MDS-NT1 - Sony Audio Service Manual (repair manual). Page 33

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8. Click the 

[JOG UP]

  or 

[JOG DOWN]

 so that the waveform

of the oscilloscope becomes the specified value.
(When the 

[JOG UP]

  or 

[JOG DOWN]

 is clicked, the 

 of

“EFB= 

” changes and the waveform changes.) In this ad-

justment, waveform 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

9. Click the 

[ENTER/YES]

, 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.

11. Click the 

[JOG UP]

 or 

[JOG DOWN]

 until the waveform of

the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform

12. Click the  

[ENTER/YES]

, and save the adjustment results in

the non-volatile memory. (“EFB = 

 SAVE” will be displayed

for a moment.)
Next “EF MO ADJUST” (C07) is displayed. The disc stops
rotating automatically.

13. Click the 

[EJECT]

 and take out the disc.

14. Load the check disc (MD) TDYS-1.
15. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “EF CD

ADJUST” (C08).

16. Click the 

[ENTER/YES]

 to display “EFB = 

 CD”. Servo is

imposed automatically.

17. Click the 

[JOG UP]

  or 

[JOG DOWN]

 so that the waveform

of the oscilloscope moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.

Traverse Waveform

18. Click the 

[ENTER/YES]

, display “EFB = 

 SAVE” for a mo-

ment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” (C08) will be displayed.

19. Click the 

[EJECT]

 button and take out the disc (MD) TDYS-

1.

Adjustment Location: BD board (see page 35)

Adjusting Procedure:
1. Load the continuously-recorded disc.  (Refer to “5.  USING

THE CONTINUOUSLY RECORDED DISC”)

2. Click the 

[JOG UP]

  or 

[JOG DOWN]

 to display “CPLAY2

MODE” (C36).

3. Click the 

[ENTER/YES]

 to display “CPLAY2MID”.

4. Click the 

[MENU/NO]

 when “C = 

 AD = 

” is displayed.

5. Click the 

[JOG  UP]

  or 

[JOG  DOWN]

 to display “FBIAS

ADJUST” (C09).

6. Click the 

[ENTER/YES]

 to display “

/

 a = 

”.

The first four digits indicate the C1 error rate, the two digits
after “/ ” indicate ADER, and the 2 digits after “a =” indicate
the focus bias value.

7. Click the 

[JOG UP]

 and find the focus bias value at which the

C1 error rate becomes about 200 (refer to Note 2).

8. Click the 

[ENTER/YES]

 to display “

/

 b = 

”.

9. Click the 

[JOG DOWN]

 and find the focus bias value at which

the C1 error rate becomes about 200.

10. Click the 

[ENTER/YES]

 to display “

/

 c = 

”.

11. Check that the C1 error rate is below 20 and ADER is 00.

Then click the 

[ENTER/YES]

.

12. If the “(

)” in “

 - 

 - 

  (

)” is above 20, click the

[ENTER/YES]

  button.

If below 20, click the 

[MENU/NO]

 and repeat the adjustment

from step 2.

13. Click the 

[EJECT]

 button and take out the disc.

The relation between the C1 error and focus bias is as shown in
the following figure. Find points A and B in the following figure
using the above adjustment. The focal point position C is auto-
matically calculated from points A and B.

As the C1 error rate changes, perform the adjustment using the
average vale.

A

B

VC

Specification A = B

A

B

VC

Specification A = B

A

B

VC

Specification A = B

C1 error

about 
200

B

C

A

Focus bias value

7. Click the 

[ENTER/YES]

 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).