CFS-616S - Sony Audio Service Manual (repair manual). Page 9

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0 dB=0.775 V

1. The adjustments should be performed in the order given in the

service manual. (As a general rule. Playback circuit adjust-
ment should be completed before performing recording cir-
cuit adjustment.)

2. The adjustments should be performed for both L-ch and R-ch

unless otherwise indicated.

•

Switch and control position
FUNCTION switch ............................. TAPE (RADIO OFF)
BALANCE control ............................. center click
MEGA BASS control ......................... mechanical center
BALANCE control ............................. center click
PRESET MODE switch ...................... MANUAL
VOLUME control ............................... maximum

Procedure:
Mode: FWD/REV playback (DECK A)

FWD playback (DECK B)

1. Set playback mode (normal speed).
2. Make sure that the value indicated on the frequency counter

falls into the specification.

3. If out of specification, adjust RV303 so that the value on the

frequency counter becomes 3 kHz.

Specifications: 2,985 to 3,015 Hz

4. Adjust so that the frequency at the beginning and that at the

end of tape winding are between 2,970 and 3,030 Hz.

5. Set high speed dubbing mode.
6. Confirm so that the value on the frequency counter is between

5,300 and 6,300 Hz.

7. Confirm frequency difference the beginning and the end of

the tape should be within 1%.

Adjustment Location: MAIN board (See page 11)

SP Out

Phones

Load impedance

6 

Ω

32 

Ω

Output  level

0.775 V (0 dB)

0.25 V (–10 dB)

Type

Signal

Used for

WS-48B

3 kHz, 0 dB

Tape speed adjustment

+

–

set

32 

Ω

frequency 
counter

PHONES jack (J301)

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

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

swab:

record/playback head

pinch rollers

playback head

rubber belts

erase head

idlers

capstan

2. Demagnetize the record/playback head with a head demagne-

tizer. (Do not bring the head demagnetizer 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.

Mode

Torque Meter

Meter Reading

Playback

CQ-102C

30 – 75 g•cm

(0.42 – 1.04 oz•inch)

Back tension

CQ-102C

1.5 – 6.0 g•cm

(0.021 – 0.083 oz•inch)

Rewind

Deck-A: More than 60 g•cm

CQ-201B

(More than 0.84 oz•inch)

Fast forward

Deck B: More than 50 g•cm

(More than 0.70 oz•inch)

Tension Meter

Meter Reading

CQ-403A

Deck-A: More than 90 g (3.18 oz)

Deck-B: More than 100 g (3.53 oz)