CDP-CX333ES, CDP-CX555ES - Sony Audio Service Manual (repair manual). Page 19

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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 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 fol-
lowing checks.

Procedure :
1. Chuck the disc (YEDS-18) beforehand, and remove the power

cord from the outlet.

2. Connect oscilloscope to test point TP (FE1) on BD board.
3. Connect  ^¡ pin of IC501 (ADJ) on MAIN board to ground

with lead wire.

4. The ADJ mode is set when the power cord is inserted into the

outlet and power is supplied.

5. The fifth track is played automatically.
6. Press the 

[CHECK]

 button.

7. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within
3±1 Vp-p.

S-curve waveform

8. Pressing the

1/

u

button stops the output of the waveform

(s curve).

9. After check, disconnect the lead wire connected in step 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.

Adjustment Location: BD board

Procedure :
1. Connect oscilloscope to test point TP (RFO) on BD board.
2. Turn Power ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

oscilloscope

BD board

TP (FE1)
TP (VC)

symmetry

A

B

Within 3 

±

 1 Vp-p

oscilloscope

BD board

TP (RFO)
TP (VC)

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

RF signal waveform

Adjustment Location: BD board

Procedure :
1. Chuck the disc (YEDS-18) beforehand, and disconnect the

power cord from the outlet.

2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Connect  ^¡ pin of IC501 (ADJ) on MAIN board to ground

with lead wire.

4. The ADJ mode is set when the power cord is inserted into the

outlet and power is supplied.

5. The fifth track is played automatically.
6. Press the 

[GROUP 3]

 button. (The tracking servo and the sled-

ding servo are turned OFF.)

7. Check the level B of the oscilliscopes waveform and the A

(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%

Traverse waveform

8. Press the 

[GROUP 8]

 button. (The tracking servo and sled-

ding servo are turned ON.) Confirm the C (DC voltage) is al-
most equal to the A (DC voltage) is step 7.

Traverse waveform

9. Disconnect the lead wire connected in step 3.

Adjustment Location: MAIN board

VOLT/DIV: 200 mV
TIME/DIV: 500 ns

level: 1.2         Vp-p

+0.25
–0.20

oscilloscope

BD board

TP (TE)
TP (VC)

0V

level : 1.3 

±

 0.6 mVp-p

A (DC voltage)

Center of the waveform

B

0V

C (DC 
voltage)

Tracking servo
Sledding servo
        OFF

Tracking servo
Sledding servo
        ON