– 23 –
7. Press the YES/ENTER button to save the adjustment result to
the non-volatile storage memory (at this time “ EFB=
SAVE
” will be displayed for an instant, then “ EFB=
MO-W ” will
be displayed).
8. Turn the AMS dial so that the waveform on the oscilloscope is
that of the specified value (turning the AMS dial will change the
numbers of “ EFB=
” as well as the waveform). During this
adjustment, the waveform changes for approximately every 2%.
Adjust the waveform closest to the specified value.
(write power traverse adjustment)
9. Press the YES/ENTER button to save the adjustment result to
the non-volatile storage memory (at this time “ EFB=
SAVE
” will be displayed for an instant).
10 “ EFB=
MO-P ” will then be displayed and the servo will be
activated after the optical pickup is automatically shifted to the
inner edge of the pit.
11. At this time, turn the AMS dial so that the waveform on the
oscilloscope is that of the specified value. During this adjust-
ment, the waveform changes for approximately every 2%. Ad-
just the waveform closest to the specified value.
12. Press the YES/ENTER button to save the adjustment result to
the non-volatile storage memory (at this time “ EFB=
SAVE
” will be displayed for an instant). “EFBAL CD” will then be
displayed and the rotation of the disk will automatically stop.
13. Press the MD EJECT button to remove the disk.
14. Insert the check disk (MD) TDYS-1.
15. Press the YES/ENTER button to display “ EFB=
CD ”. The
servo will automatically be activated.
16. Turn the AMS dial so that the waveform on the oscilloscope is
that of the specified value. During this adjustment, the wave-
form changes for approximately every 2%. Adjust the wave-
form closest to the specified value.
17. Press the YES/ENTER button to save the adjustment result to
the non-volatile storage memory (at this time “EFB=
SAVE”
will be displayed for an instant). “EFBAL ADJUST” will then
be displayed.
(Traverse waveform)
Specification: A=B
VC
A
B
(Traverse waveform)
Specification: A=B
VC
A
B
(Traverse waveform)
Specification: A=B
VC
A
B
5-8. FOCUS BIAS ADJUSTMENT
Procedure:
1. Insert a continuously recorded disk (see 5-4. Creating a con-
tinuous recording disk).
2. Turn the AMS dial until “CPLAY MODE” is displayed.
3. Press the YES/ENTER button to display “CPLAY MID”.
4. When “C1=
AD=
” is displayed, press the NO/CAN-
CEL button.
5. Turn the AMS dial until “FBIAS ADJUST” is displayed.
6. Press the YES/ENTER button to display “
/
a=
”.
The first 4 digits indicate the C1 error rate, the 2 digits follow-
ing “/” indicate ADER and the 2 digits following “a=” indicate
the focus bias volume.
7. Turn the AMS dial clockwise and search the focus bias volume
closest to the C1 error rate of 220 (see Note 2).
8. Press the YES/ENTER button to display “
/
b=
”.
9. Turn the AMS dial counterclockwise and search the focus bias
volume which is the C1 error rate of 220.
10. Press the YES/ENTER button to display “
/
c=
”.
11. Press the YES/ENTER button after making sure that the C1 er-
ror rate is below 50 and ADER is 00.
12. Press the YES/ENTER button if the value indicated in the
“
-
-
(
)” display is more than 20.
Otherwise, press the NO/CANCEL button and repeat procedure
from step 2.
13.Press the MD EJECT button to remove the continuously recorded
disk.
Note 1:
The relationship of the C1 error and focus bias volume is
shown in the diagram below. Find points a and b shown
in the diagram by following the procedure above. The
met focal point C is found by automatic calculation.
Note 2:
The C1 error rate fluctuates. Thus, make the adjustment
using the average value.
18. Press the MD EJECT button to remove the check disk (MD)
TDYS-1.
Note 1:
When using a pre-recorded disk for adjustment, data will
be deleted during MO write.
Note 2:
If the traverse waveform is hard to see, reconnect the
oscilloscope as shown below for easier view.
CN110
3
pin (TEO)
CN110
2
pin (VC)
Oscilloscope
10pF
330k
Ω
[BD BOARD] (SIDE A)
