HCD-VP700 - Sony Audio Service Manual (repair manual). Page 19

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Procedure:
1.

Supply a 28 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Adjust RV11 to the point (moment) when the TUNED indicator
will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 25 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 22 and pin 3 of IC 11.  Adjust
T11 ubtil the voltage becomes 0 V.

Adjustment Location: MAIN board

FM RF SSG

75 

Ω

 coaxial

Carrier frequency : 98 MHz
Modulation           : AUDIO 1 kHz, 75 kHz
                              deviation (100%)
Output level          : 28 dB  (at 75 

Ω

 open)

FM ANTENNA terminal
(TM1)

set

Ω coaxial

Ω open)

CN301

RV354

RV304

RV351

CN304

T11

RV11

IC11

12

1

13

24

RV302

RV301

RV303

NULL

FM TUNED LEVEL

Note :

1. CD Block is basically designed to operate without adjustment.

Therefore, check each item in order given.

2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M

Ω impedance.

4. Clean the object lens by an applicator with neutral detergent

when the signal level is low than specified value with the
following checks.

Procedure :
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FE) and TP (DVC) by lead wire.
3. Turn Power switch on.
4. Load a disc (YEDS-18) and actuate the focus search. (In

consequence of open and close the disc tray, actuate the focus
search)

5. Confirm that the oscilloscope waveform (S-curve) is

symmetrical between A and B. And confirm peak to peak level
within 4 

±1 Vp-p.

7. After check, remove the lead wire connected in step 2.

Note :

• Try to measure several times to make sure than the ratio

of A : B or B : A is more than 10 : 7.

• Take sweep time as long as possible and light up the

brightness to obtain best waveform.

Procedure :
1. Connect oscilloscope to TP (RFAC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

5. Measure the RFDC in the same way.

symmetry

S-curve waveform

within 4 

±

1Vp-p

A

B

TP(RFAC)
TP(DVC)

BD board

oscilloscope

BD board

Oscilloscope

TP(FE)
TP(DVC)