DOWNLOAD Sony CDP-XB720 / CDP-XB720E Service Manual ↓ Size: 4.13 MB | Pages: 41 in PDF or view online for FREE

– 9 –

0

1

2

3

4

5

6

Load in

Access to TOC

Access to last track

Playback of last track

(3 seconds)

Access to first track

Playback of first track

(3 seconds)

Load out

AGING-0

AGING-1

AGING-2

Counter display

AGING-4

Counter display

AGING-6

ERROR-0

ERROR-1

ERROR-2

ERROR-3

ERROR-4

ERROR-5

ERROR-6

Code

No.

State

Display when

normal

Display when

abnormal

This unit is equipped with an aging mode to check operations of the
mechanism deck.
• When faults occur:
Aging stops, and the state when aging stopped is displayed on the
fluorescent display tube.

• When no fault has occurred:
Aging is continued repeatedly.

Aging method 1
(When using the aging mode remote controller (J-2501-123-A)):
1. Press the  

1/u  button and turn ON the power.

2. Set the disc on the tray.
3. Press the  AGING START  button of the aging remote controller.
4. Aging starts and the message shown in Fig. 1 is displayed on the

fluorescent display tube.

5. To end, press the  

1/u  button.

Aging method 2 (When no aging mode remote controller):
1. Press the  

1/u  button and turn ON the power.

2. Set the disc on the tray.
3. Press the  

§ OPEN/CLOSE  button,  p  button, and  MUSIC

SCAN  button at the same time. (If these buttons are not pressed
at the same time, nothing performs.)

4. Aging starts and the message shown in Fig. 1 is displayed on the

fluorescent display tube.

5. To end, press the  

1/u  button.

[ MAIN BOARD ] – Component Side –

CN302

JW003
(ADJ)

JW004
(AFADJ)

– 10 –

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

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 (FE) on BD board.
2. Connect the test point JW003 (ADJ) on MAIN board to the

ground with a lead wire.

3. Turn ON the power.
4. Put disc (YEDS-18) in press  

·  (play) button.

5. When the  11  button of the remote commander is pressed, the S

curve will be output continuously.

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

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

S-curve waveform

7. 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.

oscilloscope

BD board

TP (FE)
TP (VC)

+ 1.5
– 1

symmetry

A

B

Within 3        Vp-p

+ 1.5
– 1

oscilloscope

BD board

TP (FE)
TP (VC)

symmetry

A

B

Within 3.8 

±

 1.1 Vp-p

Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Connect both ends of TP R151 of the BD board to the lead wire.
4. Turn ON the power.
5. Put disc (YEDS-18) in and actuate the focus search. (actuate the

focus search when disc table is moving in and out.)

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

between A and B. And confirm peak to peak level within 3.8 ± 1
Vp-p.

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.

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

level : 1.2 

±

 0.2 Vp-p

oscilloscope

BD board

TP (TE)
TP (VC)

S-curve waveform

oscilloscope

BD board

TP (RF)
TP (VC)

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn ON the power.
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.

A clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.

       RF signal waveform

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turn ON the power.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the  

P  (Pause) button. (Becomes the 1 track jump mode)

5. 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%

– 11 –

Procedure :
1. Connect the test point JW003 (ADJ) on MAIN board to the

ground with a lead wire on main board.

2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turn ON the power and to set the ADJ mode.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the 4 button. (The tracking servo and the sledding 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%

Traverse waveform

oscilloscope

BD board

TP (TE)
TP (VC)

[ BD BOARD ] – Side A –

[ MAIN BOARD ] – Component Side –

0V

level :  1.3 

±

 0.6 Vp-p

A (DC voltage)

Center of the waveform

B

7. Press the 9 button. (The tracking servo and sledding servo are

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

Traverse waveform

0V

C (DC 
voltage)

Tracking servo

Sledding servo 

OFF

Tracking servo
Sledding servo
        ON

8. Disconnect the lead wire of JW003 (ADJ) connected in step 1.

CN102

IC101

TP(FEI)

TP(VC)

TP(IOP)

TP(RF)

TP(TE)

TP(FE)

TP

(R151)

0V

level : 1.3       Vp-p

A (DC voltage)

Center of the waveform

B

symmetry

+ 0.7
– 0.6

     1 track jump waveform

CN302

JW003
(ADJ)

JW004
(AFADJ)

– 12 –

BD board

MAIN board

LOADING board

PANEL board

DF board

HP board
(AEP)

SW board

POWER board