Sony Walkman WM-EX402, Руководство по обслуживанию

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PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head pinch roller
capstan rubber belt
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.
5. The adjustments should be performed with the rated power
supply voltage (2.5 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
20 – 42 g • cm
FWD
CQ-102C
(0.28 – 0.58 oz • inch)
FWD less than 2 g • cm
back tension (less than 0.03 oz • inch)
20 – 42 g • cm
REV
CQ-102RC
(0.28 – 0.58 oz • inch)
REV less than 2 g • cm
back tension (less than 0.03 oz • inch)
more than 50 g • cm
FF, REW CQ-201B
(more than 0.69 oz • inch)
SECTION 4
ELECTRICAL ADJUSTMENTS
SECTION 3
MECHANICAL ADJUSTMENTS
PRECAUTION
•
Supplied voltage : 2.5 V
•
Switches and control position
TAPE switch : NORM
GROOVE/MEGA BASS/
NORMAL switch
: NORMAL (EX402/EX404)
SOUND switch : NORMAL (EX405/EX406)
VOL control : maximum
AVLS switch : NORM
DOLBY NR switch : OFF (Except EX402)
Test Tape
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
Tape Speed Adjustment
Procedure :
1. Playback WS-48A (tape center part) in the REV state and
adjust RV601 so that the frequency counter reading becomes
3,000 Hz.
2. Playback WS-48A (tape center part) in the FWD state.
Check that frequency counter reading is within
±
1.5% of the
reading of step 1.
Adjustment Location :
test tape
WS-48A
(3 kHz, 0 dB)
set
16
Ω
2
jack
frequency counter
RV601