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– 13 –

7. Move the holder (sensor) center so that the flat portion center at the top of the SENS (CH1) input waveform and the ‘’H” center of

TEST (CH2) coincide.

8. Tighten the fixed screw to fix the disc table, then press the 

[CLEAR]

 button.

9. The disc table rotates in the counterclockwise direction.  Measure the waveform and make sure that the flat portion center at the top of

the SENS (CH1) input waveform and the ‘’H” center of TEST (CH2) coincide.

10. If the adjustment is not successful, press the 

[CLEAR]

 button to rotate the disc table in the clockwise direction,

and perform steps 6 to 9.

During the adjustment mode, the rotational direction is switched each time the 

[CLEAR]

 button is pressed.

Pressing the 

[CHECK]

 button enters the loading mode which will be described later. Pressing the 

[CLEAR]

 button rotates the disc table again.

TEST (CH2) waveform

SENS (CH1) waveform

Flat portion center of
SENS (CH1) waveform

Holder (sensor)

Fixed screw

– 14 –

1. Check that there is no disc in the unit and then turn ON the power.  Open the door, and set a disc in the PLUS ONE slit.
2. Turn OFF the power, close the door, and while pressing the

[CLEAR]

and [PLUS ONE] buttons simultaneously, turn ON the power

again.

3. Press the

[CHECK]

button, and set the loading mode.

4. Press the

±

button and chuck the disc.

5. Adjust the magnet assembly and magnet holder so that A=B as shown in the figure.

1. Check that there is no disc in the unit and then turn ON the power.  Open the door, and set a disc in the PLUS ONE slit.
2. Turn OFF the power, close the door, and while pressing the

[CLEAR]

and

[PLUS ONE]

buttons simultaneously, turn ON the power

again.

3. Press the

[CHECK]

button, and set the loading mode.

4. Press the

±

button and chuck the disc.

5. Press

≠

or

±

button to stop the disc holder A slightly away from the disc.

6. Rotate and adjust the adjusting screw so that the center of the disc and that of the disc holder coincide.

Magnet ASSY

Magnet ASSY

Magnet holder

Screw (For adjustment)

A   B

Disc

Disc

Disc holder A

Disc holder A

a  b

a = b

Screw (For adjustment)

– 15 –

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 fol-
lowing checks.

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 be-

tween A and B. And confirm peak to peak level within 1.8 

±

0.6 Vp-p.

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

step 7.

• 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. 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.

10. Confirm that oscilloscope waveform is clear and check RF sig-

nal level is correct or not.

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

step 7.

A clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.

The procedure for this checking method differs for when a general
remote control unit is used and not used.

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%

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.

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

step 7.

BD board

TP (FE)

TP (VC)

+
–

oscilloscope

symmetry

within 1.8 

±

 0.6Vp-p

A

B

S-curve waveforms

BD board

TP (RF)

TP (VC)

+
–

oscilloscope

(AC range)

level :  1.6 

±

0.3

 

Vp-p

0.2

 

VOLT/DIV :  200mV
TIME/DIV :  500ns

RF signal waveform

BD board

TP (TE)

TP (VC)

+
–

oscilloscope

Center of the waveform

level :  1.3 

±

 0.5 Vp-p

A (DC voltage)

B 

0 V 

Traverse waveform

C (DC
voltage)

Tracking servo 
Sled servo
           ON

Tracking servo 
Sled servo
          OFF

Traverse waveform

0 V

– 16 –

When a general remote commander is not used:
1. Solder lead wires to TP (DVDD) and TP (TOFF) on the BD

board severally.

2. Connect the oscilloscope to TP (TE) of the BD board.
3. Press the

I

/

u

button and turn ON the power supply.

4. Open the front cover, and press the

[PLUS ONE]

button.

5. Set the disc (YEDS-18) into the “PLUS ONE” slit.
6. Close the front cover, and chuck the disc.
7. Playback the fifth track of the disc.
8. Short-circuit the lead wire connected at step 1. (The tracking

servo is turned OFF)

9. 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%

10. Disconnect the lead wire short-circuited at step 8. (The track-

ing servo is turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 8.

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

step 1.

Procedure :
1. Connect the frequency counter to TP (PCK) of the BD board.

2. Press the

I

/

u

button and turn ON the power supply.

3. Open the front cover, and press the 

[PLUS ONE]

 button.

4. Set the disc (YEDS-18) into the “PLUS ONE” slit.
5. Close the front cover, and chuck the disc.
6. Playback the fifth track of the disc.
7. Confirm that reading on frequency counter is 4.3218 MHz 

±

30 kHz.

RV502 of the AUDIO board requires no adjustments. Please note
that it should be dixed to mechanical center position when you
moved and do not know origin position.

[ BD BOARD ] — CONDUCTOR SIDE —

[ DISPLAY BOARD ] — CONDUCTOR SIDE —

[ AUDIO BOARD ] — COMPONENT SIDE —

frequency counter

BD board

TP (PCK)

C (DC
voltage)

Tracking servo 
           ON

Tracking servo 
          OFF

Traverse waveform

0 V

CNP801

IC801

CNP804

TP

(ADJ)

IC102

TP

(TOFF)

TP

(DVDD)

TP

(PCK)

TP

(RF)

TP

(TE)

TP

(FE)

TP

(VC)

CN101

CN103

CN102

IC101

BD board

TP (FE)

TP (VC)

+
–

oscilloscope

T501

NO503

CN841

CN801

CN811

CN501

RV502 (No Adjustment)

Center of the waveform

level :  1.3 

±

 0.5 Vp-p

A (DC voltage)

B 

0 V 

Traverse waveform