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— 5 —

 Follow the disassembly procedure in the numerical order given.

• In order to remove the front panel block when the power supply

does not turn on, rotate the cam with tapering driver as the figure
shows, and the loading part will be moved.
Then pull out the loading part by your hand to remove the load-
ing panel as the figure shows. After that take out the front panel
block.

Tapering driver

Loading part

Loading panel

1

Turn the cam to the direction of ar-
row (counter clock wise)
by tapering driver.

BU-5BD22

2

Take off the disc table.

3

 Yoke bracket

4

Remove the Base unit
(BU-5BD22) to the direction
of arrow.

— 6 —

The following checks can be performed in the AF mode, which is
set by connecting the TP2 (AFADJ) terminal on MAIN
board to the Ground and turning on the power.

After all segments light up, when the 

· button is pressed, the

following will be displayed. (Partial lighting 1)

When the 

p button is pressed, the following will be displayed.

(partial lighting 2)

The display will light up as follows (partial lighting 3) when the
≠ AMS ± knob is rotated to the right, and as follows (par-
tial lighting 4) when rotated to the left.

CHECK

)

0

P

ENTER

CLEAR

MUSIC SCAN

PEAK SEARCH

EDIT/

TIME FADE

PLAY MODE

REPEAT

TIME

OPEN/

CLOSE 

§

PLAY 

·

STOP 

p

12

13

14

All lit

Partial lighting 1

Partial lighting 2

Button

Button No.

Displayed

0

1

2

4

6

7

9

10

11

Button

Button No.

Displayed

When buttons other than the 

· button are pressed when the

whole display is lit, the display will change to partial lighting 2.
When the “

·” button is pressed, the display will light up as

follows.

REMOCON PLAY

(Partial lighting 5)

When the OPEN/CLOSE 

§ button is pressed, all will light up

again.

All buttons have corresponding button numbers. When a button
is pressed, the counter will count up and display the button’s num-
ber. However, the counter will only count to “15”. It will not count
for buttons already pressed once, but will display the button’s
number.

88

 

TOTAL

= 

88

Â

Â

Display of button number

Display of counting

A B C D E F

(Partial lighting 1)

(Partial lighting 2)

JOG RIGHT

JOG LEFT

(Partial lighting 4)

(Partial lighting 3)

— 7 —

[ MAIN BOARD ] — Component Side —

IC631

TP2 (AFADJ)

R622

TP1 (ADJ)

IC621

CN621

The following operations are performed in the ADJ mode, which
is set by connecting the TP1 (ADJ) terminal to the Ground and
turning on the power.

• During playback, there is no problem even if the GFS is continu-

ously LOW.

• High speed search is prohibited during access.
• During playback, the gain of focus servo and spindle servo does

not decrease.

• Servo related manual operations and measurement can be

performed.
(For details of operations, refer to Table of Button Operrations in
ADJ Mode.)

The jitter value display mode can be set after the all-music
remaining number mode using the TIME button.

The functions of the number buttons are shown in the following
table.

1

2

3

4

5

6

7

8

10

Focus bias 8-step up

Middle of focus bias up/down turning point

Tracking servo, sled servo off

Auto gain initialization

Focus servo off

Focus bias 8-step down

Immediate readjustment of focus bias

Tracking servo, sled servo on

Auto focus bias start point

Function

Button

The spindle servo for playback sets into the CLV-S mode when
the TP2 (AFADJ) terminal is connected to Ground after turning on
the power.

R621

— 8 —

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. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turn Power switch on again and ac-

tuate the focus search. (actuate the focus search when disc table
is moving in and out.)

5. 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

BD board

TP (FE)
TP (VC)

symmetry

A

B

within 3 ± 1 Vp-p

6. After check, remove the lead wire connected in step 2.
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.

BD board

TP (RF)
TP (VC)

oscilloscope

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.

Note:
A clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.

       RF signal waveform

level : 1.25 ± 0.25 Vp-p

VOLT/DIV : 200mV
TIME/DIV : 500ns

oscilloscope

BD board

TP (TE)
TP (VC)

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “

P (Pause)” button. (Becomes the 1 track jump mode)

5. 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%

     1 track jump waveform

Center of the waveform

0V

B

level : 1.3 ± 0.6 Vp-p

symmetry

A (DC voltage)

oscilloscope

BD board

TP (TE)
TP (VC)

Procedure :
1. Connect the test point TP1 (ADJ) on MAIN board to the ground

with a lead wire on main board.

2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turn the Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the “3” button. (The tracking servo and the sledding servo

are turned OFF.)

oscilloscope