11
0 dB=0.775 V
TAPE 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
IC306
Pin
r;
(L-CH)
Pin
3
(R-CH)
MAIN board
IC306
Pin
rl
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
WS-48B
3 kHz, 0 dB
Tape Speed Check
P-4-L300
315 Hz, 0 dB
Level Adjustment
Mode
Torque Meter
Meter Reading
3.53 ~ 5.98 mN•m
Forward
CQ-102C
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Forward
0.20 ~ 0.58 mN•m
Back Tension
CQ-102C
2 to 6 g•cm
(0.026 – 0.082 oz•inch)
3.53 ~ 5.98 mN•m
Reverse
CQ-102RC
36 to 61 g•cm
(0.50 – 0.84 oz•inch)
Reverse
0.20 ~ 0.58 mN•m
Back Tension
CQ-102RC
2 to 6 g•cm
(0.026 – 0.082 oz•inch)
5.99 ~ 14.02 mN•m
FF, REW
CQ-201B
61 to 143 g•cm
(0.85 – 1.98 oz•inch)
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
Tension Meter
Meter Reading
Forward
CQ-403A
more than 9.8 N
more than 100 g (3.52 oz)
Reverse
CQ-403R
more than 9.8 N
more than 100 g (3.52 oz)
SECTION 5
MECHANICAL ADJUSTMENTS
