28
MDS-JB980
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”
(C34).
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/GA1) into the unit.
2. Rotate the
l
AMS
L
knob to display “CREC 1MODE”
(C35).
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 “CPLAY1MODE”
(C34).
7. Press the YES button to display “C PLAY 1MID”.
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.
5-7. INITIAL SETTING OF ADJUSTMENT VALUE
Note:
Mode which sets the adjustment results recorded in the non-vola-
tile memory to the initial setting value. However the results of the
temperature compensation offset adjustment will not change to the
initial setting value.
If initial setting is performed, perform all adjustments again ex-
cluding the temperature compensation offset adjustment.
For details of the initial setting, refer to “5-4. Precautions on Ad-
justments” and execute the initial setting before the adjustment as
required.
Setting Procedure :
1. Rotate the
l
AMS
L
knob to display “ADJ CLEAR”
(C28).
2. Press the YES button. “Complete!” will be displayed momen-
tarily and initial setting will be executed, after which “ADJ
CLEAR” (C28) will be displayed.
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/GA1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the
l
AMS
L
knob and display “CPLAY1
MODE”(C34).
3. Press the YES button and display “CPLAY1 MID”.
4. The display change to “C =
AD =
”.
5. Press the MENU/NO button.
6. Rotate the
l
AMS
L
knob and display “FBIAS CHECK”
(C16).
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 220 and ADER is below 2.
10.Press the MENU/NO button, next press the
A
EJECT button,
and remove the test disc.
5-6-8. C PLAY Check
MO Error Rate Check
Checking Procedure :
1. Load a continuously recorded test disc (MDW-74/GA1).
(Refer to “5-5. Using the Continuously Recorded Disc”.)
2. Rotate the
l
AMS
L
knob and display “CPLAY1 MODE”
(C34).
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 00.
6. Press the MENU/NO button, stop playback, press the
A
EJECT
button, and test disc.
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” (C15).
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
I
A – BI
2 (A + B)
