Sony Walkman WM-EX921, Руководство по обслуживанию

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11
WM-EX921
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.
(Do not bring the head demagnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
(1.47 – 2.94 mN•m)
FWD 15 – 25 g•cm
CQ-102C
(0.22 – 0.36 oz•inch)
(0.029 – 0.196 mN•m)
FWD
0.3 – 2.0 g•cm
Back Tension
(0.004 – 0.01 oz•inch)
(1.47 – 2.94 mN•m)
REV 15 – 25 g•cm
CQ-102RC
(0.22 – 0.36 oz•inch)
(0.029 – 0.196 mN•m)
REV
0.3 – 2.0 g•cm
Back Tension
(0.004 – 0.01 oz•inch)
(more than 3.43 mN•m)
FF, REW CQ-201B more than 35 g•cm
(more than 0.5 oz•inch)
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
Precaution
1. Specified voltage : 1.3 V (DC)
2. Switch position
VOL/AVLS switch : Center (NOR)
3. Remote control setting
HOLD switch : OFF
VOL knob : MAX
DOLBY NR : OFF
SOUND mode : Normal
0 dB=0.775 V
Test tape
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
Tape Speed Adjustment
Setting:
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut RV601 so that the frequency counter reading becomes
3,000 Hz.
Specified Values: 2,985 to 3,015 Hz
3. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2.0%
(approx.60 Hz) of the reading of step 1.
Adjustment Location:
– MAIN Board –
frequency counter
test tape
WS-48A
(3 kHz, 0 dB)
set
i jack (J301)
–
+
32
Ω
RV601