Sony HCD-EC50 Service Manual - Page 12

HCD-EC50 SECTION 4 MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL 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. After the adjustments, appiy suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power supply voltage unless otherwise noted. • Torque Measurement Mode Torque meter FWD CQ-102AS FWD back tension FF CQ-102C CQ-201AS REW CQ-201B Meter reading 2.0 - 8.0 mN • m (20 to 80 g • cm) (0.28 - 1.12 oz • inch) 0.15 - 0.6 mN • m (1.5 to 6 g • cm) (0.021 - 0.083 oz • inch) 5 - 17.7 mN • m (50 to 177 g • cm) (0.7 - 2.48 oz • inch) 5 - 17.7 mN • m (50 to 177 g • cm) (0.7 - 2.48 oz • inch) • Tape Tension Measurement Mode Tension Meter FWD CQ-403A Meter Reading more than 80 g (more than 2.82 oz) DECK SECTION 0 dB=0.775 V 1. Demagnetize the record/playback head with a head demagnetizer. 2. Do not use a magnetized screwdriver for the adjustments. • Test Tape Tape P-4-A063 Signal 6.3 kHz, -10 dB Used for Azimuth Adjustment RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT Procedure: 1. Mode: Playback test tape P-4-A063 (6.3 kHz, −10 dB) JACK board PHONES jack (J102) level meter set + - 2. Turn the adjustment screw and check output peaks. If the peaks do not match for L-CH and R-CH, turn the adjustment screw so that outputs match within 1dB of peak. L-CH peak within 1dB Output level within 1dB Screw position R-CH peak L-CH R-CH peak peak Screw position 3. Mode: Playback test tape P-4-A063 JACK board (6.3 kHz, −10 dB) PHONES jack (J102) oscilloscope VH set waveform of oscilloscope in phase 45° 90° 135° 180° good wrong 4. After the adjustments, apply suitable locking compound to the pats adjusted. 12