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9. Press the [ENTER/START] button to display "EFB =
P".
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 press the MD
MD
button.
>
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
11. Press the [MODE] button to display "EF MO CHECK" (C14).
The disc stops rotating automatically.
12. Press the Z MD button and take out the disc.
13. Load the check disc (TDYS-1).
14. Press the MD
or MD
.
CHECK" (C15).
15. Press the [ENTER/START] button to display "EFB =
Servo is imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the MD
MD
button.
>
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
17. Press the [MODE] button to display "EF CD CHECK" (C15).
18. Press the Z MD button and take out the check disc (TDYS-1).
Checking Location: BD board (see page 40)
MO-
.
A
B
X 100
>
button and display "EF CD
CD".
.
A
B
X 100
6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the MD
.
2MODE" (C36).
or
3. Press the [ENTER/START] button to display "CPLAY 2MID".
4. Press the [MODE] button when "C =
displayed.
5. Press the MD
.
CHECK" (C16).
6. Press the [ENTER/START] button to display "
=
".
The first four digits indicate the C error rate, the two digits after
[/] indicate ADER, and the 2 digits after [c =] indicate the focus
bias value.
7. Press the [ENTER/START] button to display "
".
Check that the C error is about 220 and ADER is below 2.
8. Press the [ENTER/START] button to display "
".
Check that the C error is about 220 and ADER is below 2.
9. Press the [MODE] button, then press the Z MD button and take
out the test disc.
6-8. C Play Check
MO Error Rate Check
or
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the MD
.
2MODE" (C36).
3. Press the [ENTER/START] button to display "CPLAY 2MID".
4. The display changes to "C =
5. If the C error rate is below 20, check that ADER is 00.
6. Press the [MODE] button to stop playback, then press the
Z MD button and take out the test disc.
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the MD
.
(C36).
3. Press the [ENTER/START] button to display "CPLAY 2MID".
4. The display changes to "C =
5. Check that the C error rate is below 20.
6. Press the [MODE] button to stop playback, then press the
Z MD button and take out the check disc.
6-9. 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).
2. Press the MD
.
"CREC 2MODE" (C37).
3. Press the [ENTER/START] button to display "CREC 2MID".
4. When recording starts, lights up "
(@@@@)" (@@@@ is the address).
5. About 1 minute later, press the [MODE] button to stop continuous
recording.
6. Press the MD
.
MODE" (C36).
7. Press the [ENTER/START] button to display "CPLAY 2MID".
8. "C =
AD =
9. Check that the C error becomes below 20 and the AD error
below 2.
10. Press the [MODE] button to stop playback, then press the
Z MD button and take out the disc.
MDS-SE9
or MD
button to display "CPLAY
>
AD =
or MD
button to display "FBIAS
>
or MD
button to display "CPLAY
>
AD =
or MD
button to display "CPLAY 2MODE"
>
AD =
)".
or MD
button to display
>
" and display "CREC 2
REC
or MD
>
button to display "CPLAY 2
)" will be displayed.
)" is
/
c
/
b =
/
a =
)".
35
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