6
WM-GX400
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback/erase head pinch roller
capstan rubber belts
2. Demagnetize the record/playback/erase head with a head demag-
netizer. (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 sup-
ply voltage unless otherwise noted.
6. Power supply voltage : 3V DC.
Torque Measurement
Mode Torque Meter Meter Reading
1.97 to 3.92 mN • m
Forward/Reverse CQ-102C (20 to 40 g • cm)
(0.28 to 0.55 oz• inch)
0.05 to 0.49 mN • m
Forward
CQ-102C (0.5 to 5.0 g • cm)
Back Tension
(0.007 to 0.07 oz• inch)
0.05 to 0.49 mN • m
Reverse
CQ-102RC (0.5 to 5.0 g • cm)
Back Tension
(0.007 to 0.07 oz• inch)
Fast Forward
more than 4.90 mN • m
and Rewind
CQ-201B (50 g • cm)
(0.7 oz• inch)
3-2. ELECTRICAL ADJUSTMENTS
Note:
1. Supplied voltage: 3 V (DC)
2. Switch and control position
VOLUME control : maximum
SPEAKER/HEADPHONE switch : i (headphone)
AVLS switch : OFF
FUNCTION switch : OFF
ISS switch : 1
TAPE DECK SECTION 0 dB = 0.775 V
Test Tape
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
Tape Speed Adjustment
Procedure:
1. Set REC TIME switch (S706) to NORMAL (4.8cm/s).
2. Play back the center portion of tape in REVmode, adjust RV602
so that the reading on the frequency counter becomes 3,000 Hz.
3. Set REC TIME switch (S706) to DOUBLE (2.4cm/s).
4. Play back the center portion of tape in REVmode, adjust RV601
so that the reading on the frequency counter becomes 1,500 Hz.
Specifications:
NORMAL (4.8cm/s) : 2,985Hz - 3,015Hz
DOUBLE (2.4cm/s) : 1,485Hz - 1,515Hz
5. Confirm the frequency difference between the beginning and
the end of tape should be 1.5%.
NORMAL (4.8cm/s) : 45Hz
DOUBLE (2.4cm/s) : 22.5Hz
Adjustment Location:
SECTION 3
ADJUSTMENTS
set
test tape
WS-48A
(3kHz, 0dB)
16Ω
frequency counte
i headphone jack (J301)
IC1
IC301
TP1
RV602
RV601
TP2
GND
RV601: Tape Speed Adjustment (2.4cm/s)
RV602: Tape Speed Adjustment (4.8cm/s)
[MAIN BOARD] (SIDE B)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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