HCD-VX777 - Sony Audio Service Manual (repair manual). Page 17

17

Procedure:
1.

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

2.

Tune the set to 98 MHz.

3.

Adjust RV611 to the point (moment) when the TUNED
indicator will change from going off to going on.

Adjustment Location: MAIN board

Procedure:
1.

Supply a 60 dB 98 MHz signal from the ANTENNA terminal.

2.

Tune the set to 98 MHz.

3.

Measure voltage between pin 21 of IC 601.  Adjust T11 ubtil
the voltage becomes 0 V.

Adjustment Location: MAIN board

Ω

Ω

Note :

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

Therefore, check each item in order given.

2. Use LUV-P01 (4-999-032-01) 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 (FEI) and TP (DVC (    1.65 V) by lead

wire.

3. Turn Power switch on.
4. Load a disc (LUV-P01) 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 2 ±0.5 Vp-p.

6. 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 (RFDC) and (RFAC).
2. Turned Power switch on.
3. Load a disc (LUV-P01) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

±

RV354

CN303

CN301

CN304

RV304

RV301

RV352
RV302

RV353

RV303

RV351

RV11

T11

1

3