45
8. Press the
. m
“R”
or
M >
“R”
button so that the
waveform of the oscilloscope becomes the specified value.
(When the
. m
“R”
or
M >
“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
. m
“R”
or
M >
“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
[MD ]
button and take out the disc.
14. Load the check disc (TDYS-1).
15. Press the
. m
“R”
or
M >
“R”
button to display “EF
CD ADJUST” (C08).
16. Press the
ENTER/YES “R”
button to display “EFB =
CD”.
Servo is imposed automatically.
17. Press the
. m
“R”
or
M >
“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.
Traverse Waveform
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
[MD ]
button and take out the check disc.
Adjustment Location: BD (MD) board (see page 47)
13. FOCUS BIAS ADJUSTMENT
Procedure:
1. Load the continuously-recorded disc. (Refer to “5. USING
THE CONTINUOUSLY RECORDED DISC” (See page 40))
2. Press the
. m
“R”
or
M >
“R”
button to display
“CPLAY2 MODE” (C36).
3. Press the
ENTER/YES “R”
button to display “CPLAY2MID”.
4. Press the
MENU/NO “R”
button when “C =
AD =
)”
is displayed.
5. Press the
. m
“R”
or
M >
“R”
button to display
“FBIAS ADJUST” (C09).
6. Press the
ENTER/YES “R”
button to 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. Press the
M >
“R”
button and find the focus bias value at
which the C1 error rate becomes about 200 (refer to Note 2).
8. Press the
ENTER/YES “R”
button to display “
/
b =
”.
9. Press the
. m
“R”
button and find the focus bias value at
which the C1 error rate becomes about 200.
10. Press the
ENTER/YES “R”
button to display “
/
c =
”.
11. Check that the C1 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 the
[MD ]
button and take out the 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 auto-
matically calculated from points A and B.
Note 2:
As the C1 error rate changes, perform the adjustment using the
average vale.
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
Z
Z
Z
C1 error
about
200
B
C
A
Focus bias value
