6. Press the = , + buttons so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ^ “PRO-

GRAM” button and save it.

Note : Do not perform the emission with 7.0 mW more than 15 seconds continuously.

7.Then, press the + button and display “PWR CHECK”.

8.Press the ^ “PROGRAM” button once and display “0.9 mW*** $ ”. Check that the reading of the laser power meter become 0.85 to 0.91 mW. (*** means IOP value)

9.Press the ^ “PROGRAM” button once more and display “7.0 mW*** $ ”. Check that the reading the laser power meter and digital volt meter satisfy the specified value.

Note down the digital voltmeter reading value.

Specified Value :

Laser power meter reading : 7.0 ± 0.1 mW

Digital voltmeter reading : Optical pick-up displayed value ± 10%

(Optical pick-up label)

KMS260A

(For details of the method for checking

27X40

this value, refer to “5-8. Recording and

Displaying IOP Information”.)

B0825

 

 

 

N

 

Iop = 82.5 mA in this case

Iop (mA) = Digital voltmeter reading (mV)/1 (Ω)

10. Press the p “PROGRAM” button and display “LDPWR CHECK” and stop the laser emission.

(The p “PROGRAM” button is effective at all times to stop the laser emission.)

11. Press the + button to display “Iop.Write”.

12. Press the ^ “PROGRAM” button. When the display be- comes Ref=@@@.@ (@ is an arbitrary number), press the ^

“PROGRAM” button to display “Measu=@@@.@” (@ is an arbitrary number).

13. The numbers which can be changed will blink. Input the Iop value noted down at step 9.

To select the number : Press the = , + buttons.

To select the digit : Press the r“PROGRAM” buttan

14. When the ^ “PROGRAM” button is pressed, “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop Write”.

Note 1: After step 4, each time the ^ “PROGRAM” button is pressed, the display will be switched between “0.7 mW***

$ ”, “6.2 mW*** $ ”, and “ WP *** $ ”. Nothing needs to be performed here.

5-11. TRAVERSE ADJUSTMENT

Connection :

Oscilloscope

BD board

CN110 pin 3 (TE)

CN110 pin 1 (VC)

V : 0.5 V/div

H : 10 ms/div

Input : DC mode

Adjusting Procedure :

1.Connect an oscilloscope to CN110 pin 3 (TE) and CN110 pin 1 (VC) of the BD board.

2.Load a disc (any available on the market). (Refer to Note 1.)

3.Press the +“PROGRAM” button and move the optical pick- up outside the pit.

4.Press the + button and display “EF MO ADJUST”.

5.Press the + button and display “EFB = MO-R”.

(Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)

6.Press the + button so that the waveform of the oscilloscope becomes the specified value.

(When the =, + buttons is pressed, the of “EFB= ” changes and the waveform changes.) In this adjustment, wave- form varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Read power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

7.Press the ^ “PROGRAM” button and save the result of ad-

justment to the non-volatile memory (“EFB = SAVE” will be

displayed for a moment. Then “EFB = MO-W” will be dis- played).

8.Press the = , + buttons so that the waveform of the oscilloscope becomes the specified value.

(When the =, + buttons is pressed, the of “EFB- ” changes and the waveform changes.) In this adjustment, wave- form varies at intervals of approx. 2%. Adjust the waveform so that the specified value is satisfied as much as possible.

(Write power traverse adjustment)

(Traverse Waveform)

A

VC

B

Specification A = B

9.Press the ^ “PROGRAM” button, and save the adjustment

results in the non-volatile memory. (“EFB = SAVE” will be displayed for a moment.)

10.“EFB = MO-P”. will be displayed.

The optical pick-up moves to the pit area automatically and servo is imposed.

26

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Image 26
Sony MDS-PC2 service manual Traverse Adjustment, Optical pick-up label

MDS-PC2 specifications

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