Sony Pressman TCM-50DV, Service Manual, Page: 10 / 28

– 10 –
test tape
WS-48A
(3 kHz, 0 dB)
set
8 Ω
EAR jack
digital
frequency counter
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head pinch roller
capstan rubber belt
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 (1.3 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter Meter Reading
15 – 25 g • cm
FWD
CQ-102C
(0.21 – 0.35 oz • inch)
FWD less than 2 g • cm
back tension (less than 0.03 oz • inch)
15 – 25 g • cm
REV
CQ-102RC
(0.21 – 0.35 oz • inch)
REV less than 2 g • cm
back tension (less than 0.03 oz • inch)
more than 50 g • cm
FF, REW CQ-201B
(more than 0.69 oz • inch)
SECTION 4
MECHANICAL ADJUSTMENTS
1. REC TIME : NORMAL/FWD
·
Playback WS-48A (tape center part) and adjust RV601 so that
reading on the digital frequency counter becomes 3,000 Hz.
2. REC TIME : DOUBLE/FWD
·
Playback WS-48A (tape center part) and adjust RV602 so that
reading on the digital frequency counter becomes 1,500 Hz.
Specification Value :
Digital Frequency Counter Reading
REC TIME : NORMAL REC TIME : DOUBLE
2,985 to 3,015 Hz 1,485 to 1,515 Hz
3. REC TIME : NORMAL/REV
ª
Playback WS-48A (tape center part) and confirm that the
reading on digital frequency counter are between 2,985 to 3,015
Hz.
4. REC TIME : DOUBLE/REV
ª
Playback WS-48A (tape center part) and confirm that the
reading on digital frequency counter are between 1,435 to 1,515
Hz.
Adjustment Location :
Tape Speed Adjustment
Procedure :
SECTION 5
ELECTRICAL ADJUSTMENTS
PRECAUTION
•
Supplied voltage : DC 3.0 V
•
Switch and control position
VOL control : max (10)
MIC SENS switch : free (L or H)
V•O•R switch : free (OFF or ON)
SPEED CONTROL control : mechanical center
Test Tape
Type Signal Used for
WS-48A 3 kHz, 0 dB tape speed adjustment
RV602
RV601
–main board (conductor side)–
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