Read Sony BM-575 / BM-577 (serv.man3) Service Manual online
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.
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