11
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback head
capstan
idlers
playback head
pinch roller
erase head
rubber belts
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
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 DECK A DECK B
Mode
Torque meter
Meter reading
TAPE SECTION 0 dB = 0.775 V
Standard Output Level
Output terminal
SP OUT
PHONES OUT
load impedance
6
Ω
32
Ω
output signal level
0.775 V (0 dB)
0.25 V (–10 dB)
Test Tape
Tape
Signal
Used for
WS-48B
3 kHz, 0 dB
tape speed adjustment
P-4-A063
6.3 kHz, –10 dB
head azimuth adjustment
REC/PB Head Azimuth Adjustment DECK A DECK B
Procedure:
1. Mode: playback
2. Turn the adjustment screw for the maximum output levels. If
these levels do not match. Turn the adjustment screw until both
of output levels match together within 1 dB.
J901 (phones)
set
32
Ω
test tape
P-4-A063
(6.3 kHz, –10 dB)
level meter
R-CH
peak
R-CH
peak
L-CH
peak
L-CH
peak
screw
position
Output
level
within
1 dB
within
1 dB
angle
Forward
Forward
back tension
Fast Forward
and Rewind
CQ-102C
CQ-102C
CQ-201B
2.21– 5.39 mN • m
(22.5 to 55 g • cm)
(0.31 to 0.76 oz • inch)
0.20 – 0.49 mN • m
(2 to 5 g • cm)
(0.03 to 0.07 oz • inch)
5.88 – 11.77 mN • m
(60 to 120 g • cm)
(0.83 to 1.67 oz • inch)
Tape Tension Measurement DECK A DECK B
Mode
Tension meter
Meter reading
Forward
CQ-403A
more than 150 g
(more than 5.29 oz)
