Sony CFD-G30L - 4 Adjustment; Mechanical Adjustment; Electrical Adjustment

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SECTION 4
ADJUSTMENTS
Torque Meter
CQ-403A
Meter Reading
more than 60 g
(more than 2.12 oz)
4-2. ELECTRICAL ADJUSTMENT
Standard output level
Test tape
Tape Speed Adjustment
Procedure :
Mode : Playback
Adjustment Value : normal tape speed
Adjust the tape speed adjustment control inside motor, so that the
frequency counter reading becomes 3,000 Hz.
Specification Value :
Frequency difference between the beginning and the end of the
tape should be within 1.5% (45 Hz).
Adjustment Location :
HP OUT
32 Ω
0.25 V (–10 dB)
Output
Load impedance
Output signal level
Test Tape
WS-48A
Used for
Tape speed adjustment
Signal
3 kHz, 0 dB
4-1. MECHANICAL ADJUSTMENT
PRECAUTION
1. Clean the following parts with a denatured-alchool-moistened
swab:
record/playback head pinch roller
erase head rubber belts
capstans
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close to
the erase head.)
Torque Measurement
Tape Tension Measurement
Meter Reading
18 – 60 g•cm
(0.25 – 0.83 oz•inch)
1.0 – 5.0 g•cm
(0.014 – 0.069 oz•inch)
45 – 95 g•cm
(0.62 – 1.32 oz•inch)
45 – 95 g•cm
(0.62 – 1.32 oz•inch)
Mode
FWD
FWD
back tension
Fast Forward
Rewind
Torque Meter
CQ-102C
CQ-201B
0dB = 0.775V
TAPE RECODER SECTION
Tape speed adjustment
control inside motor
32 Ω
test tape
WS-48A
(3kHz, 0dB)
set
digital frequency
counter
J391 (phones)
+
–
Digital frequency counter
2,940 – 3,060Hz