Sony mds-jb730 User Manual
– 25 –
6-4. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load the test disk (MDW-74/AU-1).
2. Turn the
Checking Procedure :
1. Load the test disk (MDW-74/AU-1).
2. Turn the
[ AMS ]
knob to display “CPLAY MODE”
(C30).
3. Press the
[YES]
button twice to display “CPLAY MID”.
4. Press the
[MENU/NO]
button when “C =
AD =
” is
displayed.
5. Turn the
[ AMS ]
knob to display “FBIAS CHECK”
(C05).
6. Press the
[YES]
button 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 50 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 50 and ADER is below 2.
7. Press the
[YES]
button to display “
/
b =
”.
Check that the C1 error is about 200 and ADER is below 2.
8. Press the
[YES]
button to display “
/
a =
”.
Check that the C1 error is about 200 and ADER is below 2.
9. Press the
[MENU/NO]
button, then press the
[EJECT ]
but-
ton and take out the test disc.
6-5. C PLAY Checking
MO Error Rate Check
Checking Procedure :
1. Load the test disk (MDW-74/AU-1).
2. Turn the
1. Load the test disk (MDW-74/AU-1).
2. Turn the
[ AMS ]
knob to display “CPLAY MODE”
(C30).
3. Press the
[YES]
button to display “CPLAY MID”.
4. The display changes to “C =
AD =
”.
5. If the C1 error rate is below 80, check that ADER is below 2.
6. Press the
6. Press the
[MENU/NO]
button to stop playback, then press the
[EJECT ]
button and take out the test disc.
CD Error Rate Check
Checking Procedure :
1. Load the check disc (MD) TDYS-1.
2. Turn the
1. Load the check disc (MD) TDYS-1.
2. Turn the
[ AMS ]
knob to display “CPLAY MODE”
(C30).
3. Press the
[YES]
button twice to display “CPLAY MID”.
4. The display changes to “C =
AD =
”.
5. Check that the C1 error rate is below 50.
6. Press the
6. Press the
[MENU/NO]
button to stop playback, then press the
[EJECT ]
button and take out the check disc.
6-6. 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. Turn the
1. Load a recordable disc (blank disc).
2. Turn the
[ AMS ]
knob to display “CREC MODE”
(C31).
3. Press the
[YES]
button to display “CREC MID”.
4. When recording starts, light up “
REC
” and display “CREC
@@@@” (@@@@ is the address).
5. About 1 minute later, press the
[MENU/NO]
button to stop
continuous recording.
6. Turn the
[ AMS ]
knob to display “CPLAY
MODE” (C30).
7. Press the
[YES]
button to display “CPLAY MID”.
8. “C =
AD =
” will be displayed.
9. Check that the C1 error becomes below 80 and the AD error
below 2.
10. Press the
[MENU/NO]
button to stop playback, then press the
[EJECT ]
button and take out the disc.
9. Press the
[YES]
button 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 turn the
[ AMS ]
knob.
Traverse Waveform
11. Press the
[YES]
button to display “EF MO CHECK”
The disc stops rotating automatically.
12. Press the
[EJECT ]
button and take out the disc.
13. Load the check disc (MD) TDYS-1.
14. Turn the
14. Turn the
[ AMS ]
knob and display “EF CD CHECK”
(C04).
15. Press the
[YES]
button 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 turn the
[ AMS ]
knob.
Traverse Waveform
17. Press the
[YES]
button to display “EF CD CHECK”.
18. Press the
[EJECT ]
button and take out the check 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)
§
§
±
≠
±
≠
§
±
≠
§
±
≠
±
≠
§
±
≠