SONY CDPCX53
Service Manual

SECTION 6 ELECTRICAL ADJUSTMENTS
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� 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. S Curve Check
oscilloscope BD board TP (FE) TP (VC) + �

10. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. 11. Turn OFF the power, and remove the lead wire connected at step 7.
Note: A clear RF signal waveform means that the shape ��� can be clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.6 ± 0.3 Vp-p
0.2

Procedure : 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. Close the front cover, and chuck the disc. 5. Press the I/u button and turn OFF the power. 6. Connect the oscilloscope to TP (FE) of the BD board. 7. Connect TP (ADJ) of the DISPLAY board and the ground with a lead wire. 8. Press the I/u button and turn ON the power. 9. The first track will be played back automatically. When the [CHECK] button is pressed, �S JI� will be displayed on the fluorescent indicator tube, and focus search will be repeated. 10. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 1.8 ± 0.6 Vp-p.
S-curve waveforms symmetry

E-F Balance (Traverse) Check The procedure for this checking method differs for when a general remote control unit is used and not used.
oscilloscope BD board TP (TE) TP (VC) + �

A B

within 1.8 ± 0.6Vp-p

When a general remote commander is used: 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. Close the front cover, and chuck the disc. 5. Press the I/u button and turn OFF the power. 6. Connect the oscilloscope to TP (TE) of the BD board. 7. Connect TP (ADJ) of the DISPLAY board and the ground with a lead wire. 8. Press the I/u button and turn ON the power. 9. Playback the fifth track of the disc. 10. Press the [3] button on the remote commander. (The tracking servo and the sledding servo are turned OFF.) 11. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 10%
Traverse waveform Center of the waveform

11. Turn OFF the power, and remove the lead wire connected at step 7.
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.

B A (DC voltage) 0V

RF Level Check
oscilloscope (AC range) BD board TP (RF) TP (VC) + �

level : 1.3 ± 0.5 Vp-p

12. Press the [8] button on the remote control unit. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 11.
Traverse waveform

Procedure : 1. Press the I/u button and turn ON the power supply. 2. Open the front cover, and press the [PLUS ONE] button. 3. Set the disc (YEDS-18) into the �PLUS ONE� slit. 4. Close the front cover, and chuck the disc. 5. Press the I/u button and turn OFF the power. 6. Connect the oscilloscope to TP (RF) of the BD board. 7. Connect TP (ADJ) of the DISPLAY board and the ground with a lead wire. 8. Press the I/u button and turn ON the power. 9. Playback the fifth track of the disc.

0V

C (DC voltage)

Tracking servo Sled servo OFF

Tracking servo Sled servo ON

13. Turn OFF the power, and remove the lead wire connected at step 7.

� 15 �