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25

1.

Turn ON the power of the unit, set disc to disc table, and perform
chucking.

2.

Disconnect the power supply plug from the outlet.

3.

To set ADJ mode, connect the test point (ADJ) of the MAIN
board to Ground, and connect the power supply plug to the
outlet.

In this mode, table rotation and loading operations are not performed
because it is taken that the disc has already been chucked.

Note: The same operations are also performed in the following when

the test point (ADJ) is connected to Ground after turning on
the power.

• Direct search (movement of sledding motor) is not performed dur-

ing accessing

• Ignored even when GFS becomes L
• Ignored even when the Q data cannot be read
• Focus gain does not decrease

To set this mode, connect the test point (AFADJ) on the MAIN
board to Ground, and connect the power supply plug to the outlet.

Note: When this mode is executed, all title memos recorded will be

erased.

• When this button is pressed, “line # No. #” will be displayed.

However, these will not be displayed for the following special
buttons. However, these will not be displayed for the following
special buttons.

 

p  (stop) button: FL segment check

(Refer to FL Tube Check Patterns)

 

P  (pause) button: FL grid check

(Refer to FL Tube Check Patterns)
The  

P  LED also light up simultaneously.

 

·  (play) button: All FL segment and grid will light up.

All LEDs also light up simultaneously.

TIMER switch:

When the switch position is  PLAY , the
STANDBY  LED light up. It goes off when
set to OFF.

Each time this button is pressed, the value of the “Got ## keys”
increases. Buttons pressed once will not be counted when pressed
again.

Segment check

A    B    C    D    E    F    G

• When the jog dial is rotated to the right, the GROUP LEDs light

up in the order of 1

n2..8nHIT LISTnEASY PLAYnMEGA

CONTROL

n1.

• When the jog dial is rotated to the left, the GROUP LEDs light up

in the order of 8

n 7..1n MEGA CONTROLn EASY

PLAY

nHIT LISTn8.

• Abbreviation
  FL: Fluorescent Indicator Tube

[ MAIN BOARD ] – Cnductor Side –

Grid check

Button

CONTINUE

SHUFFLE

PROGRAM

GROUP 3 (3)

GROUP 8 (8)

CHECK

Function

Servo average display
Displays VC, FE, RF, TE and traverse in hexadecimal
numbers

Focus bias display

Each time this is pressed, the focus bias is switched
between (1) and (2)

(1)
Bias actually set     Optimum bias     Minimum jitter
(2)
U:Upper aliasing bias     L:Lower aliasing bias

Auto gain display

Displays focus, tracking, sledding in hexadecimal
numbers

Turns off the tracking and sledding servo

Turns on the tracking and sledding servo

S-curve observation mode.
(Exits this mode when the  

1/u  button is pressed.)

Magnified

TP (AFADJ)

TP (ADJ)

IC504

IC501

26

Pop Up Mechanism Adjustment
1.

With the power ON, while pressing the  GROUP 4  and 

·

buttons, press the  +100  button to enter the mechanism
adjustment mode.

2.

Press the  GROUP 1  button to operate the loading mechanism,
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

Lever (pop up)

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

Cover (chassis)

GROUP1
GROUP2

GROUP4

At this position,this 
part will be locked.

27

GROUP1

GROUP4

PAUSE button

PLAY button

Fixed screws

Swing

Holder (table sensor)

Table assembly

At this position,this 
part will be locked.

Sensor Adjustment
1.

With the power ON, while pressing the  GROUP 4  and 

·

buttons, press the  +100  button to enter the mechanism
adjustment mode.

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, move the holder (TABLE SENSOR)
slightly, and when the LED (green) of the  PLAY  button
switches to the LED (orange) of the  PAUSE  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

28

Note:
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 TP (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, 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

brightness to obtain best waveform.

Adjustment Location: BD board (See page 30)

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 (See page 30)

Procedure :
1.

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

2.

Connect oscilloscpe to test point TP (TE1) on BD board.

3.

Connect test point TP (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
sledding servo are turned OFF.) “ TRK Off ” is displayed.

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.) “ TRK On ” is displayed. 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 (RFAC) 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
signal level is correct or not.

oscilloscope

BD board

TP (FE1)
TP (VC)

symmetry

A

B

Within 3 

±

 1 Vp-p

VOLT/DIV : 1V
TIME/DIV : 400 

µ

s

oscilloscope

BD board

TP (RFAC)
TP (VC)

VOLT/DIV : 500mV
TIME/DIV : 1 

µ

s

level : 1.2         Vp-p

+0.25
–0.20

oscilloscope

BD board

TP (TE1)
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.

After check, disconnect the lead wire of TP (ADJ) connected
in step 3.

Adjustment Location: MAIN board (See page 30)