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4-7. Focus Bias Adjustment
Adjusting Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display "CPLAY MODE".
3. Press the ENTER/YES button twice and display "CPLAY MID".
4. Press the EDIT/NO button when "C1 =
played.
5. Rotate the AMS knob and display "FBIAS ADJUST".
6. Press the ENTER/YES button and display "
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 AMS knob in the clockwise direction and find the fo-
cus bias value at which the C1 error rate becomes 220.
8. Press the ENTER/YES button and display "
9. Rotate the AMS knob in the counterclockwise direction and find
the focus bias value at which the C1 error rate becomes 220.
10. Press the ENTER/YES button and display "
11. Check that the C1 error rate is below 50 and ADER is 00. Then
press the ENETR/YES button.
12. If the "( )" in "
-
-
YES button.
If below 20, press the EDIT/NO button and repeat the adjust-
ment from step 2 again.
13. Press the EDIT/NO button and press the EJECT button to re-
move the continuously recorded 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
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 us-
ing the average vale.
C1 error
220
b
c
AD =
" is dis-
/
a =
/
b =
/
c =
( )" is above 20, press the ENTER/
Focus bias value
(F. BIAS)
a
4-8. Error Rate Check
4-8-1. CD Error Rate Check
Checking Method :
1. Load a test disc TDYS-1.
2. Rotate the AMS knob and display "CPLAY MODE".
3. Press the ENTER/YES button twice and display "CPLAY MID".
4. "C1 =
AD =
5. Check that the C1 error rate is below 20.
6. Press the EDIT/NO button, stop playback, press the EJECT but-
".
ton, and remove the test disc.
4-8-2. MO Error Rate Check
Checking Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display "CPLAY MODE".
".
3. Press the ENTER/YES button twice and display "CPLAY MID".
4. "C1 =
AD =
5. If the C1 error rate is below 50, check that ADER is 00.
".
6. Press the EDIT/NO button, stop playback, press the EJECT but-
ton, and remove the continuously recorded disc.
4-9. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Method :
1. Load a continuously recorded disc (MDW-74/AU-1).
2. Rotate the AMS knob and display "CPLAY MODE".
3. Press the ENTER/YES button twice and display "CPLAY MID".
4. Press the EDIT/NO button when "C1 =
played.
5. Rotate the AMS knob and display "FBIAS CHECK".
6. Press the ENTER/YES button and display "
The first four digits indicate the C1 error rate, the two digits after
[/] indicate ADER, and the 2 digits after [c =] indicate the focus
bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the ENTER/YES button and display "
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
8. Press the ENTER/YES button and display "
Check that the C1 error is not below 220 and ADER is not above
00 every time.
9. Press the EDIT/NO button, next press the EJECT button, and re-
move the continuously recorded disc.
Note 1 : If the C1 error and ADER are above 00 at points a or b, the
focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.
— 37 —
" is displayed.
" is displayed.
AD =
/
/
/
" is dis-
c =
".
b =
".
a =
".
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