Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony Walkman WM-FX571 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcahol-moistened
sweb :
Playback head
Rubber belt
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 (1.3V) to
perform the adjustments.
Torque Measurement
Mode Torque meter
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF
CQ-201B
REW
Pinch roller
Capstan
Meter reading
20 to 30 g · cm
(0.28 to 0.42 oz · inch)
0.4 to 2.0 g · cm
(0.0056 to 0.028 oz · inch)
20 to 30 g · cm
(0.28 to 0.42 oz · inch)
0.4 to 2.0 g · cm
(0.0056 to 0.028 oz · inch)
More than 40 g · cm
(More than 0.56 oz · inch)
SECTION 5

ELECTRICAL ADJUSTMENTS

1. Specified voltage : 1.3V
2. Switch position
MENU button : a NR light off (OFF)
: AVLS light off (OFF)

TAPE SECTION

Test Tape
Type Signal
WS-48A 3kHz, 0dB
Tape Speed Adjustment
Procedure :
Test tape
WS-48A
(3kHz, 0dB)
1. Playback WS-48A (Tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value:
Digital frequency counter
2,970 to 3,030 Hz
2. Playback WS-48A (Tape center part) in the REV state.
Check that frequency counter reading is within 60 Hz of the
reading of step1.
Adjustment Location :
[MAIN BOARD] — SIDE A —
– 7 –
PRECAUTION
0 dB=0.775 V
Purpose
Tape Speed Adjustment
Frequency counter
16 Ω
+
set
–
2 REMOTE jack (J701)
RV601 : Tape speed