XR-C750 - Sony Car Audio Service Manual (repair manual). Page 22

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1. Wipe the following components with an absorbent cotton cloth

moistened with alcohol before adjustment :

PB head

Pinch roller

Idler

Rubber belt

Capstan

2. Demagnetize the PB head using a head demagnetizer.
3. Be careful not to use a magnetized screwdriver.
4. After the adjustment is completed, lock the adjustment parts using

screws.

5. Unless otherwise specified, make adjustments at the specified

voltage (14.4 V).

35 – 65 g • cm

FWD

CQ-102C

(0.49 – 0.90 oz • inch)

FWD

0.5 – 5.0 g • cm

Back Tension

(0.01 – 0.07 oz • inch)

35 – 65 g • cm

REV

CQ-102RC

(0.49 – 0.90 oz • inch)

REV

0.5 – 5.0 g • cm

Back Tension

(0.01 – 0.07 oz • inch)

60 – 200 g • cm

FF, REW

CQ-201B

(0.83 – 2.78 oz • inch)

FWD

CQ-403A

more than 60 g

REV

CQ-403R

(more than 2.12 oz)

 See the adjustment location from on page 25 for the adjust-
 ment.

Tape Speed Adjustment
Procedure :
1. Put the set into the FWD PB mode.

10 k Ω

Specification : Constant speed

– 1.5 to + 2.5 %

2,955 to 3,075 Hz

Adjustment Location : See page 25.

DOLBY Level Adjustment
setting :

SHIFT button

: ON (light up SET UP
  and PLAY MODE)

Preset  3  (PLAY MODE) button : NR off
SOUND (BAS) button

: Center

SOUND (TRE) button

: Center

SOUND (BAL) button

: Center

SOUND (FAD) button

: Center

SOUND (VOL) button

: Maximum

Procedure :
1. Put the set into the FWD PB mode.
2. Adjust RV251 (L-CH) and RV261 (R-CH) so that level meter

reading is – 6 ± 0.5 dB (0.37 to 0.41 V).

Adjustment Location : See page 25.