Sony TC-TX313, Service Manual

Page: 13 / 34

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PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head pinch roller
rubber belts capstan
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 Meter Reading
35 – 80 g • cm
FWD
CQ-102C
(0.49 – 1.11 oz • inch)
FWD 1 – 7 g • cm
Back tension (0.012 – 0.097 oz • inch)
35 – 80 g • cm
REV
CQ-102RC
(0.49 – 1.11 oz • inch)
REV 1 – 7 g • cm
Back tension (0.012 – 0.097 oz • inch)
more than 40 g • cm
FF, REW CQ-201B
(more than 0.56 oz • inch)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
PRECAUTION
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 TAPE IN
source impedance 10 k
Ω
input signal level 0.49 V (– 4 dB)
Standard Output Level
Output terminal TAPE OUT (L-CH)
load impedance 47 k
Ω
output signal level 0.49 V (– 4 dB)
Test Tape
Type Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
P-4-L300 315 Hz, 0 dB PB Level Adjustment
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
0 dB = 0.775 V