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SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
pinch roller
capstan
rubber belt
2.
Demagnetize the playback head with a head demagnetizer.
3.
The adjustments should be performed with the rated power
supply voltage (3.0 V) unless otherwise noted.
Torque Measurement
SECTION 4
ELECTRICAL ADJUSTMENT
PRECAUTION
• Supplied voltage : 3.0 V
• Switch position
AVLS switch : NORM
MEGA BASS switch : OFF/NORM
Test tape
Tape Speed Adjustment
Procedure :
1.
Playback WS-48A (tape center part) in the REV state and adjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
2.
Playback WS-48A (tape counter part) in the FWD state.
Check that frequency counter reading is within 1.5% of reading
of step 1.
Adjustment Location :
Digital frequency counter
2,985 to 3,015 Hz
Type
WS-48A
Signal
3 kHz, 0 dB
Used for
tape speed adjustment
Mode
Torque Meter
Meter Reading
20 – 30 g • cm
FWD
CQ-102C
(0.28 – 0.42 oz • inch)
FWD
less than 2 g • cm
back tension
(less than 0.03 oz • inch)
more than 40 g • cm
FF, REW
CQ-201B
(more than 0.56 oz • inch)
i
test tape
WS-48A
(3 kHz, 0 dB)
set
jack (J301)
16
Ω
frequency counter
RV601:
Tape speed adjustment
[MAIN BOARD]
