30
MDS-JE480
5-6-8. C PLAY Check
MO Error Rate Check
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the
l
AMS
L
knob and display “CPLAY1
MODE”.
3. Press the YES button and display “CPLAY1 MID”.
4. The display changes to “C =
AD =
”.
5. If the C error rate is below 50, check that ADER is 2.
6. Press the MENU/NO button, stop playback, press the
A
EJECT
button, and test disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the
l
AMS
L
knob and display “CPLAY1
MODE”.
3. Press the YES button twice and display “CPLAY1 MID”.
4. The display changes to “C =
AD =
”.
5. Check that the C error rate is below 50.
6. Press the MENU/NO button, stop playback, press the
A
EJECT
button, and the test disc.
5-6-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Checking Procedure :
1. Insert a recordable test disc (MDW-74/GA-1) into the unit.
2. Rotate the
l
AMS
L
knob to display “CREC1 MODE”.
3. Press the YES button to display the “CREC1 MID”.
4. When recording starts, “
REC
” is displayed, this becomes
“CREC 1 (@@@@)” (@@@@ is the address), and recording
starts.
5. About 1 minute later, press the MENU/NO button to stop
continuous recording.
6. Rotate the
l
AMS
L
knob to display “C PLAY1 MODE”.
7. Press the YES button to display “C PLAY1 MID”.
8. “C =
AD =
” will be displayed.
9. Check that the C error becomes below 50 and the AD error
below 2.
10. Press the MENU/NO button to stop playback, and press the
A
EJECT button and remove the disc.
5-6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA-1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the
l
AMS
L
knob and display “CPLAY1
MODE”.
3. Press the YES button and display “CPLAY1 MID”.
4. The display change to “C =
AD =
”.
5. Press the MENU/NO button and display “CPLAY1 MODE”.
6. Rotate the
l
AMS
L
knob and display “FBIAS CHECK”.
7. Press the YES button and display “
/
c =
”.
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.
Check that the C error is below 50 and ADER is below 2.
8. Press the YES button and display “
/
b =
”.
Check that the C error is below 100 and ADER is below 2.
9. Press the YES button and display “
/
a =
”.
Check that the C error is below 100 and ADER is below 2.
10.Press the MENU/NO button, next press the
A
EJECT button,
330 k
Ω
Oscilloscope
10pF
BD board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not rotate the
l
AMS
L
knob.
(Traverse Waveform)
17. Press the YES button and display “EF CD CHECK”.
18. Press the
A
EJECT button and remove the check disc (MD)
TDYS-1.
Note 1 : MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
VC
A
B
Specified value : Below 10% offset value
Offset value (%) = X 100
IA – BI
2 (A + B)
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