Sony MDS-JE480 Service Manual Download

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MDS-JE480

7. Then, rotate the

AMS

knob and display “LDPWR

CHECK”.

8. Press the YES button once and display “L 0.93 mW $

”.

Check that the reading of the laser power meter become the speci-
fied value.

9. Press the YES button once more and display “L 7.25 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 : L 0.93mW : 0.85-0.91mW (260B)

0.90-0.96mW (260E)

L 7.25mW : 6.90-7.10mW (260B)

7.20-7.30mW (260E)

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

(Optical pick-up label)

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

AMS

knob to display “Iop.Write”.

12. Press the YES button. When the display becomes Ref = @@@

.@ (@ is an arbitrary number), press the 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

AMS

knob.

To select the digit : Press the

AMS

knob

14. When the 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 YES button is pressed, the

display will be switched between “L 0.73 mW $

”, “L

6.40 mW $

”, and “L Wp

”. Nothing needs

to be performed here.

5-12. TRAVERSE ADJUSTMENT

Connection :

Adjusting Procedure :
1. Connect an oscilloscope to CN105 pin

(TE) and CN105 pin

(VC) of the BD board.

2. Load a test disc (MDW-74/GA-1). (Refer to Note 1.)
3. Press the

button and move the optical pick-up outside the

pit.

4. Rotate the

AMS

knob and display “EF MO AD-

JUST”.

5. Press the YES button and display “EFB =

MO-R”.

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

6. Rotate the

AMS

knob so that the waveform of the

oscilloscope becomes the specified value.
(When the

AMS

knob is rotated, the

of “EFB=

” changes and the waveform changes.) In this adjustment,

waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as possible.
(Read power traverse adjustment)

(Traverse Waveform)

7. Press the 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

AMS

knob so that the waveform of the

oscilloscope becomes the specified value.
(When the

AMS

knob is rotated, the

of “EFB-

MO-W” changes and the waveform changes.) In this adjustment,
waveform varies at intervals of approx. 2%. Adjust the wave-
form so that the specified value is satisfied as much as possible.
(Write power traverse adjustment)

(Traverse Waveform)

9. Press the 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.

V : 0.5 V/div
H : 10 ms/div
Input : DC mode

Oscilloscope

BD board

CN105 pin