41
HCD-M700
8. Press the MD . “R” or MD > “R” button so that the
waveform of the oscilloscope becomes the specified value.
(When the MD . “R” or MD > “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 MD . “R” or MD > “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 MD . “R” or MD > “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 MD . “R” or MD > “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 Z MD button and take out the check disc.
Adjustment Location: BD board (see page 43)
13. Focus Bias Adjustment
Procedure:
1. Load the check disc (MDW-74/GA-1).
2. Press the MD . “R” or MD > “R” button to display
“CPLAY1 MODE” (C34).
3. Press the ENTER/YES “R” button to display “CPLAY 1MID”.
4. Press the MENU/NO “R” button when “C = AD =
)” is displayed.
5. Press the MD . “R” or MD > “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 vale.
A
B
VC
Specification A = B
A
B
VC
Specification A = B
A
B
VC
Specification A = B
C error
about
200
B
CA
Focus bias value
w
w
w
.
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a
o
y
u
1
6
3
.
c
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Q
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3
7
6
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1
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1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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