MDS-JE330 - Sony Audio Service Manual (repair manual). Page 24

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KMS

260A

27X40
B0825

N

Iop = 82.5 mA in this case
Iop (mA) = Digital voltmeter reading (mV)/1 (

Ω

)

7. Then, rotate the  AMS  knob and display “LDPWR CHECK”.
8. Press the  YES  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  YES  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.

Laser power meter reading : 7.0 ± 0.1 mW
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 “0.7 mW 

*** $  ”, “6.2

mW 

*** $  ”, and “Wp               *** $  ”. Nothing

needs to be performed here.

(For details of the method for checking
this value, refer to “5-8. Recording and
Displaying IOP Information”.)

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 outside the

pit.

4. Rotate the  AMS  knob and display “EF MO ADJUST”.
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 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)

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- 

” 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)

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

CN110 pin 

3

 (TE)

CN110 pin 

1

 (VC)

VC

A

B

Specification A = B

VC

A

B

Specification A = B