SONY WMFS420/RS
Manual de Servicio

SECTION 4 MECHANICAL ADJUSTMENT
1. PRECAUTION Clean the following parts with a denatured-alcohol-moistened swab: playback head pinch roller rubber belts capstan Do not use a magnetized screwdriver for the adjustments.

SECTION 5 ELECTRICAL ADJUSTMENT
TAPE SECTION
Test Tape Tape WS-48A Signal 3 kHz, 0 dB Used for Tape speed adjustment 0 dB = 0.775 V

2.

Torque Measurement Mode Torque Meter FWD FWD Back Tension FF, REW CQ-102C CQ-102C CQ-201B

Meter Reading 20 to 42 g�cm (0.27 to 0.58 oz�inch) More than 2.0 g�cm (More than 0.027 oz�inch) More than 50 g�cm (More than 0.69 oz�inch)

Tape Speed Adjustment Procedure: Mode: Playback
Test tape WS-48A (3 kHz, 0 dB) 16 � + � digital frequency counter

Set

J301 (phones)

Adjustment Value: normal tape speed Adjust the tape speed adjustment RV601, so that the freqency counter reading becomes 3,000Hz. Specification Value: Digital frequency counter 2,970 to 3,030 Hz Frequency difference between the beginning and the end of the tape should be within 1.5 % (45 Hz). Adjustment Location:

RV601

�7�