— 6 —
SECTION 3
ADJUSTMENTS
3-1.
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured-alcohol-moistend
swab :
playback head
pinch roller
capstan
rubber belts
2. Demagnetize the 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 perfomed with the rated power supply
voltage (2.5V) unless otherwise noted.
Torque Measurement
3-2.
ELECTRICAL ADJUSTMENTS
Precaution
•
Supplied voltage : 2.5V
•
Switch and control position
TAPE switch : NORM
VOLUME control : maximum
AVLS switch : OFF
Mode
Torque meter
Meter reading
FWD
FWD
Back Tension
FF, REW
CQ-102C
CQ-201B
20 to 42 g•cm
(0.28 to 0.58 oz•inch)
less than 2 g•cm
(less than 0.03 oz•inch)
more than 60 g•cm
(more than 0.83 oz•inch)
TAPE SECTION
•
FUNCTION switch : TAPE
Test tape
Type
Signal
Used for
WS-48A
3kHz, 0dB
Tape Speed Adjustment
Tape speed adjustment
Tape selection adjustment : NORM
Procedure :
Adjustment Value: normal tape speed
Adjust the tape speed adjustment RV601, so that the freqency counter
reading becomes 3,000Hz.
Specification Value:
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
0dB=0.775V
Digital frequency counter
2,945 to 3,015Hz
set
16
Ω
J302(phones)
frequency
counter
test tape
WS-48A
(3kHz, 0dB)
