14
0 dB=0.775 VTAPE DECK SECTION
SECTION 6
ELECTRICAL ADJUSTMENTS
1. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head)
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
the parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment)
6. The adjustments should be performed for both L-CH and R-
ch.
7. Switches and controls should be set as follows unless other-
wise specified.
• Test Tape
Record/ Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
Procedure:
set
MAIN board
IC401
Pin 8 (L-CH)
Pin eg (R-CH)
MAIN board
IC401
Pin rs
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
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
• Tape Tension Measurement
• Torque Measurement
• Tape Tension Measurement
Mode Torque Meter Meter Reading
Forward CQ-102C
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Forward
CQ-102C
2 to 6 g•cm
Back Tension (0.026 – 0.082 oz•inch)
Reverse CQ-102RC
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Reverse
CQ-102RC
2 to 6 g•cm
Back Tension (0.026 – 0.082 oz•inch)
FF, REW CQ-201B
61 to 143 g•cm
(0.85 – 1.98 oz•inch)
Mode Tension Meter Meter Reading
Forward CQ-403A more than 100 g (3.52 oz)
Reverse CQ-403R more than 100 g (3.52 oz)
SECTION 5
MECHANICAL ADJUSTMENTS
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
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