SRF-M55 - Sony Audio Service Manual (repair manual). Page 5

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Procedure :
1. Connect the frequency counter to TP (19kHz).
2. Turn the set to 98MHz.
3. Adjust RV1 for 19kHz reading frequency counter.

Standard Value : 18.9 –19.1kHz

Connection:
For FM frequency coverage adjustment

•

Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

Adjust for a maximum reading on level meter.

T1

10.7MHz

Adjust for a maximum reading on level meter.

CT2

87.5MHz

adjustment value: 2V

standard value: 1.5 – 2.5V

Confirm

108.0MHz

standard value: 9 – 13V

Adjust for a maximum reading on level meter.

CT1

98MHz

FM RF signal
generator

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

TP (ANT)

0.01

µ

F

set

16 

Ω

headphones jack EP1 (

i

)

level meter

FM RF signal
generator

Carrier frequency : 98MHz
Modulation : 1kHz, 22.5kHz deviation
Output level : 1mV (more than 60dB)

TP (ANT)

0.01

µ

F

1-676-002-

C

C101

C102

R106

R105

R109

R119

R120

R111

R107

R102

R108

R101

R104

R103

R

C103

C124

C105

C104

C125

Q

CF1

BPF101

CF2

D101

D102

B E

C

BCE

Q104

Q101

Q105

ECB

TP

(ANT)

TP

(LPF)

digital 

voltmeter

TP

(ANT)

[MAIN BOARD] 
(SIDE A)

TP (LPF)

1

5

13
15

20

24

10

12

IC101

C114

C115

C113

C

109

C

108

R121

R115

1

12

R113

R114

C111

C110

C107

C116

C112

CF3

TP

(19kHz)

frequency counter

TP (19kHz)

1

µ

F/50V

[MAIN BOARD] (SIDE A)

0 dB=1

µ

V

CT2 : FM Frequency Coverage
         Adjustment

CT1 : FM Tracking Adjustment

T1 : FM IF Adjustment

RV1 : FM Stereo (19kHz) Adjustment

[MAIN BOARD] (SIDE A)