8.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob so that the waveform of the oscilloscope becomes the specified value.
(When the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob is rotated, the 
of “EFB-
” changes and the waveform changes.) In this adjustment, waveform varies at intervals of approx. 2%. Adjust the wave- form so that the specified value is satisfied as much as pos- sible.
(Write power traverse adjustment)
(Traverse Waveform)
A
VC
B
Specification A = B
9.Press the [YES] button, and save the adjustment results in the
SAV” will be displayed for a moment.)
10.“EFB = 
The optical
11.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob 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)
A
VC
B
Specification A = B
12.Press the [YES] button, and save the adjustment results in the
SAV” will be displayed for a moment.)
Next “EF MO ADJUS” is displayed. The disc stops rotating automatically.
13.Press the [ÊÊÊÊÊEJECT]¤ button and remove the disc.
14.Load the check disc (MD)
15.Roteto [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “EF CD ADJUS” (C12).
16.Press the [YES] button and display “EFB = 
CD”. Servo is imposed automatically.
17.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob 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)
A
VC
B
Specification A = B
18.Press the [YES] button, display “EFB = 
SAV” for a mo- ment and save the adjustment results in the
Next “EF CD ADJUS” will be displayed.
19.Press the [ÊÊÊÊÊEJECT]¤ button and remove the check disc (MD)
12.FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1.Load a test disk
2.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “CPLAY MODE” (C29).
3.Press the [YES] button and display “CPLAY MID”.
4. Press the [MENU/NO] button when “C = | AD = ” is |
displayed. |
|
5.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “FBIAS AD- JUST” (C13).
6.Press the [YES] 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.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob in the clockwise direction and find the focus bias value at which the C1 error rate be- comes 220 (Refer to Note 2).
8.Press the [YES] button and display “ 
/
b = 
”.
9.Rotate the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob in the counterclockwise di- rection and find the focus bias value at which the C1 error rate becomes 220.
10.Press the [YES] button and display “ 
/
c = 
”.
11.Check that the C1 error rate is below 50 and ADER is 00. Then press the [YES] button.
12.If the “( 
)” in “ 
- 
- 
(
)” is above 20, press the [YES] button.
If below 20, press the [MENU/NO] button and repeat the ad- justment from step 2.
13.Press the [ÊÊÊÊÊEJECT]¤ button to remove the test 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 follow- ing 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 vale.
C1 error
220
b | c | a | Focus bias value |
|
|
| (F. BIAS) |
– 29 –