Sony WM-FX673, Service Manual

Page: 12 / 25

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SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belts capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage (1.3 V) unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
FWD
16 – 25 g•cm
CQ-102C
(0.23 – 0.34 oz•inch)
FWD 0.5 – 1.5 g•cm
Back Tension (0.007 – 0.02 oz•inch)
REV
16 – 25 g•cm
CQ-102RC
(0.23 – 0.34 oz•inch)
REV 0.5 – 1.5 g•cm
Back Tension (0.007 – 0.02 oz•inch)
FF, REW CQ-201B
more than 50 g•cm
(more than 0.7 oz•inch)
Tape Speed Adjustment
Setting:
Function: TAPE
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Values: 2,970 to 3,030 Hz
3. Playback WS-48A (tape center) in the REV state.
Check that the frequency counter reading is within 2%
(approx.60 Hz) of the reading of step 1.
Adjustment Location: MAIN BOARD (See page 13)
PRECAUTION
1. Specified voltage : 1.3 V (DC)
2. Setting
BL SKIP : OFF
SOUND RV/MB/GRV : OFF
AVLS
: OFF
a
NR : OFF
TAPE DECK SECTION 0 dB=0.775 V
Test tape
Type Signal Used for
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
+
–
set
Test tape
WS-48A
(3 kHz, 0 dB)
frequency counter
16
Ω
2
REMOTE jack (J701)