CFD-6 - Sony Audio Service Manual (repair manual). Page 9

– 9 –

Procedure :
1. Mode : playback

test tape
P-4-A063
(6.3kHz, –10dB)

set

33

Ω

J302 (phones)

level meter

+

–

L-CH
peak

R-CH
peak

L-CH
peak

R-CH
peak

Screw
position

output
level

within

2dB

within

2 dB

screw position

2. Turn the adjustment screw for the maximum output levels. If
   these levels do not match, turn the adjustment screw until both
   of output levels match together within 2dB. 

3. Phase Check

Mode : playback

L-CH

H

V

L-CH

set

33

Ω

R-CH

R-CH

33

Ω

in phase     45

°

        90

°

       135

°

      180

°

good

wrong

screen pattern

test tape
P-4-A063
(6.3kHz, –10dB)

J302 (phones)

oscilloscope

+
–

+

–

Adjustment Location : – record / playback head –

adjustment screw

REC/PB head

Function switch

: AM

Volume

: MAX

AM RF signal
generator

30% amplitude modulation by 400Hz
signal.
Output level : as low as possible

Put the lead-wire
antenna close to 
the set.

Function switch

: FM

Volume

: MAX

FM RF signal
generator

22.5kHz frequency deviation by 
400Hz signal.
Output level : as low as possible

telescopic
antenna
terminal

0.01  F

µ

set

33

Ω

+

–

J302 (phones)

level meter

r

Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.

no mark

: E, Central & South America model

 [        ]

: AEP, UK model

((       ))

: Italian model

 <       >

: East European model

           Adjust for a maximum reading on level meter.

CFT1

455kHz

[ 455kHz]

(( 455kHz))

< 455kHz>

           Adjust for a maximum reading on level meter.

L4

520kHz

[520kHz]

((516kHz))

<520kHz>

CT4

1,680kHz

[1,680kHz]

((1,630kHz)) <1,680kHz>

          Adjust for a maximum reading on level meter.

L3

620kHz

[620kHz]

((620kHz))

<620kHz>

CT3

1,400kHz

[1,400kHz]