21
CX-JN331/JPK331
SECTION 5
MECHANICAL ADJUSTMENTS
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 de-
magnetizer.
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
Mode
FWD
FWD
back tension
REV
REV
back tension
FF/REW
FWD tension
REV tension
Torque meter
FCQ-102C
CQ-102C
CQ-102RC
CQ-102RC
CQ-201B
CQ-403A
CQ-403R
Meter reading
3.06 N
•
m to 6.96 N
•
m
31 to 71 g
•
cm
(0.43 – 0.98 oz
•
inch)
0.19 N
•
m to 0.58 N
•
m
2 to 6 g
•
cm
(0.02 – 0.08 oz
•
inch)
3.06 N
•
m to 6.96 N
•
m
31 to 71 g
•
cm
(0.43 – 0.98 oz
•
inch)
0.19 N
•
m to 0.58 N
•
m
2 to 6 g
•
cm
(0.02 – 0.08 oz
•
inch)
6.96 N
•
m to 14.02 N
•
m
71 to 143 g
•
cm
(0.98 – 1.99 oz
•
inch)
9.80 N
•
m
100 g or more
(3.53 oz or more)
9.80 N
•
m
100 g or more
(3.53 oz or more)
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION
0 dB = 0.775 V
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to
the parts adjust.
•
Test Tape
Tape
Signal
Used for
P-4-A100
10 kHz,
−
10 dB
Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH ADJUST-
MENT
DECK A DECK B
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
2. 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 1dB of peak.
set
MAIN board
CN309
Pin
5
(L-CH)
Pin
3
(R-CH)
MAIN board
CN309
Pin
4
(HP-GND)
+
–
level meter
test tape
P-4-A100
(10 kHz,
−
10 dB)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
