Mechanical Adjustment; Electrical Adjustment - Sony TCM-343 Service Manual

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MECHANICAL ADJUSTMENT

3 7 63 1515 0
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (DC 3.0 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD
FWD
back tension
FF, REW
TE
L 13942296513
Adjustment Location : main board (conductor side)
www
RV601
.
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SECTION 3
PRECAUTION
pinch roller
rubber belt
Meter Reading
more than 1.96 mN • m
(more than 20 g • cm)
(more than 0.28 oz • inch)
CQ-102C
0.05 – 0.29 mN • m
(0.5 – 3 g • cm)
(0.007 – 0.04 oz • inch)
more than 4.90 mN • m
(more than 50 g • cm)
CQ-201B
(more than 0.69 oz • inch)
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y
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ELECTRICAL ADJUSTMENT

8
• Supplied voltage
• Switch and control position
VOL control
PAUSE switch : OFF
Test tape
Type
WS-48A
P-4-A063
REC/PB Head Azimuth Adjustment
Procedure :
1. Model : playback
test tape
P-4-A063
(6.3 kHz, -10 dB)
2. Turn the adjustment screw to obtain the maximum readig on
level meter.
Note : Several peaks may appear, but take the maximum.
Adjustment Location :
Q Q
3 6 7 1 3
adjustment screw
Tape Speed Adjustment
Procedure :
test tape
WS-48A
(3 kHz, 0 dB)
1. Playback WS-48A (tape center part) in the FWD state and adjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
u163
Digital frequency counter
2,970 to 3,030 Hz
.
2. Check that frequency counter reading is within 2% of reading
of step 1.
— 5 —
SECTION 4
2 9 9 4 2 8
PRECAUTION
: 3.0 V
: mechanical mid
Signal
3 kHz, 0 dB tape speed adjustment
6.3 kHz, - 10dB head azimuth adjustment
10 kΩ
set
EAR jack (J102)
1 5 0 5 8 2 9 9 4
frequency counter
32 Ω
set
EAR jack (J102)
m
co
9 9
Used for
level meter
+
–
2 8 9 9
+
–