CFS-B21L - Sony Audio Service Manual (repair manual). Page 6

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SECTION 3
MECHANICAL ADJUSTMENTS
SECTION 4
ELECTRICAL ADJUSTMENTS
PRECAUTION
1.
Clean the  following parts with a denatured-alcohol moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2.
Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
3.
Do not use a magnetizer screwdriver for the adjustments.
4.
After the adjustments, apply suitable locking compound to
the parts adjusted.
5.
The adjustment should be perfomed with the reted power
supply voltage unless otherwise noted.
6.
Power supply voltage: 6V dc.
Torque Measurement
Tape Tension Measurement
Torque meter
CQ-403A
Meter reading
more than 100g
(more than 3.53 oz)
Torque
Forward
Forward
back tension
Fast
Forward
Rewind
Torque meter
CQ-102C
CQ-102C
CQ-201B
CQ-201B
Meter reading
30-70g•cm
(0.42-0.97 oz•inch)
1.5-5.5g•cm
(0.020-0.076 oz•inch)
more than 60g•cm
(more than 0.83 oz•inch)
more than 60g•cm
(more than 0.83 oz•inch)
4-1.
TAPE RECODER SECTION
Standard Output Level
Test Tape
Tape Speed Adjustment
Procedure :
Mode : playback
Type
WS-48A
P-4-A063J
Used for
tape speed adjustment
head azimuth adjustment
Signal
3kHz, 0dB
6.3kHz, –10dB
Speed checker
–1% to +1%
Digital frequency counter
2,970–3,030Hz
output terminal
load impedance
output signal level
HP OUT
32
0.25V (–10dB)
SP OUT
12
0dB
tape speed adjustment
control inside motor
 — 6 —
32k
Ω
phones jack
test tape
WS-48A
(3kHz, 0dB)
speed checker
LFM-30
         or
digital frequency
counter
set
Adjustment Value :
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :

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