Sony MDS-SD1 service manual Traverse Adjustment, Optical pick-up label

7.Then, rotate the –˜+ knob and display “LDPWR CHECK”.

8.Press the ENTER/YES button once and display “LD 0.9 mW $

”. Check that the reading of the laser power meter become 0.85 to 0.91 mW.

9.Press the ENTER/YES button once more and display “LD 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 MENU/NO button and display “LDPWR CHECK” and stop the laser emission.

(The MENU/NO button is effective at all times to stop the laser emission.)

11.Rotate the –˜+ knob to display “Iop.Write”.

12.Press the ENTER/YES button. When the display becomes Ref=@@@.@ (@ is an arbitrary number), press the ENTER/ YES 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 : Rotate the –˜+ knob.

To select the digit : Press the CD SYNC/MD WM SYNC but- ton.

14.When the ENTER/YES 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 ENTER/YES button is pressed, the display will be switched between “LD 0.7 mW $ ”,

“LD 6.2 mW $ ”, and “LD 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 )/± button and move the optical pick-up out- side the pit.

4.Rotate the –˜+ knob and display “EF MO ADJUST”.

5.Press the ENTER/YES button and display “EFB = MO-R”. (Laser power READ power/Focus servo ON/tracking servo OFF/ spindle (S) servo ON)

6.Rotate the –˜+ knob so that the waveform of the oscillo-

scope becomes the specified value.

(When the –˜+ knob is rotated, the of “EFB= ” changes and the waveform changes.) In this adjustment, waveform var- ies 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 ENTER/YES button and save the result of adjustment to the non-volatile memory (“EFB = SAVE” will be displayed

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

8.Rotate the –˜+ knob so that the waveform of the oscillo-

scope becomes the specified value.

(When the –˜+ knob is rotated, the of “EFB- ” changes and the waveform changes.) In this adjustment, waveform var- ies 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 ENTER/YES 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.

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