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17

1. With the power ON, while pressing the  

[GROUP 4]

  and 

[     ]

buttons, press the 

[+100]

 button to enter the mechanism ad-

justment mode.

2. Press the 

[GROUP 1]

 button to operate the loading mecha-

nism, and continue pressing until the disc table locks. (Fig-1)

3. Press the 

[GROUP 2]

 button to raise the pop up part.

4. Remove the cover (chassis), loosen the adjusting screw, move

the screwdriver left and right until the lever (POP UP) does
not touch the slit wall, and secure the screw. (Fig-2)

The following buttons have special functions in this mode.

[GROUP 1]

 button: Loading mechanism IN operation

[GROUP 5]

 button: Loading mechanism OUT operation

[GROUP 2]

 button: Pop up part UP operation

[GROUP 6]

 button: Pop up part DOWN operation

 

·

GROUP 1
GROUP 2

GROUP 4

Lever (pop up)

Fix to the center so that the
lever (POP UP) does not
touch the slit.

Cover (chassis)

At this position,this 
part will be locked.

18

1. With the power ON, while pressing the 

[GROUP 4]

 and 

[     ]

buttons, press the 

[+100]

 button to enter the mechanism ad-

justment mode.

2. Press the 

[GROUP 1]

 button to operate the loading mecha-

nism, and continue pressing until the disc table locks. (Fig-3)

3. Loosen the fixing screw, move the holder (TABLE SENSOR)

slightly, and when the LED (green) of the 

[     ]

 button switches

to the LED (orange) of the 

[     ]

 button (or vice versa), secure

the holder (TABLE SENSOR). (Fig-4)

4. Moving the disc table right and left with a hand after the screw

is fixed, the table will move by the play of a disc table. If the
LEDs light up alternately, the adjustment will be performed
correctly. (Fig-4)

 

·

PLAY indicator

Linked with 

·

 indicator

Linked with 

P

 indicator

PAUSE indicator

GROUP 1

GROUP 4

PAUSE button

PLAY button

Fixed screws

Swing

Holder (table sensor)

Table assembly

At this position,this 
part will be locked.

 

·

 

P

19

[     ]

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 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 fol-
lowing checks.

Procedure :
1. Chuck the disc (YEDS-18) beforehand, and remove the power

cord from the outlet.

2. Connect oscilloscope to test point TP (FE1) on BD board.
3. Connect  ^¡ pin of IC501 (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

between 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, disconnect the lead wire connected in step 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.

Adjustment Location: BD board

Procedure :
1. Connect oscilloscope to test point TP (RFO) on BD board.
2. Turn Power ON.
3. Put disc (YEDS-18) in to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF

signal level is correct or not.

oscilloscope

BD board

TP (FE1)
TP (VC)

symmetry

A

B

Within 3 

±

 1 Vp-p

oscilloscope

BD board

TP (RFO)
TP (VC)

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  ^¡ pin of IC501 (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 oscilliscopes 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 sled-

ding servo are turned ON.) Confirm the C (DC voltage) is al-
most equal to the A (DC voltage) is step 7.

Traverse waveform

9. Disconnect the lead wire connected in step 3.

Adjustment Location: MAIN board

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

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

20

Be sure to perform this adjustment after sensor adjustment in
MECHANICAL ADJUSTMENT.

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.

T.P: Pin 

1

D.S: Pin 

3

GND: Pin 

2

oscilloscope

T.P
GND
D.S

MAIN board

CN506

D.S

P.T

5. Rotate the 

[DISC/CHARACTER]

 knob in the counterclock-

wise 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/CHARACTER]

 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.

Adjustment Location: MAIN board

Fixing screw

Mounting board (SENSOR)

D.S

P.T

Should be at the center

D.S

Adjust so that these widths
become the same.

TP

(RFO)

TP

(FE1)

TP

(TE)

IC101

IC103

TP

(VC)

1

CN506

RV501

3

§