SONY HCD-EC70
Instrukcja Serwisowa

HCD-EC70 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. 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 FWD FWD back tension FF Torque meter CQ-102AS 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)

SECTION 5 ELECTRICAL ADJUSTMENTS
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 + �

CQ-102C

CQ-201AS

REW

CQ-201B

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.

� Tape Tension Measurement
Mode FWD Tension Meter CQ-403A Meter Reading more than 80 g (more than 2.82 oz)

L-CH peak Output level

within 1dB within 1dB

Screw position

R-CH peak L-CH peak R-CH peak

Screw position

3. Mode: Playback
test tape P-4-A063 JACK board (6.3 kHz, �10 dB) PHONES jack oscilloscope (J102) V set H

waveform of oscilloscope

in phase 45° good

90° 135° 180° wrong

4. After the adjustments, apply suitable locking compound to the pats adjusted.

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