Sony KMS-2608/J1N User Manual

28

11. Rotate the  AMS  knob 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. Press the  YES  button, and save the adjustment results in the

non-volatile memory. (“EFB = 

 SAVE” will be displayed for

a moment.)
Next “EF MO ADJUS” is displayed. The disc stops rotating
automatically.

13. Press the  A  button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto  AMS  knob and display “EF CD ADJUS”.
16. Press the  YES  button and display “EFB = 

 CD”. Servo is

imposed automatically.

17. Rotate the  AMS  knob 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. Press the  YES  button, display “EFB = 

 SAVE” for a mo-

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

19. Press the  A  button and remove the check disc (MD) TDYS-1.

Note 1 : MO reading data will be erased during if a recorded disc is

used in this adjustment.

Note 2 : If the traverse waveform is not clear, connect the oscillo-

scope as shown in the following figure so that it can be
seen more clearly.

Adjusting Procedure :
1. Load a test disk (MDW-74/GA-1).
2. Rotate the  AMS  knob and display “CPLAY1 MODE”.
3. Press the  YES  button and display “CPLAY1 MID”.
4. Press the  MENU/NO  button when “C1 = 

 AD = 

” is

displayed.

5. Rotate the  AMS  knob and display “FBIAS ADJUST”.
6. Press the  YES  button and 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. Rotate the  AMS  knob in the clockwise direction and find the

focus bias value at which the C1 error rate becomes 220 (Refer
to Note 2).

8. Press the  YES  button and display “ 

/

 b = 

”.

9. Rotate the  AMS  knob in the counterclockwise direction and

find the focus bias value at which the C1 error rate becomes
220.

10. Press the  YES  button and display “ 

/

 c = 

”.

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

press the  YES  button.

12. If the “(

” in “

 - 

 - 

 (

” is above 20, press the  YES

button.
If below 20, press the  MENU/NO  button and repeat the
adjustment from step 2.

13. Press the  A  button to remove the test disc.

Note 1 : 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 automatically calculated from points a
and b.

Note 2 : As the C1 error rate changes, perform the adjustment us-

ing the average vale.

Ω

4

6