MDS-SD1 - Sony Audio Service Manual (repair manual). Page 28

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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  – 

˜ +  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.

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  – 

˜ +  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.

(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 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)

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)

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.

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