HCD-LV60, LBT-LV60KR - Sony Audio Service Manual (repair manual). Page 15

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Procedure:
1. Connect the frequency counter to TP508 (27 MHz) on VIDEO

board.

2. Turn the power ON.
3. Press the 

[FUNCTION]

 button to select the CD.

4. Adjust CT503 on the VIDEO board so that the frequency

counter reading 27.0 MHz ± 80 Hz at stop status.

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

fore, 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 10 M

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 (FE) and TP (VC).
2. Connect between TP (FE1) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP  (GND)  by lead wire.
4. Turn the power ON.
5. Load a disc (YEDS-18) and actuate the focus search. (In con-

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

6. Cofirm that the oscilloscope waveform (S-curve) is symmetri-

cal between A and B.  And confirm peak to peak level within
4 ± 1 Vp-p.

S-curve waveform

7. After check, remove the lead wire connected in step 2 and 3.

• 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 (RF) and TP (VC).
2. Connect between TP (AGCCON) and TP (GND) by lead wire.
3. Turn the power ON.
4. Load a disc (YEDS-18) and press the

G

 

X

button to play.

5. Confirm that the oscilloscope waveform is clear and check RF

signal level is correct or not.

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

Clear RF signal waveform means that the shape “ ” can be clearly
distinguished at the center of the waveform.

±

±

Procedure :
1. Connect oscilloscpe to TP (TE) and TP (VC).
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the

G

 

X

button. (Becomes the 1 track jump mode)

5. Confirm that the level B and A (DC voltage) on the oscillo-

scope waveform.

1 track jump waveform

Specified level:          

×

 100 = less than ± 22%

6. After check, remove the lead wire connected in step 1.

A
B

±