Table of Contents
Advertisement
9. Press the ENTER/YES "R" button to display "EFB =
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
"R" button.
>
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
11. Press the ENTER/YES "R" button to display "EF MO CHECK"
(C14).
The disc stops rotating automatically.
12. Press the Z MD button and take out the disc.
13. Load the check disc (TDYS-1).
14. Press the
"R" or
.
>
CHECK" (C15).
15. Press the ENTER/YES "R" button to display "EFB =
Servo is imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the
>
"R" button.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
17. Press the ENTER/YES "R" button to display "EF CD CHECK"
(C15).
18. Press the Z MD button and take out the check disc (TDYS-1).
Checking Location: BD board (see page 40)
MO-
"R" or
.
A
B
X 100
"R" button and display "EF CD
CD".
.
"R" or
A
B
X 100
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
"R" or
.
>
1MODE" (C34).
3. Press the ENTER/YES "R" button to display "CPLAY 1MID".
4. Press the MENU/NO "R" button when "C =
is displayed.
5. Press the
.
"R" or
>
CHECK" (C16).
6. Press the ENTER/YES "R" button to display "
".
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.
7. Press the ENTER/YES "R" button to display "
".
Check that the C error is about 220 and ADER is below 2.
8. Press the ENTER/YES "R" button to display "
Check that the C error is about 220 and ADER is below 2.
9. Press the MENU/NO "R" button, then press the Z MD button
and take out the test disc.
6-8. C PLAY Check
MO Error Rate Check
Procedure:
1. Load the test disc (MDW-74/GA-1).
2. Press the
"R" or
.
>
1MODE" (C34).
3. Press the ENTER/YES "R" button to display "CPLAY 1MID".
4. The display changes to "C =
5. If the C error rate is below 20, check that ADER is 00.
6. Press the MENU/NO "R" button to stop playback, then press
the Z MD button and take out the test disc.
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
2. Press the
"R" or
.
>
1MODE" (C34).
3. Press the ENTER/YES "R" button to display "CPLAY 1MID".
4. The display changes to "C =
5. Check that the C error rate is below 20.
6. Press the MENU/NO "R" button to stop playback, then press
the Z MD button and take out the check disc.
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
"R" or
.
>
1MODE" (C35).
3. Press the ENTER/YES "R" button to display "CREC 1MID".
4. When recording starts, lights up " MD " and display "CREC 1
@@@@" (@@@@ is the address).
5. About 1 minute later, press the MENU/NO "R" button to stop
continuous recording.
6. Press the
"R" or
.
>
MODE" (C34).
7. Press the ENTER/YES "R" button to display "CPLAY 1MID".
8. "C =
AD =
)" will be displayed.
9. Check that the C error becomes below 20 and the AD error
below 2.
10. Press the MENU/NO "R" button to stop playback, then press
the Z MD button and take out the disc.
HCD-M10
"R" button to display "CPLAY
AD =
"R" button to display "FBIAS
/
c =
/
/
a =
"R" button to display "CPLAY
AD =_ _ )".
"R" button to display "CPLAY
AD =
)".
"R" button to display "CREC
"R" button to display "CPLAY 1
)"
b =
".
35
Advertisement
Table of Contents
