44
HCD-M333
8. Press the
.
“R” or
>
“R” button so that the waveform
of the oscilloscope becomes the specified value.
(When the
.
“R” or
>
“R” button is pressed, the
of
“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
9. Press the ENTER/YES “R”
button, 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. Press the
.
“R” or
>
“R” button 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 ENTER/YES “R”
button, 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. Press the
Z
(MD) button and take out the disc.
14. Load the check disc (TDYS-1).
15. Press the
“R” button to display “EF CD
CD”. Servo is imposed automatically.
“R” button 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.
18. Press the ENTER/YES “R”
button, display “EFB =
SAVE”
for a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” (C08) will be displayed.
19. Press the
Z
(MD) button and take out the check disc.
Adjustment Location: BD (MD) board (see page 46)
13. Focus Bias Adjustment
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the
.
“R” or
>
“R” button to display “CPLAY2
MODE” (C36).
3. Press the ENTER/YES “R”
button to display “CPLAY 2MID”.
4. Press the
MENU/NO “R”
button when “C =
AD =
)” is displayed.
5. Press the
.
“R” or
>
“R” button to display “FBIAS
ADJUST” (C09).
6. Press the ENTER/YES “R” button to display “
/
a
=
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
>
“R” button and find the focus bias value at
which the C error rate becomes about 200 (refer to Note 2).
8. Press the ENTER/YES “R”
button to display “
/
b
=
T”.
9. Press the
.
“R” button and find the focus bias value at
which the C error rate becomes about 200.
10. Press the ENTER/YES “R”
button to display “
/
c
=
T”.
11. Check that the C error rate is below 20 and ADER is 00. Then
press the ENTER/YES “R”
button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the
ENTER/YES “R”
button.
If below 20, press the
MENU/NO “R”
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.
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
C error
about
200
B
C
A
Focus bias value
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