CFD-131 - Sony Audio Service Manual (repair manual). Page 13

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load impedance

32 Ω

output signal level

0.25 V (–10 dB)

WS-48A

3 kHz, 0 dB

tape speed adjustment

P-4-A063

6.3 kHz, –10 dB

head azimuth adjustment

Procedure :
Mode: playback

– 0.5 to + 0.5 %

2,985 to 3,015 Hz

speed checker
LFM-30
           or
digital frequency
counter

set

phones jack

32 

Ω

test tape
WS-48A
(3 kHz, 0 dB)

Frequency difference between the beginning and the end of the tape
should be within ± 1.5 % (45 Hz).

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, apply suitable locking compound to the parts
    adjusted.
5. The adjustments should be performed with the rated power supply
    voltage unless otherwise noted.

30–70 g • cm

FWD

CQ-102C

(0.42–0.97 oz • inch)

FWD

CQ-102C

1.5–5.5 g • cm

Back Tension

(0.021–0.076 oz • inch)

30–70 g • cm

REV

CQ-102RC

(0.42–0.97 oz • inch)

REV

CQ-102RC

1.5–5.5 g • cm

Back Tension

(0.021–0.076 oz • inch)

more than 60 g • cm

FF

CQ-201B

(more than 0.83 oz • inch)

more than 60 g • cm

REW

CQ-201B

(more than 0.83 oz • inch)

FWD

CQ-403A

more than 100 g

REV

CQ-403R

(more than 3.53 oz)

TAPE

SPEED

ADJ