7
WM-GX410
3-2. ELECTRICAL ADJUSTMENTS
Note:
1. Supplied voltage: 3 V (DC)
2. Switch and control position
VOLUME control
: output level < > :AEP
FM -20dBm <-30dBm>
AM-30dBm <-40dBm>
AVLS switch
: NORM
REC TIME/PLAY MODE switch : NORMAL
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:
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
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 performed with the rated power
supply 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)
set
test tape
WS-48A
(3kHz, 0dB)
16
Ω
frequency counter
i
headphone jack (J401)
SECTION 3
ADJUSTMENTS
1
9
C337
R354
R605
R607 R601
C339
TH601
RV602
C606
C336
R3
R423
RV601
C333
R606
C410
R609
Q342
R336
C221
R338
R337
R344
R309
C332
C70
Q336
84
R340
FB303
306
R339
C340
Q335
CN303
C338
R341
Q334
R335
413
C86
E
C
C
B
B
RV602: Tape Speed Adjustment
(4.8cm/s)
RV601: Tape Speed Adjustment
(2.4cm/s)
RV601
RV602
[MAIN BOARD] (SIDE B)
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)
: 1,493Hz - 1,507Hz
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: Main board (See page 9)
