CFT-22 - Sony Audio Service Manual (repair manual). Page 7

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1. Clean the following parts with a denatured-alcohol-moistened

swab :

playback head

pinch roller

rubber belts

capstan

2. Demagnetize the playback head with a head demagnetizer.
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 (6V) unless otherwise noted.

Mode

Torque meter

Meter reading

FWD

CQ-102C

20-42 g • cm

(0.28-0.58 oz • inch)

FWD 

less than 2 g • cm

Back Tension

(less than 0.03 oz • inch)

REV

CQ-102RC

20-42 g • cm

(0.28-0.58 oz • inch)

REV

less than 2 g • cm

Back Tension

(less than 0.03 oz • inch)

FF, REW

CQ-201B

more than 50 g • cm

(more than 0.69 oz • inch)

r

Supplied voltage : 6V

Ouput terminal

EARPHONE

load impedance

32

Ω

output signal level

0.14V (–15dB)

r

Type

Signal

Used for

WS-48A

3kHz, 0dB

Tape Speed Adjustment

Mode : Playback

set

+

–

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

32

Ω

speed checker
LFM-30 or
digital frequency
counter

earphone jack

1. Playback WS-48A (tape center portion) in reverse mode.

Adjust the RV401 so that the frequency counter reads
2,985Hz

±

10Hz.

RV401

adjustor (7-721-052-82)