Table of Contents
Advertisement
[YES]
9. Press the
button to display "EFB =
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[YES]
11. Press the
button to display "EF MO CHECK" (C14).
The disc stops rotating automatically.
12. Press the
Z
button and take out the disc.
13. Load the check disc (TDYS-1).
[
AMS
]
14. Turn the
.
>
(C15).
[YES]
15. Press the
button to display "EFB =
imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not turn the
knob.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[YES]
17. Press the
button to display "EF CD CHECK" (C15).
18. Press the
Z
button and take out the check disc (TDYS-1).
Checking Location: BD board (see page 30)
MO-P".
[
AMS
.
>
A
B
X 100
knob to display "EF CD CHECK"
CD". Servo is
[
AMS
.
>
A
B
X 100
5-7-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the test disc (MDW-74/GA-1).
]
[
AMS
2. Turn the
.
(C34).
[YES]
3. Press the
button to display "CPLAY1MID".
[MENU/NO]
4. Press the
displayed.
[
AMS
5. Turn the
.
(C16).
[YES]
6. Press the
button to 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 20 and ADER is below 2.
[YES]
7. Press the
button to display "
Check that the C1 error is about 100 and ADER is below 2.
[YES]
8. Press the
button to display "
Check that the C1 error is about 100 and ADER is below 2.
[MENU/NO]
9. Press the
out the test disc (MDW-74/GA-1).
5-7-8. C PLAY Check
MO Error Rate Check
]
Procedure:
1. Load the test disc (MDW-74/GA-1).
[
AMS
2. Turn the
.
(C34).
[YES]
3. Press the
button to display "CPLAY1MID".
4. The display changes to "C =
5. If the C1 error rate is below 20, check that ADER is 00.
[MENU/NO]
6. Press the
the
Z
button and take out the test disc (MDW-74/GA-1).
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
[
AMS
2. Turn the
.
(C34).
[YES]
3. Press the
button to display "CPLAY1MID".
4. The display changes to "C =
5. Check that the C1 error rate is below 20.
[MENU/NO]
6. Press the
the
button and take out the check disc (TDYS-1).
Z
5-7-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Procedure:
1. Load a recordable disc (blank disc).
[
AMS
2. Turn the
.
(C35).
[YES]
3. Press the
button to display "CREC 1MID".
4. When recording starts, lights up "
1 (@@@@)" (@@@@ is the address).
5. About 1 minute later, press the
continuous recording.
[
AMS
6. Turn the
.
(C34).
[YES]
7. Press the
button to display "CPLAY1MID".
8. "C =
AD =
9. Check that the C1 error becomes below 20 and the AD error
below 2.
[MENU/NO]
10. Press the
the
Z
button and take out the disc.
MDS-S9
]
>
knob to display "CPLAY1MODE"
button when "C =
AD =
]
>
knob to display "FBIAS CHECK"
/
c =
/
b =
/
a =
button, then press the
Z
button and take
]
>
knob to display "CPLAY1MODE"
AD =
)".
button to stop playback, then press
]
>
knob to display "CPLAY1MODE"
AD =
)".
button to stop playback, then press
]
>
knob to display "CREC 1MODE"
REC
" and display "CREC
[MENU/NO]
button to stop
]
>
knob to display "CPLAY1MODE"
)" will be displayed.
button to stop playback, then press
)" is
".
".
".
25
Advertisement
Table of Contents
