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SECTION 5
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback head
pinch rollers
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback 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
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Torque
Torque meter
FWD
CQ-102C
FWD
CQ-102C
back tension
FF/REW
CQ-201B
14
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DECK SECTION
1.
2.
3.
4.
5.
6.
Meter reading
40 to 70 g • cm
(0.56 - 0.97 oz • inch)
1 to 5 g • cm
(0.01 - 0.07 oz • inch)
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
55 to 140 g • cm
(0.76 - 1.94 oz • inch)
Note: Perform this adjustments for both decks.
Procedure:
1.
2.
L-CH
peak
screw
position
SECTION 6
ELECTRICAL ADJUSTMENTS
0 dB=0.775V
Demagnetize the record/playback head with a head
demagnetizer.
Do not use a magnetized screwdriver for the adjustments.
After the adjustments, apply suitable locking compound to the
parts adjusted.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
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.)
The adjustments should be performed for both L-CH and R-
CH.
Tape
Signal
P-4-A100
10 kHz, –10 dB
WS-48B
3 kHz, 0 dB
Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
SPEAKER
terminal (JK401)
set
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 2 dB of peak.
output
within
level
2dB
R-CH
peak
L-CH
peak
Used for
Azimuth Adjustment
Tape Speed Adjustment
level meter
within 2dB
screw
R-CH
position
peak
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