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MDS-NT1
[ENTER/YES]
9. Click the
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 click the
[JOG DOWN]
.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[ENTER/YES]
11. Click the
to display "EF MO CHECK (C14)".
The disc stops rotating automatically.
[EJECT]
12. Click the
button and take out the disc.
13. Load the check disc (MD) TDYS-1.
[JOG UP]
[JOG DOWN]
14. Click the
or
CHECK" (C15).
[ENTER/YES]
15. Click the
to display "EFB =
imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not click the
[JOG DOWN]
.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[ENTER/YES]
17. Click the
to display "EF CD CHECK" (C15).
[EJECT]
18. Click the
and take out the check disc (MD) TDYS-1.
Check Location: BD board (see page 35)
30
MO-P".
[JOG UP]
or
A
B
X 100
and display "EF CD
CD". Servo is
[JOG UP]
or
A
B
X 100
5-7-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure:
1. Load the test disk (MDW-74/GA-1).
[JOG UP]
[JOG DOWN]
2. Click the
or
MODE" (C36).
[ENTER/YES]
3. Click the
to display "CPLAY2MID".
[MENU/NO]
4. Click the
when "C =
[JOG UP]
5. Click the
or
CHECK" (C16).
[ENTER/YES]
6. Click the
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.
[ENTER/YES]
7. Click the
to display "
Check that the C1 error is about 100 and ADER is below 2.
[ENTER/YES]
8. Click the
to display "
Check that the C1 error is about 100 and ADER is below 2.
[MENU/NO]
9. Click the
, then click the
test disc.
5-7-8. C PLAY Check
MO Error Rate Check
Checking Procedure:
1. Load the test disk (MDW-74/GA-1).
[JOG UP]
[JOG DOWN]
2. Click the
or
MODE" (C36).
[ENTER/YES]
3. Click the
to display "CPLAY2MID".
4. The display changes to "C =
5. If the C1 error rate is below 20, check that ADER is 00.
[MENU/NO]
6. Click the
[EJECT]
and take out the test disc.
CD Error Rate Check
Checking Procedure:
1. Load the check disc (MD) TDYS-1.
[JOG UP]
[JOG DOWN]
2. Click the
or
MODE" (C36).
[ENTER/YES]
3. Click the
to display "CPLAY2MID".
4. The display changes to "C =
5. Check that the C1 error rate is below 20.
[MENU/NO]
6. Click the
[EJECT]
and take out the check disc.
5-7-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Checking Procedure:
1. Load a recordable disc (blank disc).
[JOG UP]
[JOG DOWN]
2. Click the
or
"CREC 2MODE" (C37).
[ENTER/YES]
3. Click the
to display "CREC 2MID".
4. When recording starts and display "CREC 2 @@@@" (@@@@
is the address).
5. About 1 minute later, click the
ous recording.
[JOG UP]
[JOG DOWN]
6. Click the
or
MODE" (C36).
[ENTER/YES]
7. Click the
to display "CPLAY2MID".
8. "C =
AD =
" will be displayed.
9. Check that the C1 error becomes below 20 and the AD error
below 2.
[MENU/NO]
10. Click the
[EJECT]
and take out the disc.
to display "CPLAY2
AD =
" is displayed.
[JOG DOWN]
to display "FBIAS
/
c =
".
/
b =
".
/
a =
".
[EJECT]
and take out the
to display "CPLAY2
AD =
".
to stop playback, then Click the
to display "CPLAY2
AD =
".
to stop playback, then click the
to display
[MENU/NO]
to stop continu-
to display "CPLAY2
to stop playback, then click the
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