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MDS-SE9
8. Press the MD
or MD
.
the oscilloscope becomes the specified value.
(When the MD
or MD
.
"EFB=
" changes and the waveform changes) 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
9. Press the [ENTER/START] button, and save the adjustment results
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. Press the MD
or MD
.
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
12. Press the [ENTER/START] button, and save the adjustment results
in the non-volatile memory. ("EFB =
displayed for a moment)
Next "EF MO ADJUST" (C07) is displayed. The disc stops
rotating automatically.
13. Press the Z MD button and take out the disc.
14. Load the check disc (TDYS-1).
15. Press the MD
or MD
.
ADJUST" (C08).
16. Press the [ENTER/START] button to display "EFB =
Servo is imposed automatically.
17. Press the MD
or MD
.
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
VC
Specification A = B
18. Press the [ENTER/START] button, display "EFB =
for a moment and save the adjustment results in the non-volatile
memory.
Next "EF CD ADJUST" (C08) will be displayed.
38
button so that the waveform of
>
button is pressed, the
>
A
B
SAVE" will be
button until the waveform of
>
A
B
SAVE" will be
>
button to display "EF CD
CD".
>
button so that the waveform
A
B
SAVE"
19. Press the Z MD button and take out the check disc.
Adjustment Location: BD board (see page 40)
of
13. Focus Bias Adjustment
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the MD
.
MODE" (C36).
3. Press the [ENTER/START] button to display "CPLAY 2MID".
4. Press the [MODE] button when "C =
displayed.
5. Press the MD
.
ADJUST" (C09).
6. Press the [ENTER/START] button to display "
T".
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. Press the MD
>
which the C error rate becomes about 200 (refer to Note 2).
8. Press the [ENTER/START] button to display "
T".
9. Press the MD
.
which the C error rate becomes about 200.
10. Press the [ENTER/START] button to display "
T".
11. Check that the C error rate is below 20 and ADER is 00. Then
press the [ENTER/START] button.
12. If the "(
)" in "
[ENTER/START] button.
If below 20, press the [MODE] button and repeat the adjustment
from step 2.
13. Press thet Z MD button and take out the disc.
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 value.
C error
about
200
B
or MD
button to display "CPLAY2
>
AD =
or MD
>
button to display "FBIAS
button and find the focus bias value at
button and find the focus bias value at
-
-
(
)" is above 20, press the
Focus bias value
C
A
)" is
/
a =
/
b =
/
c =
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