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