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7. Turn the
(MD) knob so that the waveform of
l AMS L
the oscilloscope becomes the specified value.
(When the
l AMS L
"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
VC
Specification A = B
[YES]
8. Press the
button, and save the adjustment results in the
non-volatile memory. ("EFB =
for a moment)
9. "EFB =
MO-P" will be displayed.
The optical pick-up moves to the pit area automatically and
servo is imposed.
10. Turn the
l AMS L
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
VC
Specification A = B
[YES]
11. Press the
button, and save the adjustment results in the
non-volatile memory. ("EFB =
for a moment.)
Next "EF MO ADJUS" (C07) is displayed. The disc stops ro-
tating automatically.
[EJECT]
12. Press the
button and take out the disc.
13. Load the check disc (MD) (TDYS-1).
14. Turn the
l AMS L
ADJUS" (C08).
[YES]
15. Press the
button to display "EFB =
imposed automatically.
16. Turn the
(MD) knob so that the waveform of
l AMS L
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
VC
Specification A = B
(MD) knob is turned, the
A
B
SAVE" will be displayed
(MD) knob until the waveform of
A
B
SAVE" will be displayed
(MD) knob to display "EF CD
CD". Servo is
A
B
[YES]
17. Press the
button, display "EFB =
ment and save the adjustment results in the non-volatile
of
memory.
Next "EF CD ADJUS" (C08) will be displayed.
[EJECT]
18. Press the
1).
Adjustment Location: BD (MD) board (see page 43)
5-14. FOCUS BIAS ADJUSTMENT
Adjusting Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Turn the
l AMS L
MODE" (C36).
[YES]
3. Press the
button to display "CPLAY 2MID".
[MENU/NO]
4. Press the
displayed.
5. Turn the
l AMS L
ADJUS" (C09).
[YES]
6. Press the
button to display "
The first four digits indicate the C error rate, the two digits
after "/ " indicate ADER, and the 2 digits after "a =" indicate
the focus bias value.
7. Turn the
l AMS L
focus bias value at which the C error rate becomes about 200
(refer to Note 2).
[YES]
8. Press the
button to display "
9. Turn the
l AMS L
the focus bias value at which the C error rate becomes about
200.
[YES]
10. Press the
button to display "
11. Check that the C error rate is below 20 and ADER is 00. Then
[YES]
press the
button.
12. If the "( )" in "
button.
If below 20, press the
justment from step 2.
[EJECT]
13. Press the
Note 1: The relation between the C 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.
Note 2: As the C error rate changes, perform the adjustment using the
average vale.
C error
about
200
B
MXD-D400
SAVE" for a mo-
button and take out the disc (MD) (TDYS-
(MD) knob to display "CPLAY 2
button when "C =
AD =
(MD) knob to display "FBIAS
/
a =
(MD) knob clockwise and find the
/
b =
(MD) knob counterclockwise and find
/
c =
-
-
( )" is above 20, press the
[MENU/NO]
button and repeat the ad-
button and take out the disc.
Focus bias value
C
A
" is
".
".
".
[YES]
41
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