— 7 —
SECTION 4
MECHANICAL 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 (1.3V) to
perform the adjustments.
Torqu Measurement
Mode
FWD
FWD
Back Tension
REV
REV
Back Tension
FF
REW
Torqu meter
CQ-102C
CQ-102RC
CQ-201B
Meter reading
20 to 30 g · cm
0.4 to 2.0 g · cm
20 to 30 g · cm
0.4 to 2.0 g · cm
More than 40 g · cm
SECTION 5
ELECTRICAL ADJUSTMENT
PRECAUTION
1.
Specified voltage : 1.3V
2.
Switch position
DOLBY NR switch
: OFF
AVLS switch
: OFF
CASSETTE SECTION
Test Tape
Tape Speed Adjustmnet
Procedure :
1.
Playback WS-48A (Tape center part) in the FWD state and
adjust RV601 so that the frequency counter reading becomes
2,970Hz to 3030Hz.
2.
Playback WS-48A (Tape center) in the REV state.
Check that frequency counter reading is within 60Hz of the
reading of step1.
Adjustment Point :
[MAIN BOARD]
— SIDE A —
Type
WS-48A
Signal
3kHz, 0dB
Purpose
Tape Speed Adjustment
Test tape
WS-48A
(3kHz, 0dB)
Set
16
Ω
PHONES jack
+
–
Frequency counter
RV601 : Tape speed
Summary of Contents for Walkman WM-FX661
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