SECTION 5 MECHANICAL ADJUSTMENTS SECTION 6 ELECTRICAL ADJUSTMENTS Precaution 1. Clean the following parts with a denatured alcohol-moistened swab: record/playback heads pinch rollers erase head rubber belts capstan idlers 2. Demagnetize the record/playback head with a head demagne- tizer. 3. Do not use a magnetized screwdriver for the adjustments. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power sup- ply voltage unless otherwise noted. DECK SECTION 0 dB=0.775V 1. Demagnetize the record/playback head with a head damagnetizer. 2. Do not use a magnetized screwdriver for the adjustments. 3.
After the adjustments, apply suitable locking compound to the parts adjusted. 4. The adjustments should be performed with the rated power sup- ply voltage unless otherwise noted. 5. The adjustments should be performed in the order given in this service manual. (As a general rule, playback circuit adjustment should be completed before performing recording circuit adjust- ment.) 6. The adjustments should be performed for both L-CH and R-CH. 7. Switches and controls should be set as follows unless otherwise specified. Torque Measurement Record/Playback Head Azimuth Adjustment (Deck A, Deck B) Note: Perform this adjustments for both decks. Procedure: 1. Mode :
Playback test tape P-4-A100 (10kHz, –10dB) MD OUT 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 1 dB of peak.
L-CH peak output level within 1 dB within 1dB R-CH peak screw position L-CH peak R-CH peak screw position Mode Torque meter Meter reading FWD CQ-102C 31 to 71 g • cm (0.43 – 0.98 oz • inch) FWD back tension CQ-102C 2 to 6 g • cm (0.02 – 0.08 oz • inch) REV CQ-102RC 31 to 71 g • cm (0.43 – 0.98 oz • inch) REV back tension CQ-102RC 2 to 6 g • cm (0.02 – 0.08 oz • inch) FF/REW CQ-201B 71 to 143 g • cm (0.98 – 1.99 oz • inch) FWD tension CQ-403A 100 g or more (3.53 oz or more) REV tension CQ-403R 100 g or more (3.53 oz or more) Tape Signal Used for P-4-A100 10 kHz, –10 dB Azimuth Adjustment WS-48B 3 kHz, 0 dB Tape Speed Adjustment P-4-L300 315 Hz, 0 dB Level Adjustment