Sony Ericsson CDP-CX220 User Manual

– 19 –

A clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Connect the test point TP (ADJ) on MAIN board to the ground

with a lead wire.

3. Turn the

I/

u button on to set the ADJ mode.

4. Put disc (YEDS-18) in to play the number five track.
5. Press the 

[GROUP 3]

 button. (The tracking servo and the sled-

ding servo are turned OFF.)

6. 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 ± 22%

7. Press the 

[GROUP 8]

 button. (The tracking servo and sled-

ding servo are turned ON.)  Confirm the C (DC voltage) is
almost equal to the A (DC voltage) is step 6.

8. Disconnect the lead wire of TP (ADJ) connected in step 1.

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 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 test point TP (FE1) on BD board.
2. Connect test point TP (ADJ) on MAIN board to ground with

lead wire.

3. Turn

I/

u button on to set the ADJ mode.

4. Put disc (YEDS-18) in and playback.

Press the 

[CHECK]

 button.

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

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

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

• 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 test point TP (RFO) on BD board.
2. Turn

I/

u button on.

3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

BD board

TP (FE1)
TP (VC)

+
–

oscilloscope

S-curve waveform

symmetry

A

B

within 3 

±

 1 Vp-p

BD board

TP (RFO)
TP (VC)

+
–

oscilloscope

(AC range)

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

level: 1.2         Vp-p

RF signal waveform

+0.25
–0.20

BD board

TP (TE)
TP (VC)

+
–

oscilloscope

Traverse waveform

Center of the waveform

B

A (DC voltage)

level: 1.3 

±

 0.6 Vp-p

0 V

Traverse waveform

C (DC
voltage)

0 V

Tracking servo 
Sled servo
        OFF

Tracking servo 
Sled servo
        ON