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8. Turn the ≠↔± dial so that the waveform of the oscil-
loscope becomes the specified value.
(When the ≠↔± dial is turned, the
changes and the waveform transforms)
In this adjustment, 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)
VC
Specification A = B
[ENTER/YES]
9. Press the
sults in the non-volatile memory. ("EFB =
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. Turn the ≠↔± dial until the waveform of the oscillo-
scope becomes 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)
VC
Specification A = B
[ENTER/YES]
12. Press the
sults in the non-volatile memory. ("EFB =
displayed for a moment)
Next "EF MO ADJUST" is displayed. The disc stops rotating
automatically.
13. Press the § (MD) button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Turn the ≠↔± dial to display "EF CD ADJUST"
(C12).
[ENTER/YES]
16. Press the
Servo is imposed automatically.
17. Turn the ≠↔± dial so that the waveform of the oscil-
loscope becomes 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)
VC
Specification A = B
of "EFB-
A
B
button, and save the adjustment re-
SAVE" will be
A
B
button, and save the adjustment re-
SAVE" will be
button to display "EFB =
A
B
[ENTER/YES]
18. Press the
for a moment and save the adjustment results in the non-vola-
"
tile memory.
Next "EF CD ADJUST" will be displayed.
19. Press the § (MD) button and take out the check disc (MD)
TDYS-1.
11. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Turn the ≠↔± dial to display "CPLAY MODE" (C30).
[ENTER/YES]
3. Press the
[MENU/NO]
4. Press the
displayed.
5. Turn the ≠↔± dial to display "FBIAS ADJUST"
(C13).
[ENTER/YES]
6. Press the
The first four digits indicates the C1 error rate, the two digits
after "/" indicates ADER, and the 2 digits after "a =" indicates
the focus bias value.
7. Turn the ≠↔± dial in the clockwise and find the fo-
cus bias value at which the C1 error rate becomes 220. (Refer
to Note 2)
[ENTER/YES]
8. Press the
9. Turn the ≠↔± dial in the counterclockwise and find
the focus bias value at which the C1 error rate becomes 220.
[ENTER/YES]
10. Press the
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the
12. If the "( " in "
YES]
button.
If below 20, press the
justment from step 2.
13. Press the § (MD) button and take out 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 fol-
lowing figure using the above adjustment. The focal point posi-
tion c is automatically calculated from points a and b.
Note 2: As the C1 error rate changes, perform the adjustment using the
average vale.
C1 error
220
CD".
b
– 37 –
button, display "EFB =
button to display "CPLAY MID".
button when "C =
button to display "
button and display "
button to display "
[ENTER/YES]
button.
-
-
( " is above 20, press the
[MENU/NO]
button and repeat the ad-
c
a
SAVE"
AD =
" is
/
a =
".
/
b =
".
/
c =
".
[ENTER/
Focus bias value
(F. BIAS)
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