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17

1.

Turn on the power and set the dick to number 24.

2.

With the power ON, while pressing the  GROUP FILE  and
MEGA CTRL  buttons, press the

I

/

1

button to enter the

Adjastment mode.

3.

Rotate the JOG dial and select the mechanism adjustment mode.
(“Mech Adjust” is displayed.)
Press the JOG dial.

4.

Keep pressing the  GROUP 1  button to operate the loading
mechanism, and continue pressing until the disc table locks.
(Fig-1)

5.

Keep pressing the  GROUP 2  button to raise the pop up part.

6.

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

At this position,this 
part will be locked.

lever (POP-UP 400)

Fix to the center so that the
lever (POP-UP 400) does 
not touch the slit.

cover (chassis 400)

18

1.

Enter the adjustment mode and select “Mech Adjust” with the
DISC/CHARACTER knob rotate, and press the knob.

2.

Press the  GROUP 1  button to operate the loading mechanism,
and continue pressing until the disc table locks. (Fig-3)

3.

Loosen the fixing screw and move the holder so that
both

H

button LED (green) and the ARTIST MODE button

LED (green) light.
If the holder is not in the correct position, the MEGA
CTRL button LED (orange) or the

X

button LED (orange)

lights.

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)

MEGA CTRL

ARTIST MODE

holder (table sensor 400)

S tight,  screw 
(PTTWH 3 

×

 6)

swing

table (400ES) ass'y

At this position,this 
part will be locked.

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 TP4 (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

I

/

1

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

(DC range)

BD board

TP (FE1)
TP (VC)

±

oscilloscope

(AC range)

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 TP4 (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

oscilloscope

(DC range)

BD board

TP (TE)
TP (VC)

±

s

20

S tight,  screw 
(PTTWH 3 

×

 6)

D. SENS (OUT) board

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

1. Connect the oscilloscope to Pins 1, 2, and 3 of TP1 of the

MAIN board.

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

[GROUP FILE]

 and

[MEGA CTRL]

 buttons, press the 

I

/

1

 button. Rotate the 

[DISC/

CHARCTER]

 knob, select “Table Rotation” and press the knob.

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

(DC range)

T.P
GND
D.S

MAIN board

TP1

D.S

T.P

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

D.S

T.P

Should be at the center