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– 5 –

3

 BVTP 3

×

8

5

 MD block

    (CDM28-5BD19)

4

 claws

1

 CN202

2

 CN201

1

Turn the cam in the direction of  arrow.

2

 Pull out disc table.

3

 yoke bracket

4

 holder (BU) assy

     (BU-5BD19)

– 6 –

1. 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 10MΩ impedance.
4. Clean the objective lens by an applicator 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). (GND 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

Procedure:
1. Connect oscilloscope to test point TP(FEO).
2. Connect between test point TP(FOK)and GND by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turnd Power switch on again and

actuate the focus search. (In case of using SERVICE BOX actuate
the focus search when disc table is moving in and out.)

5. Check the oscillosope 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

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

• 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. Turn Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal

level is correct or not.

Clear RF signal waveform means that the shape “ ≈ ” can be clearly
distinguished at the center of the waveform.

RF signal waveform

BD board

oscilloscope

TP (FEO)
TP (FOK)

VOLT/DIV : 200mV
TIME/DIV : 500nS

level : 1.3±0.3 Vp-p

BD board

TP (RF)
TP (VC)

oscilloscope

BD board

TP (RF)

VC

oscilloscope
(DC range)

level
1.3±0.3 Vp-p

symmetry

within 2.4±0.7 Vp-p

A

B

– 7 –

Procedure:
1. Connect oscilloscpe to test point TP (TEO).
2. Turn Power switch on.
3. Connect pin @¢ of IC60I on the PANEL board to GND with a lead

wire.

4. Put disc (YEDS-18) in and playback.
5. Push TIME button.
6. Confirm that the oscilloscope waveform is symmetrical on the top

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

   Traverse waveform

7.Remove the lead wire connected in step 3.

This gain has a margin, so even if it is slightly off.
There is no problem.
Therefore, 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.

BD board

oscilloscope

TP (TEO)
TP (VC)

 

(Conductor Side)

0V

level : 300±100 mVp-p

symmetry

IC601

40

25

64

41

24

65

80

1

 

(Conductor Side)

IC101

RF

TEI

FEI

RV102

RV103

IC104

IC102

FEO

TEO

FOK

VC

GND

PCK

RV101

– 8 –

µ

Pin No.

Pin Name

I/O

Function

1-7

T6-T0

O

FL display grid output

8

VDD

—

+5V power supply

9

CLK

O

Serial clock output to DSP (CXD2507AQ).

10

DATA

O

Serial data output to DSP (CXD2507AQ).

11

—

—

Fixed at Ground.

12

XLAT

O

Serial data latch pulse output to DSP (CXD2507AQ).

13

PRGL

O

Serial data latch pulse output to D/F DAC (PCM1710U).

14

SQCLK

O

Sub code Q data read clock output to DSP (CXD2507AQ).

15

—

—

Not used. (Open)

16

SUBQ

I

Sub code Q data input from DSP (CXD2507AQ).

17

RESET

I

System reset input (“ L ”= Active)

18

INSW

I

S292 (load in switch) input

19

OUTSW

I

S291 (load out switch) input

20

AVSS

—

Ground

21

LDOUT

O

Output for rotating M903 (loading motor) in the loading out direction.

22

LDIN

O

Output for rotating M903 (loading motor) in the loading in direction.

23

ADJ

I

Test mode input. (“ L ”= Stops GFS check)

24

AFADJ

I

Test mode input. Fixed at “H”. (“ L ”= Test mode)

25

MODE

I

Not used. (Fixed at “ H ”.)

26-28

KEY2-KEY0

I

Key AD input

29

AVDD

—

+5V power supply

30

AVREF

—

+5V power supply

31

—

—

Fixed at Ground.

32

—

—

Not used. (Open)

33

VSS

—

Ground

34

X1

I

Clock input (5MHz)

35

X2

O

Clock output (5MHz)

36

BDRST

O

BD reset output

37

BDPOWER

O

BD power ON/OFF output

38

—

—

Not used. (Open)

39

SENS

I

SENS input from DSP (CXD2507AQ).

40

AMUTE

O

Not used. (Open)

41

FSW

O

Focus switch output

42

BSOUT

O

Audio bus output

43

—

—

Not used. (Open)

44

SCOR

I

Sub code sync S0+S1 detection input

45

JOG1

I

JOG input

46

—

—

Not used. (Open)

47

BSIN

I

Audio bus input

48

IC (VPP)

—

Connected to Ground.

49

JOG0

I

JOG input

50, 51

—

—

Not used. (Open)

52

VDD

—

+5V power supply

53-70

S22-S5

O

FL display segment output

71

VLOAD

—

-28V power supply for driving FL display.

72-76

S4-S0

O

FL display segment output

77-80

T10-T7

O

FL display grid output