Mechanical Adjustments; Electrical Adjustments - Sony TC-TX313 Service Manual

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MECHANICAL ADJUSTMENTS

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1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head
rubber belts
idlers
2. Demagnetize the record/playback/erase head with a head
demagnetizer. (Do not bring the head demagnetizer close to the
erase head.)
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 unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD
FWD
Back tension
REV
CQ-102RC
REV
Back tension
FF, REW
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SECTION 4
PRECAUTION
pinch roller
capstan
Meter Reading
35 – 80 g • cm
(0.49 – 1.11 oz • inch)
CQ-102C
1 – 7 g • cm
(0.012 – 0.097 oz • inch)
35 – 80 g • cm
(0.49 – 1.11 oz • inch)
1 – 7 g • cm
(0.012 – 0.097 oz • inch)
more than 40 g • cm
CQ-201B
(more than 0.56 oz • inch)
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ELECTRICAL ADJUSTMENTS

8
1. The adjustment should be performed in the publication.
(Be sure to male playback adjustment at first.)
2. The adjustments and measurement should be performed for both
L-CH and R-CH.
• Switch position
DOLBY NR switch : OFF
DIRECTION switch : A
Standard Input Level
Input terminal
source impedance
input signal level
Standard Output Level
Output terminal
load impedance
output signal level
Test Tape
Type
P-4-A100
P-4-L300
WS-48A
0 dB = 0.775 V
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SECTION 5
2 9 9 4 2 8
PRECAUTION
0.49 V (– 4 dB)
TAPE OUT (L-CH)
0.49 V (– 4 dB)
Signal
10 kHz, –10 dB Azimuth Adjustment
315 Hz, 0 dB PB Level Adjustment
3 kHz, 0 dB Tape Speed Adjustment
1 5 0 5 8 2 9 9 4
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9 9
TAPE IN
10 kΩ
47 kΩ
Used for
2 8 9 9