Read Sony BM-87DST Service Manual online
– 18 –
PRECAUTION
1. Switches and controls should be to set to the positions as fol-
lows unless otherwise specified.
• Switch positions
POWER switch
: ON
AUTO STOP switch
: ON
SPEAKER switch
: BULT-IN
TONE control
: max (H)
VOLUME control
: mechanical mid
SPEED CONTROL switch
: OFF
REVERSE TIME control
: 0
2. Standard Input Level :
TELEPHONE PICKUP jack : 300
Ω
0.77 mV (-60 dB)
3. Standard Output Level :
Speaker
: 8
Ω
0.775 V (0 dB)
SECTION 5
ELECTRICAL ADJUSTMENTS
Record / playback / erase Head Azimuth Adjustment
Procedure :
1. Mode : Playback (LISTEN)
1. Mode : Playback (LISTEN)
earphone jack
10k
Ω
level meter
test tape
P-4-A063
(6.3kHz, –10dB)
P-4-A063
(6.3kHz, –10dB)
2. Turn the adjustment screw to obtain the maximum reading on
level meter.
Adjustment should be finished with the screw in tightening di-
rection.
Adjustment should be finished with the screw in tightening di-
rection.
3. After the adjustment, lock the adjustment screw with suitable
locking compound.
Adjustment Location : record / playback / erase head
Tape Speed Adjustment
Setup :
Mode : Playback (LISTEN)
test tape
WS-48
(3kHz, 0dB)
tape end portion
WS-48
(3kHz, 0dB)
tape end portion
frequency counter
earphone jack
Procedure :
SPEED CONTROL switch : OFF
1. TAPE SPEED switch : 4.8cm/s
1. TAPE SPEED switch : 4.8cm/s
Adjust RV602 to obtain a 3,010Hz frequency reading.
Standard value : 3,000 - 3,020Hz
Standard value : 3,000 - 3,020Hz
2. TAPE SPEED switch : 2.4cm/s
Adjust RV601 to obtain a 1,505Hz frequency reading.
Standard value : 1,500 - 1,510Hz
Standard value : 1,500 - 1,510Hz
Adjustment Location : servo board
mechanism deck
servo board
RV602
: Tape speed Adjustment (4.8cm/s)
: Tape speed Adjustment (4.8cm/s)
RV601
: Tape speed Adjustment (2.4cm/s)
: Tape speed Adjustment (2.4cm/s)
adjustment screw
head
(rec / PB / erase)
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