Mechanical Adjustments; Electrical Adjustments - Sony TCM-50DV Service Manual

SECTION 4
QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head
capstan
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
FWD
CQ-102C
FWD
back tension
REV
CQ-102RC
REV
back tension
FF, REW CQ-201B
TE
L 13942296513
SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION
• Supplied voltage : DC 3.0 V
• Switch and control position
VOL control
MIC SENS switch
V•O•R switch
SPEED CONTROL control : mechanical center
Test Tape
Type Signal
WS-48A 3 kHz, 0 dB
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pinch roller
rubber belt
Meter Reading
15 – 25 g • cm
(0.21 – 0.35 oz • inch)
less than 2 g • cm
(less than 0.03 oz • inch)
15 – 25 g • cm
(0.21 – 0.35 oz • inch)
less than 2 g • cm
(less than 0.03 oz • inch)
more than 50 g • cm
(more than 0.69 oz • inch)
: max (10)
: free (L or H)
: free (OFF or ON)
Used for
tape speed adjustment
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8
Tape Speed Adjustment
Procedure :
test tape
WS-48A
(3 kHz, 0 dB)
set
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
2,985 to 3,015 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.
Q Q
3 6 7 1 3
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 :
–main board (conductor side)–
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.
– 10 –
2 9 9 4 2 8
digital
frequency counter
8 Ω
EAR jack
REC TIME : DOUBLE
1,485 to 1,515 Hz
1 5 0 5 8 2 9 9 4
RV602
RV601
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9 9
2 8 9 9