Sony WM-GX707 - Adjustments; Mechanical Adjustments; Electrical Adjustment 0.00

SECTION 4
ADJUSTMENTS
4-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-
alcohol-moistened swab :
rubber belts
idlers
playback head
capstan
pinch roller
2. Demagnetize the playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the ad-
justments.
4. After the adjustments, apply suitable locking
compound to the parts adjusted.
5. The adjustments should be performed with the
rated power supply voltage (1.3V) unless other-
wise noted.
Torque Measurement
21 — 38 g*cm
(0.29 — 0.53 oz*inch)
FWD :
Back Tension
REV
REV
Back Tension
CQ-201B
prew | .
CQ-102C
0.5 — 3 gecm
(0.01 — 0.04 ozsinch)
21 — 38 g*cm
(0.29 — 0.53 oz*inch)
CQ-102RC
0.5 — 3 gecm
(0.0) — 0.04 ozsinch)
more than 60 g*cm
(more than 0.84 ozinch)
Tape Pulling Force Measurement
more than 40 g
(more than 1.4 02)
4-2. ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Power supply voltage : 1.3V
2. Switch position
DOLBY NR switch : OFF
EX DBB switch : NORM
3.
For
electrical
adjustments,
use
the
supplied
plug
conversion
adaptor (Part No. 1-691-322-11)
Test Tape
3 kHz, 0 dB Tape Speed Adjustment |
TAPE SPEED ADJUSTMENT
Procedure :
test tape
WS-48A frequency
(3kHz, 0 dB) 18Q _counter
PHONE
1. Play back WS-48A (tape center portion) in FWD
mode. Adjust the RV601 so that the frequency
counter reads 3,000 + 30Hz.
2. Play back WS-48A (tape center portion) in REV
mode. Confirm that the reading of frequency
counter is within 2.5% from the reading in step 1.
Adjustment Parts Location Diagram :
MAIN BOARD — SIDE A —