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— 5 —

 Follow the disassembly procedure in the numerical order given.

1

Push the part A in the direction of arrow to
remove the loading panel upward.

A part

6

Two screws
(BVTP2.6x8)

8

Panel bracket

4

Connector
(CN751)

Claw

3

Screw (BVTP3x8)
(AEP, G only)

2

Three screws
(BVTP3x8)

5

Connector (CN302)
(Flat type 23 core)

Claw

7

Wire

9

Remove the front panel assembly
with care to claws.

— 6 —

When the 

p button is pressed, the following will be displayed.

(partial lighting 2)

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 “17”. It will not count
for buttons already pressed once, but will display the button’s
number.

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)

2

4

6

8

10

12

14

16

18

20

(Partial lighting 2)

(Partial lighting 1)

8

 

8 8 8

When the 

· button of the remote commander is pressed, the

“

·” lights up. All go off when the other buttons are pressed.

• Initial setting of digital filter and release of mute.
• When the TP2 (AFADJ) terminal on MAIN board is set to HIGH

(VDD), emphasis turns on. When set to LOW (Ground), it turns
off.

TIME

FADER

REPEAT

PLAY MODE

EDIT/

TIME FADE

PEAK SEARCH

AUTO SPACE

MUSIC SCAN

P

00

01

02

03

ENTER

CLEAR

CHECK

)

0

OPEN/

CLOSE 

§

PLAY 

·

STOP 

p

32

33

34

35

36

04

05

06

07

25

Button

Button No.

Displayed

Button

Button No.

Displayed

88

8888

88

Â

Display of counting

Â

Display of button number

All lit

Partial lighting 1

Partial lighting 2

— 7 —

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 Key Operrations in ADJ
Mode.)

The spindle servo for playback sets into the CLV-S mode when
the TP1 (ADJ) terminal is connected to Ground after turning on the
power.

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.

[ MAIN BOARD ] — Component Side —

CN302

IC920

TP1 (ADJ)
TP2 (AFADJ)

CN301

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

— 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. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and

actuate 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

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.

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

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

◊

” can be

clearly distinguished at the center of the waveform.

RF signal waveform

Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Turned 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

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

BD board

TP (FE)
TP (VC)

symmetry

A

B

within 3 ± 1 Vp-p

BD board

TP (RF)
TP (VC)

oscilloscope

level : 1.3           Vp-p

VOLT/DIV : 200mV
TIME/DIV : 500ns

+0.25
–0.20

oscilloscope

BD board

TP (TE)
TP (VC)

Center of the waveform

0V

B

level : 1.3 ± 0.6 Vp-p

symmetry

A (DC voltage)

oscilloscope

BD board

TP (TE)
TP (VC)