DOWNLOAD Sony CDP-CX270 / CDP-CX90ES Service Manual ↓ Size: 1.34 MB | Pages: 56 in PDF or view online for FREE

— 29 —

Waveform 2

Procedure:
1. Connect the oscilloscope to Pins 1, 2, and 4 of CN305 of the

MAIN board. Also connect a 1 k

Ω

 resistor to Pin 4 at the same

time. (Connection 1)

2. Disconnect the CN308 (2P) and CN306 (2P) cables of the MAIN

board. Connect the cables connected to CN306 (connected to the
T. MOTOR board) to CN308 .

9. Disconnect the resistor connected to Pin 4 of CN305 of the MAIN

board. (Connection 2)

10. Observe the waveform on the oscilloscope. (Waveform 2)
11. Adjust RV401 of the MAIN board so that the waveform on the

oscilloscope satisfies the following adjustment value 1.

12. Connect the connectors disconnected in Step 2 at their original

positions.

13. Close the front cover, and rotate the JOG dial in the counter-

clockwise direction continuously so that the rotary table rotates
continuously in the counterclockwise direction.

14. Observe the waveform on the oscilloscope and confirm that it

satisfies the adjustment value 2 (waveform 3). If it does not, ad-
just RV401 of the MAIN board.

Waveform 3:

15. After the adjustment, load a disc only in slit 1, close the front

cover, and press the POWER button to turn off the power.

16. Press the POWER button while pressing the ENTER button to

turn on the power.

17. If the rotary table makes one round, and “YES” is displayed on

the fluorescent indicator tube after it stops, it means that the ad-
justment has been performed properly.

Adjustment value 1:
At the shoulder part of waveform D1, T1 becomes H and T2 be-
comes L, and at the same time, the Y width must not be smaller than
1/4 of the Z width.
In order to satisfy this value more easily, adjust so that X=Y approxi-
mately and observe the deviation of the waveform.
Adjustment value 2:
At the shoulder part of waveform D1, T1 becomes H and T2 be-
comes L, and at the same time, the Y width must not be smaller than
1/4 of the Z width.

3. Open the front cover. (If closed, malfunctions by incorrect opera-

tions may result.)

4. Check that no discs are loaded in the unit, and press the POWER

button to turn ON the power.

5. The rotary table will continue rotating in the clockwise direction.
6. Observe the waveform at that time on the oscilloscope.
7. Loosen the screw securing the LUMINOUS board slightly.
8. Slide the LUMINOUS board to the left and right so that the peak

of the D0 waveform is at the center between the descending point
of the T1 waveform and ascending point of the T2 waveform.
(Waveform 1) After adjusting, apply locking compound.

— 30 —

— Component Side —

— Side B —

— 31 —

— 32 —

Pin Name

SRON

SRDR

SFON

TFDR

TRON

TRDR

TFON

FFDR

FRON

FRDR

FFON

VCOO

VCOI

TEST

DVss

TES2

TES3

PDO

VPCO

VCKI

AVD2

IGEN

AVS2

ADIO

RFC

RFDC

TE

SE

FE

VC

FILO

FILI

PCO

CLTV

AVS1

RFAC

BIAS

ASYI

ASYO

AVD1

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

I/O

O

O

O

O

O

O

O

O

O

O

O

O

I

I

–

I

I

O

O

I

–

I

–

I

O

I

I

I

I

I

O

I

O

I

–

I

I

I

O

–

Function

Sled drive output (Open)

Sled drive output

Sled drive output (Open)

Tracking drive output

Tracking drive output (Open)

Tracking drive output

Tracking drive output (Open)

Focus drive output

Focus drive output (Open)

Focus drive output

Focus drive output (Open)

VCO output for analog EFM PLL (Open)

VCO input from analog EFM PLL (Connected to Ground)

TEST pin connected normally to Ground (Connected to Ground)

Digital Ground

TEST pin connected normally to Ground

TEST pin connected normally to Ground

Charge-pump output for analog EFM PLL (Open)

Charge-pump output for variable pitch PLL (Open)

Clock input from variable pitch external VCO (Connected to Ground)

Analog power supply

Power supply pin for operational amplifiers

Analog Ground

(Open)

(Open)

RF signal input

Tracking error signal input

Sled error signal input

Focus error signal input

Center voltage input pin

Filter output for master PLL

Filter input for master PLL

Charge-pump output for master PLL

Control voltage input for master VCO

Analog Ground

EFM signal input

Asymmetry circuit constant current input

Asymmetry comparate voltage input

EFM full swing output

Analog power supply

• Abbreviation

EFM: Eight to Fourteen Modulation
PLL: Phase Locked Loop