35
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. Press the
.
or
>
button and display “CPLAY2MODE”.
3. Press the
7
button and display “CPLAY2MID”.
4. The display changes to “C1 =
AD =
”.
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
x
button, stop playback, press the
A
button, and test
disc.
CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Press the
.
or
>
button and display “CPLAY2MODE”.
3. Press the
7
button twice and display “CPLAY2MID”.
4. The display changes to “C1 =
AD =
”.
5. Check that the C1 error rate is below 20.
6. Press the
x
button, stop playback, press the
A
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. Press the
.
or
>
button to display “CREC 2MODE” .
3. Press the
7
button to display the “CREC 2MID”.
4. When recording starts, REC LED is displayed, this becomes
“CREC 2(@@@@)” (@@@@ is the address), and recording
starts.
5. About 1 minute later, press the
x
button to stop
continuous recording.
6. Press the
.
or
>
button to display “CPLAY2MODE” .
7. Press the
7
button to display “CPLAY2MID”.
8. “C1 =
AD =
” will be displayed.
9. Check that the C1 error becomes below 20 and the AD error
below 2.
10. Press the
x
button to stop playback, and press the
A
button
and remove the disc.
330 k
Ω
Oscilloscope
10pF
BD board
CN105 pin
4
(TE)
CN105 pin
6
(VC)
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. Press the
.
or
>
button and display “CPLAY2MODE” .
3. Press the
7
button and display “CPLAY2MID”.
4. Press the
x
button when “C =
AD =
” is displayed.
5. Press the
.
or
>
button and display “FBIAS CHECK” .
6. Press the
7
button and 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.
7. Press the
7
button and display “
/
b =
”.
Check that the C1 error is below 100 and ADER is below 2.
8. Press the
7
button and display “
/
a =
”.
Check that the C1 error is below 100 and ADER is below 2.
9. Press the
x
button, next press the
A
button, and remove the
test disc.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
7
button.
(Traverse Waveform)
17. Press the
7
button and display “EF CD CHECK” .
18. Press the
A
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)
