Sony HCD-MD373 service manual Traverse Adjustment, Check

5.Then “LD 7.0 mW $ ” will be displayed.

6.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the reading of the laser power meter becomes 6.9 to 7.1 mW, press the ENTER/YES “R” but-

ton and save it.

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

7.Then, Press the =0/MD/CD/TUNING – button or )+/MD/CD/TUNING + button and display “LDPWR

CHECK”.

8.Press the ENTER/YES “R” button once and display “LD 0.9 mW $ ”. Check that the reading of the laser power meter be- come 0.85 to 0.91 mW.

9.Press the ENTER/YES “R” 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 “R” button and display “LDPWR CHECK” and stop the laser emission.

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

11. Press the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button to display “Iop.Write”.

12. Press the ENTER/YES “R” button. When the display becomes Ref=@@@.@ (@ is an arbitrary number), press the ENTER/

YES “R” button to display “Measu=@@@.@” (@ is an arbi- trary 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 =0/MD/CD/TUNING –

button or )+/MD/CD/TUNING + button. To select the digit : Press the SYNC REC button.

14. When the ENTER/YES “R” 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 “R” 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 (MD) 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 )+/MD/CD/TUNING + button continuously and move the optical pick-up outside the pit.

4.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “EF MO ADJUST”.

5. Press the ENTER/YES “R” button and display “EFB =	MO-
R”.

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

6.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the waveform of the oscillo-

scope becomes the specified value.

(When the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button 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 ENTER/YES “R” 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 =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button so that the waveform of the oscillo-

scope becomes the specified value.

(When the =0/MD/CD/TUNING – button or)+/ MD/CD/TUNING + button 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

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