP132
JP107
JP16
JP130
1
2
3
2
3
IC108
1
4
8
IC110
5
1
4
8
IC103
5
1
4
8
IC102
5
1
1
5
8
16
15
10
9
7
14
IC111
IC201
8
1
7
14
IC101
8
65
80
75
70
1
5
10
15
20
24
IC109
40
25
30
35
64
41
45
50
55
60
1
5 7
14
10
IC104
8
1
5
10
1
5
8
16
15
10
9
7
14
IC105
IC106
8
D108
D104
D109
Q105
D106
Q107 D117
D118
D105
D102
D101
ECB
ECB
ECB
ECB
Q119
ECB
Q102
Q110
ECB Q108
ECB
Q103
ECB
Q104
ECB
Q111
D119
ECB Q112
ECB ECB
Q122
ECB
ECB
ECB
Q116
ECB
ECB
ECB
Q125
Q126
Q124
ECB Q120
ECB
Q123
D121
Q115
Q118
D107
ECB
ECB
ECB
Q121
Q113
Q114
D114
Q109
D120 D110
D116
D111
D115
7
6
5
4
3
2
1
D113
LF101
DC IN 9V
TELEPHONE
PICKUP
CN201
CONTROL
UNIT
1
5
1
5 6
L-CH
R-CH
HRP901
REC/PLAYBACK
ERASE HEAD
S109
FF
M
S108
LISTEN
B
S107
STOP
x
S106
REW
m
S110
TEL
REC
S111
z
ERASE
S103
AUTO STOP
STEREO
R
ON
R
OFF
S112
POSITION NO.
(
a
:ON)
S102
SPEAKER
BUILT IN
r
HAND
S104
SPEED CONTROL
OFF
R
ON
SPEED
+
T
–
S105
TAPE SPEED
2.4
R
4.8
S101
POWER
OFF
R
ON
J102
i
SP901
SPEAKER
CN104
1
5
6
6
CN106
CN107
1
5
6
6
1
5
2
1
1
A
(Page 24)
2
B
(Page 24)
3
C
(Page 24)
SERVO BOARD
LED303
POWER
POWER
LED302
REC/ERASE
LED301
LTR INDEX
[LED BOARD]
11
(11)
1-677-762-
11
(11)
1-677-760-
[MAIN BOARD]
[12P CONNECTOR BOARD]
RV103
D112
REVERSE TIME
S112
TONE
RV101
VOLUME
RV102
9
8
7
6
5
4
3
2
1
4
2
1
2
3
4
2
3
4
0
1
a
2
a
3
a
a
4
a
5
a
a
6
a
a
7
a
a
a
8
a
9
a
a
1
3
COM
C155
C156
R160 R169
C168
C181
C180
C179
C169
C170
R190
R188
R191
R186
C174
C177
C178
C158
R161
R216
C221
C159
R196
C166
R194
R195
R181
R180
C167
R182
R179
R177
R193
R192
R159
R129
C164
R197
R133
R130
R116
R123
R114
R110
R131
R125
R109
C109
R106
C122
R115
C114
C130
R113
R108
C111
C108
C106
R107
R121
R117
R119
C119
C120
R102
R104
R105
R103
R200
R120
R118
R118
C126
C117
C121
C115
R187
R162
R172
R167
R132
R173
R171
R170
C131
R124
R219
R138
R140
C134
R142
R143
R166
R164
C160
R224
C137
C136
R141
R214
R101
R223
C139 R145
R217
C208
C218
C211
R211
R213
R199
R218
R201
C138
C101
C183
C182
C128
C151
C150
C129
C213
R198
R205
R202
R204
R212
C216
C146
C145
R135
R221
R128
R137
R158
R156
R154
R155
R157
R136
C176
R134
C149
C142
C144
R210
R209
R208
R146
R151
R122
C175
R220
R152
R150
R153
R147
R149
R148
R215
R203
C204
C205
C202
C206
C215
R207
R206
R222
R226
R225
R183
R176
R185
R184
C161
R174
R175
C163
C162
X101
C173
R165
R168
R127
R126
R189
R163
C102
C103
BCE
11
(11)
1-677-761-
C135
ECB
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