Sony MDS-JB940 Service Manual page 29

5-12. TRAVERSE ADJUSTMENT
Connection:
BD board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
Adjusting Procedure:
1. Connect an oscilloscope to CN105 pin 4 (TE) and CN105
pin 6 (VC) on the BD board.
2. Load a recordable test disc (MDW-74/GA-1).
3. Press the M button to move the optical pick-up outside the
pit.
Turn the l AMS L knob to display "EF MO ADJUS"
4.
(C07).
5. Press the YES button to display "EFB =
Turn the l AMS L knob so that the waveform of the
6.
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
MO-R" 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.
Traverse Waveform
VC
Specification A = B
7. Press the YES button and save the result of adjustment to the
non-volatile memory ("EFB =
moment. Then "EFB =
Turn the l AMS L knob so that the waveform of the
8.
oscilloscope becomes the specified value.
(When the l AMS L knob is turned, the
MO-W" 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.
Traverse Waveform
VC
Specification A = B
9. Press the YES button, and save the adjustment results in the
non-volatile memory. ("EFB =
a moment)
10. "EFB = MO-P" will be displayed.
The optical pick-up moves to the pit area automatically and
servo is imposed.
Oscilloscope
(DC range)
+
V: 0.1 V/div
–
H: 10 ms/div
MO-R".
of "EFB=
A
B
SAV" will be displayed for a
MO-W" will be displayed).
of "EFB-
A
B
SAV" will be displayed for
11. Turn the l AMS 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
VC
Specification A = B
12. Press the YES button, and save the adjustment results in the
non-volatile memory. ("EFB =
a moment.)
Next "EF MO ADJUS" is displayed. The disc stops rotating
automatically.
13. Press the EJECT A button and take out the disc.
14. Load the check disc (MD) TDYS-1.
15. Turn the l AMS L knob to display "EF CD ADJUS"
(C08).
16. Press the YES button to display "EFB =
imposed automatically.
17. Turn the l AMS 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
VC
Specification A = B
18. Press the YES button, display "EFB =
and save the adjustment results in the non-volatile memory.
Next "EF CD ADJUS" will be displayed.
19. Press the EJECT A button and take out the test disc TDYS-1.
A
B
SAV" will be displayed for
CD". Servo is
A
B
SAV" for a moment
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