11.Rotate the lAMS L 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
Next “EF MO ADJUS” is displayed. The disc stops rotating automatically.
13.Press the AEJECT button and remove the disc.
14.Load the check disc (MD)
15.Roteto lAMS L knob and display “EF CD ADJUS”.
16. Press the YES button and display “EFB = CD”. Servo is imposed automatically.
17.Rotate the lAMS L 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 = SAVE” for a mo- ment and save the adjustment results in the
19.Press the A EJECT button and remove the check disc (MD)
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 oscillo- scope as shown in the following figure so that it can be seen more clearly.
Oscilloscope
BD board | 330 kΩ |
CN105 pin 4 (TE) | 10pF | ||
CN105 pin 6 | (VC) | ||
|
5-13. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1.Load a test disk
2.Rotate the l AMS L knob and display “CPLAY1 MODE”.
3.Press the YES button and display “CPLAY1 MID”.
4. Press the | MENU/NO | button when “C = | AD = ” is |
displayed. |
|
5.Rotate the l AMS L knob and display “FBIAS AD- JUST”.
6.Press the YES button and display “ / a = ”.
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.Rotate the lAMS L knob in the clockwise direction and find the focus bias value at which the C error rate becomes 220 (Refer to Note 2).
8.Press the YES button and display “ / b = ”.
9.Rotate the lAMS L knob in the counterclockwise di- rection and find the focus bias value at which the C error rate becomes 220.
10.Press the YES button and display “ / c = ”.
11.Check that the C error rate is below 20 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 | |||
| adjustment from step 2. |
|
|
|
| ||
13. | Press the | AEJECT | button to remove the test 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 automatically calculated from points a and b.
Note 2 : As the C error rate changes, perform the adjustment using the average vale.
Cerror
220
b | c | a | Focus bias value |
|
|
| (F. BIAS) |
33