— 8 —
SECTION 4
MECHANICAL ADJUSTMENT
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1.
Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
pinch roller
rubber belts
capstan
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.
Torque Measurement
Mode
FWD
FWD
Back Tension
FF, REW
Torque Meter
CQ-102C
CQ-102C
CQ-201B
Meter Reading
20 to 42 g•cm
(0.27 to 0.58 oz•inch)
More than 2.0g•cm
(More than 0.027 oz•inch)
More than 50 g•cm
(More than 0.69 oz•inch)
TAPE SECTION
Signal
3 kHz, 0 dB
Used for
Tape speed adjustment
Tape
WS-48A
Test Tape
Tape Speed Adjustment
Procedure:
Mode: Playback
Adjustment Value: normal tape speed
Adjust the tape speed adjustment RV601, so that the freqency counter
reading becomes 2,985Hz.
Specification Value:
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location:
Test tape
WS-48A
(3kHz, 0dB)
Set
J301 (phones)
16
Ω
digital frequency
counter
+
–
Digital frequency counter
2,970 to 3,000Hz
0dB=0.775V
RV601
