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– 17 –

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. Chuck the disc (YEDS-18) beforehand, and disconnect the power

cord from the outlet.

2. Connect oscilloscope to test point TP (FE1) on BD board.
3. Connect test point TP1 (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 be-

tween 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, remove the lead wire connected in step 3.
Note : • 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 bright-

ness to obtain best waveform.

Adjustment Location: BD board

Note: 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 test point TP1 (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 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

8. Press the  GROUP 8  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 7.

Traverse waveform

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch 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.

oscilloscope

BD board

TP (FE1)
TP (VC)

symmetry

A

B

Within 3 

±

 1 Vp-p

oscilloscope

BD board

TP (RF)
TP (VC)

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

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

9. Disconnect the lead wire of TP1 (ADJ) connected in step 2.

Adjustment Location: MAIN board

– 18 –

1. Connect the oscilloscope to Pins 1, 2, and 3 of CN506 of the

MAIN board.

2. Check that no discs are loaded in the unit.
3. With the power ON, while pressing the  GROUP 5  and

§ OPEN/CLOSE  buttons, press the  +100  button. The disc

table starts to rotate in the clockwise direction.

4. Loosen the fixing screw, move the mounting board (SENSOR),

and secure the mounting board (SENSOR) at the point the H
portion of the P.T waveform comes the center of the H portion
of the D.S waveform.

Be sure to perform this adjustment after sensor adjustment in ME-
CHANICAL ADJUSTMENT.

5. Rotate the  DISC/CHARACTER  knob in the counterclockwise

direction and the disc table starts to rotate in the same direction.
Check that the waveform at this time is the same as that in step
4. If larger by a considerable extent, rotate the  DISC/CHAR-
ACTER  knob in the clockwise direction and the disc table starts
to rotate in the same direction. Repeat from step 4.

6. Rotate RV501 of the MAIN board and adjust so that the H and L

portions of the D.S waveform become the same.

Fixing screw

Mounting board (SENSOR)

D.S: Pin 

1

T.P: Pin 

3

GND: Pin 

2

oscilloscope

D.S
GND
T.P

MAIN board

CN506

D.S

P.T

D.S

P.T

Should be at the center

D.S

Adjust so that these widths
become the same.

Adjustment Location: MAIN board

– 19 –

[ BD BOARD ] – Side B –

IC102

IC103

TP

(RF)

TP

(FE1)

TP

(TE)

TP

(VC)

[ MAIN BOARD ] – Component Side –

RV501

DISC SENSOR 

ADJUSTMENT

1

3

CN506

TP2 (AFADJ) R516

TP1 (ADJ)

R517

1

44

34

33

23
22

12 11

IC502

– 20 –

MAIN board

JACK board

POWER board

LED board

T . SENS board

D . SENS (OUT) board

D . SENS (IN) board

D . SW board

D . MOTOR board

JOG board

SW board

SW 2 board

L.T. MOTOR board

BD board

DISPLAY board

KEY board