Sony Walkman WM-FX171, Руководство по обслуживанию

Страница: 6 / 30

— 6 —
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.
Torqu Measurement
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF
REW
Torque meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
20 - 30 g · cm
0.4 - 2.0 g · cm
20 - 30 g · cm
0.4 - 2.0 g · cm
More than 40 g · cm
PRECAUTION
1. Specified voltage : 3.0V
2. Switch position
AVLS switch
: NORM
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 3,000Hz ± 15Hz.
2. Playback WS-48A (Tape top and end).
Check that frequency counter reading is within 1.5% of the
reading of step1.
Adjustment Point :
[MAIN BOARD] — SIDE B —
Type
WS-48A
Signal
3kHz, 0dB
Purpose
Tape Speed Adjustment
Test tape
WS-48A
(3kHz, 0dB)
Set
* 1
PHONES jack
+
–
Frequency counter
RV601 : Tape Speed
*1
16
Ω
: E, EA, C & SA, PA Models.
32
Ω
: AEP, IT, E, CND, FR Models.
• Abbreviation
CND : Canadian
IT : Italian
EE : East European
EA : Saudi Arabia
FR : French
PA : Panama
C & SA : Central and South America