7
WM-FS421
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.
Do not use a magnetized screwdriver for the adjustments.
Torque Measurement
Mode
FWD
FWD
Back Tension
FF, REW
Torque Meter
CQ-102C
CQ-102C
CQ-201B
Meter Reading
2.0 to 4.1 N•m
(20 to 42 g•cm)
(0.27 to 0.58 oz•inch)
More tham 0.20 N•m
(More than 2.0 g•cm)
(More than 0.027 oz•inch)
More tham 4.9 N•m
(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 3,000Hz.
Specification Value:
Frequency difference between the beginning and the end of the tape
should be within 1.5 % (45 Hz).
Adjustment Location:
Digital frequency counter
2,970 to 3,030 Hz
0 dB = 0.775 V
Test tape
WS-48A
(3 kHz, 0 dB)
Set
J301 (
i
)
16
Ω
digital frequency
counter
+
–
RV601
