Sony RWALKMAN WM-FX487, Руководство по обслуживанию, Страница: 8 / 31

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SECTION 3
MECHANICAL ADJUSTMENT
SECTION 4
ELECTRICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alcahol-moistened
sweb :
Playback head
Pinch roller
Rubber belt Capstan
2. Demagnetize the playback head using a demagnetizer.
3. Do not use a magnetized screwdriver for adjustments.
4. After adjusting, apply screw-locking compound onto the
adjusted parts.
5. Unless specified otherwise, use a specified voltage (3.0V) to
perform the adjustments.
Torque Measurement
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF
REW
Torque meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
20 - 42 g · cm
(0.28-0.58 oz · inch)
Less than 2 g · cm
(Less than 0.03 oz · inch)
20 - 42 g · cm
(0.28-0.58 oz · inch)
Less than 2 g · cm
(Less than 0.03 oz · inch)
More than 50 g · cm
(More than 0.69 oz · inch)
PRECAUTION
1. Specified voltage : 3.0V
2. Switch and control position
MENU switch
MENU
→
TAPE
→
SET : NORM
MENU
→
SOUND
→
SET : No message
MENU
→
AVLS
→
SET : No message
MENU
→
a NR
→
SET : OFF (FX485/FX487)
VOL control : maximum
CASSETTE SECTION
Test Tape
Tape Speed Adjustmnet
Procedure :
1. Playback WS-48A (Tape center part) and adjust RV601 so that
the frequency counter reading becomes 2,985Hz to 3,015Hz.
2. Playback WS-48A (Tape top and end).
Check that frequency counter reading is within 1.5% of the
reading of step1.
Adjustment Point :
Type
WS-48A
Signal
3kHz, 0dB
Purpose
Tape Speed Adjustment
Test tape
WS-48A
(3kHz, 0dB)
Set
16
Ω
PHONES jack
+
–
Frequency counter
RV601