40
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
lm
/TUNING – button or
ML
/
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” is displayed. The disc stops rotating
automatically.
13. Press the
A
(MD) button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Press the
lm
/TUNING – button or
ML
/
button and display “EF CD ADJUST”.
16. Press the ENTER/YES “R” button and display “EFB =
CD”. Servo is locked automatically.
17. Press the
lm
/TUNING – button or
ML
/
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” will be displayed.
19. Press the
A
(MD) button and remove the check disc (MD)
TDYS-1.
Note 1 : MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the
oscilloscope as shown in the following figure so that it can
be seen more clearly.
5-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Press the
lm
/TUNING – button or
ML
/
button and display “CPLAY MODE”.
3. Press the ENTER/YES “R” button and display “CPLAY MID”.
4. Press the MENU/NO “R” button when “C1 =
AD =
”
is displayed.
5. Press the
lm
/TUNING – button or
ML
/
button and display “FBIAS ADJUS”.
6. Press the ENTER/YES “R” button and 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
ML
/ 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 and display “
/
b =
”.
9. Press the
lm
/TUNING – button and find the focus bias
value at which the C1 error rate becomes about 200.
10. Press the ENTER/YES “R” button and display “
/
c =
”.
11. Check that the C1 error rate is 50 or less 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 20 or less, press the MENU/NO“R” button and repeat the
adjustment from step 2.
13. Press the
A
(MD) button to remove the test disc.
Selection of digit : Press the SYNCHRO REC button and the
ENTER/START button at the same time
quickly. Note 1:
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 automatically calculated from points a
and b.
Note 2 : As the C1 error rate changes, perform the adjustment using
the average vaue.
VC
A
B
Specification : A = B
VC
A
B
Specification : A = B
330 k
Ω
Oscilloscope
10pF
BD (MD) board
CN110 pin
3
(TE)
CN110 pin
1
(VC)
C1 error
about
200
b
c
a
Focus bias value
(F. BIAS)