SONY CFDS300
Service Manual

CFD-S300 SECTION 4 MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened swab : record/playback head pinch roller erase head rubber belts capstan idlers 2. Demagnetize the record/playback head with a head demagnetizer. (Do not bring the head magnetizer close to the erase head.) 3. Do not use a magnetized screwdriver for the adjustments. 4. The adjustments should be performed with the rated power supply voltage (9V) unless otherwise noted. Torque Measurement Mode FWD Torque meter CQ-102C Meter reading 2.95 � 6.86 mN � m (30 � 70 g � cm) (0.42 � 0.97 oz � inch) 0.15 � 0.53 mN � m FWD Back Tension CQ-102C (1.5 � 5.5 g � cm) (0.021 � 0.076 oz � inch) more than 5.88 mN � m (more than 60 g � cm) (more than 0.83 oz � inch) more than 5.88 mN � m (more than 60 g � cm) (more than 0.83 oz � inch) Tape Speed Adjustment Procedure: Mode: playback
test tape WS-48A (3 kHz, 0 dB) 32 � set digital frequency counter

SECTION 5 ELECTRICAL ADJUSTMENTS
TAPE SECTION 0 dB = 0.775 V

� Standard Output Level Output terminal load impedance output signal level � Test Tape Type WS-48A Signal 3 kHz, 0 dB Used for tape speed adjustment HP OUT 32 � 0.25 V (�10 dB)

FF

CQ-201B

i jack (J321)

REW

CQ-201B

Adjust so that the value on the digital frequency counter is 3,000 Hz. Specification Value: Digital frequency counter

Tape Tension Measurement Mode FWD Tension meter CQ-403A Meter Reading more than 100 g (more than 3.53 oz)

2,940 to 3,060 Hz Adjust so that the frequency at the beginning and that at the end of tape winding are between 2,970 to 3,030 Hz. Adjustment Location:

Tape speed adjustment control inside motor

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