Read Sony BM-575 / BM-577 (serv.man3) Service Manual online
1
US Model
AEP Model
SERVICE MANUAL
Ver. 1.1 2006. 10
SUPPLEMENT-2
File this supplement with the service manual.
Subject : Specification change of BM-575
Change to the specifications are made to implement for the model with the serial
No. 0100001 and later (US model) or 0101751 and later (AEP model).
Check the serial No. when servicing or inspecting the set.
Mechanical adjustments, electrical adjustments, printed wiring boards, schematic
diagram, exploded view and electrical parts list of new type are described in this
supplement-2.
No. 0100001 and later (US model) or 0101751 and later (AEP model).
Check the serial No. when servicing or inspecting the set.
Mechanical adjustments, electrical adjustments, printed wiring boards, schematic
diagram, exploded view and electrical parts list of new type are described in this
supplement-2.
BM-575/577
9-960-235-82
2
BM-575/577
1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol moistened
swab:
record/playback/erase head
record/playback/erase head
pinch roller
rubber belts
capstan idlers
2. Demagnetize the record/playback/erase head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (dc 2.5 V) unless otherwise noted.
• Switches and control should be set as follows unless otherwise
specified.
MIC SENS selector
: CONF
TAPE SPEED selector : 2.4 cm
FAST PB switch
FAST PB switch
: OFF
VOR switch
: OFF
VOL control
: mechanical center
Torque Measurement
Mode
Torque meter
Meter reading
(Cassette type)
LISTEN
CQ-103M
5 to 12 g•cm
(0.069 to 0.167 oz•inch)
FF/CUE
CQ-201M
more than 5 g•cm
(more than 0.069 oz•inch)
B. SPACE
CQ-201M
more than 14 g•cm
(more than 0.194 oz•inch)
Tape Tension Measurement
Mode
Tension meter
Meter reading
(Cassette type)
LISTEN
CQ-403M
25 to 55 g
(0.88 to 1.94 oz)
Timing Adjustment
1. Take-up reel spindle should rotate at the same time as pinch
roller or earlier than pinch roller in STOP to LISTEN/DICT
mode.
Confirm that the pinch roller presses to capstan and they rotate.
mode.
Confirm that the pinch roller presses to capstan and they rotate.
2. When they are not correctly rotate, adjust the place of adjustment
plate so that it is wide.
2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Demagnetize the record/playback/erase head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
4. The adjustments should be performed with the rated power
supply voltage (dc 2.5 V) unless otherwise noted.
5. The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
should be completed before performing recording circuit
adjustment.)
• Switches and control should be set as follows unless otherwise
specified.
MIC SENS selector
: CONF
TAPE SPEED selector : 2.4 cm
FAST PB switch
FAST PB switch
: OFF
VOR switch
: OFF
VOL control
: mechanical center
Test Tape
Type
Signal
Used for
WS-24
3 kHz, –10 dB
Tape Speed (2.4 cm) Adjustment
WS-12
3 kHz, –10 dB
Tape Speed (1.2 cm) Adjustment
S-2-A030A 3 kHz, –20 dB
Head Azimuth Adjustment
Tape Speed (2.4 cm) Adjustment
Setting:
TAPE SPEED selector: 2.4 cm
Procedure:
1. Mode: LISTEN
1. Mode: LISTEN
FWD idler
adjustment plate
screw fixing the
adjustment plate
adjustment plate
0.3 to 0.6mm
2. Adjust VR102 so that the frequency counter reads 2,990 to 3,010
Hz.
Adjustment Location: See page 3.
Tape Speed (1.2 cm) Adjustment
Setting:
TAPE SPEED selector: 1.2 cm
Procedure:
1. Mode: LISTEN
1. Mode: LISTEN
2. Adjust VR103 so that the frequency counter reads 2,990 to 3,010
Hz.
Adjustment Location: See page 3.
set
test tape
WS-24
(3 kHz,
WS-24
(3 kHz,
−
10 dB)
frequency counter
EAR jack
set
test tape
WS-12
(3 kHz,
WS-12
(3 kHz,
−
10 dB)
frequency counter
EAR jack
BM-575/577
3
3
BM-575/577
Adjustment Location:
Record Bias Adjustment
Setting:
TAPE SPEED selector: 2.4 cm
Procedure:
1. Mode: DICT (record)
1. Mode: DICT (record)
Record/playback Head Azimuth Adjustment
Procedure:
1. Mode: LISTEN
1. Mode: LISTEN
2. Turn the adjustment screw for maximum digital voltmeter
reading.
Note:
Several peaks may apper, but take the maximum.
Adjustment Location:
blind plate
VR103
(1.2cm)
(1.2cm)
VR102
(2.4cm)
(2.4cm)
TAPE SPEED
ADJ
set
10 k
Ω
test tape
S-2-A030A
(3 kHz,
S-2-A030A
(3 kHz,
−
20 dB)
digital
voltmeter
voltmeter
EAR jack
adjustment hold
ornament
ornament
adjustment screw
2. Mode: LISTEN (playback)
3. LISTEN (playback) the signal recorded in step 1.
4. Turn the VOL control so that the digital voltmeter reads within
4. Turn the VOL control so that the digital voltmeter reads within
0 dB.
Confirm that the distortion meter reads within adjustment limits.
Confirm that the distortion meter reads within adjustment limits.
5. Set the TAPE SPEED selector to 1.2 cm and repeat steps 1 to 4.
6. If the adjustment limits are not satisfied, soldering the tap as
6. If the adjustment limits are not satisfied, soldering the tap as
follows.
Adjustment limits:
tape speed
distortion
2.4 cm/s
within 10%
1.2 cm/s
within 14%
Soldering Point: main board (conductor side)
set
300
Ω
6
Ω
600
Ω
AF OSC
attenuator
MIC jack
1 kHz, 0.775 mV (
1 kHz, 0.775 mV (
−
60 dB)
blank tape
CS-50-4
CS-50-4
set
10 k
Ω
recorded
portion
portion
digital
voltmeter
voltmeter
distortion
meter
meter
EAR jack
R176
R136
R132
R142
Q110
C136
C137
R141
C140
R145
R177
C139
R129
C125
R158
TP
If the adjustment limits
are not satisfied, soldering
the tap.
are not satisfied, soldering
the tap.
1.2cm
2.4cm
R123
R118
R173
B
A
TAPE SPEED
R152
IC103
1
4
8
5
IC104
1
-1
-2
4
8
5
IC101
1
4
8
5
R147
R148
R138
R139
R137
R143
B C E
B C E
Q104
S7
(POWER)
Q116
D103
Q120
B C E
B C E
E C B
E C B
E C B
B C E
S3
S3
Q114
Q105
Q121
YEL
WHT
E C B
Q111
D104
Q117
Q118
B C E
B C E
B C E
Q119
R128
R131
R144
R146
C113
C135
R126
C119
C141
C121
C118
C156
R159
R175
C138
C132
C122
C146
C158
3. DIAGRAMS
• NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in
• All capacitors are in
µ
F 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.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 3 V and fed with regulated dc
power supply from external power voltage jack.
• Voltage is dc with respect to ground under no-signal
conditions.
no mark : LISTEN (2.4 cm)
FS
no mark : LISTEN (2.4 cm)
FS
: FF/CUE: ON
BS
: B.SPACE: ON
REC
: DICT
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
E
: PB (LISTEN)
a
: REC (DICT)
for printed wiring boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.
BM-575/577
4
4
BM-575/577
3-1. PRINTED WIRING BOARDS
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
14
MAIN BOARD (COMPONENT SIDE)
1-657-824-
(13)
13
VR101
VOL
T101
S6
FF/
CUE
BLU
BLU
RED
RED
WHT
BLK
RED
RED
C1
DC IN 3V
!
J1
1-657-826-
(13)
12
LED BOARD
1-657-825-
(13)
12
D5
DC-JACK BOARD
DRY BATTERY
SIZE "AAA"
(IEC DESIGNATION R03)
2PCS,3V
or
RECHARGEABLE
BATTERY
BP-43
1-657-824-
(13)
13
R134
R140
THP101
R176
THP102
R133
R136
R132
R142
Q110
C136
C137
R141
C140
R145
R177
C139
R129
R172
S9
C125
R158
TP
1.2cm
2.4cm
R123
R103
ERASE
REC/PB
HD1
R119
C144
2
S5
1
3
4
R118
R173
B
A
B
A
R150
R178
Q124
R160
C149
R157
PH101
C155
C120
D101
D102
R149
R108
R102
C103
R101
S1
S2
S2
MIC
SENS
J2
J2,3
EAR
J3
MIC
(PLUG IN POWER)
VOR
TAPE SPEED
DICT/BATT
SP1
MIC1
C130
C160
L102
R135
Q106
C154
R115
R116
C108
C112
R113
C143
R114
C110
C109
R112
Q103
R122
D108
R155
R152
C111
IC102
1
4
8
5
IC103
1
4
8
5
IC104
1
-1
-2
4
8
5
IC101
1
4
8
5
C131
C123
C128
C127
C126
R117
R147
R148
R138
R139
R137
C134
R143
B C E
B C E
Q104
Q122
Q123
S7
(POWER)
Q116
S4
S4
FAST PB
B.SPACE
OFF
ON
OFF
ON
DICT
CONF
LISTEN
DICT
E C B
Q115
E C B
Q113
Q107
D103
B C E
Q120
B C E
B C E
B C E
B C E
B C E
E C B
E C B
E C B
B C E
E C B
Q108
E C B
Q109
S3
S3
Q114
Q105
Q121
YEL
YEL
WHT
WHT
Q112
E C B
Q111
VR102
VR103
D104
Q102
Q117
Q118
B C E
B C E
B C E
Q101
B C E
B C E
B C E
B C E
Q119
R128
R127
R130
R131
R144
R146
R125
R124
C124
C117
R110
R109
R111
C113
C135
R126
C114
R104
C105
C106
R107
C104
R106
C107
R163
R121
R120
L101
C102
R105
C101
RED
BLU
R153
R174
C145
R154
R151
JP101
C119
C141
C159
C116
C142
C121
C118
C148
C156
R159
R175
C129
C138
C132
C133
C122
C146
C158
C147
C115
C157
MAIN BOARD (CONDUCTOR SIDE)
M1
-2
-1
RED+
BLU–
WHT–
BLU
BLU
YEL
YEL
YEL+
-3
-4
MOTOR
MICROPHONE
SPEAKER
REC/PB/ERASE HEAD
(REC/PB)
D5
H-14
D101
G-10
D102
G-10
D103
G-7
D104
G-6
D108
H-10
IC101
G-9
IC102
F-6
IC103
I-6
IC104
G-8
PH101
H-11
Q101
F-9
Q102
F-9
Q103
H-11
Q104
G-9
Q105
H-9
Q106
G-12
Q107
F-7
Q108
F-5
Q109
F-5
Q110
G-6
Q111
G-6
Q112
G-5
Q113
F-7
Q114
H-7
Q115
F-6
Q116
H-6
Q117
G-7
Q118
H-6
Q119
H-6
Q120
H-7
Q121
H-9
Q122
G-10
Q123
G-10
Q124
H-10
• Semiconductor
Location
Ref. No.
Location
