Mechanical Adjustments; Electrical Adjustments - Sony WM-FX673 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
rubber belts
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
FWD
CQ-102C
FWD
Back Tension
REV
CQ-102RC
REV
Back Tension
FF, REW CQ-201B
pinch roller
capstan
Meter reading
16 – 25 g•cm
(0.23 – 0.34 oz•inch)
0.5 – 1.5 g•cm
(0.007 – 0.02 oz•inch)
16 – 25 g•cm
(0.23 – 0.34 oz•inch)
0.5 – 1.5 g•cm
(0.007 – 0.02 oz•inch)
more than 50 g•cm
(more than 0.7 oz•inch)
– 12 –
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
1. Specified voltage
2. Setting
BL SKIP
SOUND RV/MB/GRV : OFF
AVLS
aNR
TAPE DECK SECTION
Test tape
Type Signal
WS-48A 3 kHz, 0 dB
Tape Speed Adjustment
Setting:
Function: TAPE
Test tape
WS-48A
(3 kHz, 0 dB)
set
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)
: 1.3 V (DC)
: OFF
: OFF
: OFF
0 dB=0.775 V
Used for
Tape Speed Adjustment
frequency counter
16 Ω
+
–
2 REMOTE jack (J701)