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9. Press the
ENTER/YES "R"
P".
Then, the optical pick-up moves to the pit area automatically
and servo is imposed.
10. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
or
button.
M > "R"
Traverse Waveform
VC
Specified value : Below 10% offset value
Offset value (%) =
2 (A + B)
11. Press the
ENTER/YES "R"
(C14).
The disc stops rotating automatically.
[MD ]
12. Press the
Z
button and take out the disc.
13. Load the check disc (TDYS-1).
14. Press the
. m "R"
"EF CD CHECK" (C15).
15. Press the
ENTER/YES "R"
Servo is imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
or
button.
M > "R"
Traverse Waveform
VC
Specified value : Below 10% offset value
Offset value (%) =
2 (A + B)
17. Press the
ENTER/YES "R"
(C15).
[MD ]
18. Press the
button and take out the check disc (TDYS-
Z
1).
Checking Location: BD (MD) board (see page 47)
42
button to display "EFB =
. m "R"
A
B
IA – BI
X 100
button to display "EF MO CHECK"
or
button and display
M > "R"
button to display "EFB =
. m "R"
A
B
IA – BI
X 100
button to display "EF CD CHECK"
MO-
6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the
. m "R"
"CPLAY2MODE" (C36).
3. Press the
ENTER/YES "R"
4. Press the
MENU/NO "R"
displayed.
5. Press the
. m "R"
"FBIAS CHECK" (C16).
6. Press the
ENTER/YES "R"
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
ENTER/YES "R"
Check that the C1 error is about 200 and ADER is below 2.
8. Press the
ENTER/YES "R"
Check that the C1 error is about 200 and ADER is below 2.
9. Press the
MENU/NO "R"
and take out the test disc.
6-8. C PLAY Check
CD".
MO Error Rate Check
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the
. m "R"
"CPLAY2MODE" (C36).
3. Press the
ENTER/YES "R"
4. The display changes to "C =
5. If the C1 error rate is below 20, check that ADER is 00.
6. Press the
MENU/NO "R"
[MD ]
the
Z
button and take out the test disc.
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the
. m "R"
"CPLAY2MODE" (C36).
3. Press the
ENTER/YES "R"
4. The display changes to "C =
5. Check that the C1 error rate is below 20.
6. Press the
MENU/NO "R"
[MD ]
the
button and take out the check disc.
Z
6-9. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired
and check the error rate.
Procedure:
1. Load a recordable disc (blank disc).
2. Press the
. m "R"
"CREC 2MODE" (C37).
3. Press the
ENTER/YES "R"
4. When recording starts, lights up "
2 @@@@" (@@@@ is the address).
5. About 1 minute later, press the
continuous recording.
6. Press the
. m "R"
"CPLAY2MODE" (C36).
7. Press the
ENTER/YES "R"
8. "C =
AD =
9. Check that the C1 error becomes below 20 and the AD error
below 2.
10. Press the
MENU/NO "R"
[MD ]
the
Z
button and take out the disc.
or
button to display
M > "R"
button to display "CPLAY2MID".
button when "C =
or
button to display
M > "R"
button to display "
button to display "
button to display "
[MD ]
button, then press the
or
button to display
M > "R"
button to display "CPLAY2MID".
AD =
)".
button to stop playback, then press
or
button to display
M > "R"
button to display "CPLAY2MID".
AD =
)".
button to stop playback, then press
or
M > "R"
button to display
button to display "CREC 2MID".
REC
" and display "CREC
button to stop
MENU/NO "R"
or
M > "R"
button to display
button to display "CPLAY2 MID".
)" will be displayed.
button to stop playback, then press
AD =
)" is
/
c =
".
/
b =
".
/
a =
".
button
Z
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