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13

For the mechanism deck check mode, two modes of disc table mode and loading mode are available.
In the mechanism deck check mode, the disc table turning time and the loading time in each section are measured and displayed.

1. Disc table mode:

Press the 

[POWER]

 switch while pressing 

[CHECK]

, 

[    OPEN/CLOSE]

 and  

[REPEAT]

 buttons simultaneously.

Loading mode:
Press the 

[POWER]

 switch while pressing 

[CHECK]

, 

[    OPEN/CLOSE]

 and  

[TIME]

 buttons simultaneously.

A

A

Display contents

Mode

Check command

Display

Disc table mode

0: Right one turn

r 12.5

Table turning

1: Left one Turn

L 10.2

(

 time measurement 

)

2: Measurement end

r 12.5

3: Undefined

4: Star position

Sta

– –.–

5: Open 

→

 Close

CLo 10.2

6: Close 

→

 BU up

UP

0.7

Table mode

7: BU up 

→

 EX open

EoP

6.2

Loading time

8: EX open 

→

 EX close

ECL 10.3

(

 measurement 

)

9: EX close 

→

 BU down

don

1.2

A: BU down 

→

 Open

oPn

9.3

FF: Measurement end

CLo 10.2

14

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) on the BD board.
2. Connect between TP (FE1) and TP (VC) with lead wire.
3. Connect between TP (AGCCON) and TP  (GND)  with lead

wire.

4. Turned power switch (

[POWER]

 button) 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) on BD board.
2. Connect between TP (AGCCON) and TP (GND) with lead

wire.

3. Turned power switch (

[POWER]

 button) on.

4. Load a disc (YEDS-18) and playback.
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 oscilloscope to TP (TE) and TP (VC) on BD board.
2. Turned power switch (

[POWER]

 button) on.

3. Load a disc (YEDS-18) and playback the number five track.
4. Press the

H

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.

Procedure :
1. Connect frequency counter to TP (PLCK) with lead wire.

2. Turned power switch (

[POWER]

 button) on.

3. Put the disc (YEDS-18) in to play the number five track.

Confirm that reading on frequency counter is 4.3218 MHz.

A
B

±

±

±

15

16

MEMO