Sony MDS-JA333ES Service Manual page 34

8. Rotate the lAMSL knob so that the waveform of the
oscilloscope is the specified value. (The figure
= " and the waveform are changed by rotating the
lAMSL knob.) In this adjustment. the 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)
VC
Specification: A = B
9. Press the YES button to save the adjustment results in the non-
volatile memory. (At this time "EFB =
for a moment)
10. "EFB = MO-P" appears and the optical pick-up moves to the
internal circumference of the pit area automatically and servo
is imposed.
11. Rotate the lAMSL knob so that the waveform of the
oscilloscope moves closer to the specified value.
In this adjustment. the 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)
VC
Specification: A = B
12. Press the YES button to save the adjustment results in the non-
volatile memory. (At this time "EFB =
for a moment)
Then, "EF MO ADJUS" (C07) appears and the disc stops
rotating automatically.
13. Press the A button to eject the disc.
14. Load a check disc (TDYS-1).
The disc is loaded by pushing the tray.
15. Rotate the lAMSL knob to display "EF CD ADJUS"
(C08).
16. Press the YES button to display "EFB =
imposed automatically.
17. Rotate the lAMSL knob so that the waveform of the
oscilloscope makes closer to the specified value.
In this adjustment. the waveform varies at intervals of approx.
2%. Adjust the waveform so that the specified value is satisfied
as much as possible.
(Traverse waveform)
VC
Specification: A = B
34
18. Press the YES button to save the adjustment results in the non-
of the " EFB volatile memory. (At this time "EFB =
for a moment)
Then, "EF CD ADJUS" (C08) appears and the disc stops rotating
automatically.
19. Press the A button to eject the check disc.
5-12. Focus Bias Adjustment
Adjustment procedure:
1. Load the test disc (MDW-74/GA-1).
A
The disc is loaded by pushing the tray.
2. Rotate the lAMSL knob to display "CPLAY1MODE"
(C34).
B
3. Press the YES button to display "CPLAY MID".
4. After "C =
button.
5. Rotate the lAMSL knob to display "FBIAS CHECK"
(C16).
SAV" is displayed
6. Press the YES button to display "
The first four digits indicate the C1 error rate, the two digits
after "/" indicate ADER, and the two digits after "a = " indicate
the focus bias amount.
7. Rotate the lAMSL knob in the clockwise direction and
find the focus bias amount at which the C1 error rate becomes
approx. 200. (Refer to Note 2.)
8. Press the YES button to display "
9. Rotate the lAMSL knob in the counterclockwise
direction and find the focus bias amount at which the C1 error
rate becomes approx. 200. (Refer to Note 2.)
Adjust the lAMSL knob so that the C1 error rate
becomes almost same value as the value set in step 7.
10. Press the YES button to display "
A
11. Confirm that the C1 error rate is below 50 and the ADER is 00
and press the YES button.
12. If "(
B
button.
If it is below 20, press the MENU/NO button and perform the
adjustment from the step 2 again.
13. Press the A button to eject the test disc.
Note 1: The relation between the C1 error and focus bias is as
SAV" is displayed
Note 2: As the C1 error rate changes, perform the adjustment using
CD". The servo is
Approx. 200
A
B
AD = " appears, press the MENU/NO
)" of " - ( )" is above 20, press the YES
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.
the average value.
C1 error
b c
SAV" is displayed
/ a = ".
/ b = ".
/ c = ".
Focus bias value
(F. BIAS)
a