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— 9 —

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  impedance.
4. Clean the object lens by an applicatior with neutral detergent when

the signal level is low than specified value with the following
checks.

5. Adjust the focus bias adjustment when optical block is replaced.

Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that osilloscope waveform is clear and check RF signal

level is correct or not.

Note : Clear RF signal waveform means that the shape “

◊

” can be

clearly distinguished at the center of the waveform.

RF signal waveform

VOLT/DIV : 200mV

TIME/DIV : 500nS

Procedure :
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (ADJ) on DISPLAY board to

Ground with a lead wire.

3. Turn Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in and set to the stop mode.
5. Press the “15” button and actuate the focus serach.
6. Check the oscilloscope waveform (S-curve) is symmetrical

between A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.

S-curve waveform

level : 1.3 ± 0.3 Vp-p

Symmetry

within 2.4 ± 0.7 Vp-p

A

B

oscilloscope

BD board

TP(RF)

TP(VC)

7. 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.

oscilloscope
(DC range)

BD board

TP(RF)

TP(VC)

Procedure :
1. Connect oscilloscope to test point TP (RF).

(Ground terminal : VC)

2. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.

(Clear RF signal waveform means that the shape “

◊

” can be clearly

distinguished at the center of the waveform.)

5. After adjustment, check the RF signal level.

• RF signal

VOLT/DIV : 200 mV
TIME/DIV : 500 nS

level
1.3 ± 0.3 Vp-p

TP(FEO)

TP(VC)

BD board

oscilloscope

Note : Use the widely use remote commander with 20 keys for this

check.

— 10 —

[BD BOARD] (Conductor Side)

RF

FOK

RV101

RV103

IC101

IC102

TEI

FEI

TEO

RV102

VC

GND

PCK

FEO

TP(TEO)

TP(VC)

oscilloscope

BD board

Procedure :
1. Connect test point TP (ADJ) on DISPLAY board to Ground with

a lead wire.

2. Connect oscilloscope to test point TP (TEO).
3. Turn Power switch on to set the ADJ mode.
4. Put disc (YEDS-18) in and playback.
5. Press the “16” button. (The tracking servo and the sledding servo

are turn off)

6. Confirm that the oscilloscope waveform is symmetrical on the

top and bottom in relation to 0Vdc, and check this level.

Traverse waveform

0V

B

A

level : 300 ± 100 mVp-p

Specified level : • 

             X

 100=less than ± 7%

• A+B=300 ± 100 mVp-p

7. Remove the lead wire connected in step 1.

This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.

A-B

2(A+B)

IC104

IC401

R404

TP

ADJ

R405

TP

AFJ

Note : Use the widely use remote commander with 20 keys for this

check.

[DISPLAY BOARD] (Conductor Side)

— 11 —

LED board

BD board

TABLE SENSOR board

CD MOTOR board

MAIN board

FUNCTION board

DISPLAY board

DOOR SW board

POWER SW board

— 26 —

Function

Connected to Ground.

Remote control signal input.

Connected to Ground.

Serial data latch signal output.

Not used. (Open)

CD Table sensor signal input.

Latch signal output to digital filter (IC104).

Serial clock output.

Audio muting control signal output.

Serial data output.

Read out clock output for subcode Q data.

Subcode Q data input.

Not used. (Open)

Table motor control signal output.

Disc number LED drive signal output.

Not used. (Open)

Disc table up detect.

Key input (S511 to S517, S521 to S527)

+5V pin.

CD door open detection input.

ADJ test mode input. The equipment is fixed at “H”.

AFJ test mode input. The equipment is fixed at “H”.

Connected to Ground.

Connected to Ground.

Reset signal input.

Clock input. (5.08 MHz)

Clock output. (5.08 MHz)

Ground

Not used. (Open)

Fluorescent Indicator Tube segment output.

Not used. (Open)

Fluorescent Indicator Tube grid (timing) output.

–30V pin for Fluorescent Indicator tube.

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17 to 21

22

23

24

25

26

27

28

29

30

31

32

33

34 to 45

46 to 60

61 to 63

64 to 70

71

72

73

74 to 76

77

78

79

80

Connected to Ground.

Focus switch signal output.

Connected to Ground.

Read out timing signal input for subcode Q data.

SENSE signal input.

Pin Name

—

RM IN

—

XLT

—

T.SENSE

PRGL

CLK

MUTE

DATA

SQCK

SUBQ

—

TBL.R

TBL.L

LED

—

UPSW

KET 1

KEY 2

DOOR SW

ADJ

AFJ

—

—

RST

EXTAL

XTAL

V

SS

—

P1 to P15

—

1G to 7G

VG

V

DD

 (+5V)

—

—

FSW

—

SCOR

SENS

I/O

–

I

–

O

–

I

O

O

O

O

O

I

–

O

O

O

–

I

I

I

I

I

I

–

–

I

I

O

–

–

O

–

O

–

–

–

–

O

–

I

O