Sony hcd-m700, Руководство по обслуживанию, Страница: 38 / 132

38
HCD-M700
9. Press the ENTER/YES “R” button to display “EFB =
MO-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 MD . “R”
or MD
>
“R” button.
Traverse Waveform
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 MD
. “R” or MD > “R” button and display
“EF CD CHECK” (C15).
15. Press the ENTER/YES “R” button to display “EFB = CD”.
Servo is imposed automatically.
16. Observe the waveform of the oscilloscope, and check that the
specified value is satisfied. Do not press the MD . “R”
or MD > “R” button.
Traverse Waveform
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 43)
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 MD
. “R” or MD > “R” button to display
“CPLAY 1MODE” (C34).
3. Press the ENTER/YES “R” button to display “CPLAY 1MID”.
4. Press the MENU/NO “R” button when “C = AD =
)” is displayed.
5. Press the MD . “R” or MD > “R” button to display
“FBIAS CHECK” (C16).
6. Press the ENTER/YES “R” button to 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.
7. Press the ENTER/YES “R” button to display “ / b
= ”.
Check that the C error is about 220 and ADER is below 2.
8. Press the ENTER/YES “R” button to display “ / a
= ”.
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 MD
. “R” or MD > “R” button to display “CPLAY
1MODE” (C34).
3. Press the ENTER/YES “R” button to display “CPLAY 1MID”.
4. The display changes to “C =
AD = )”.
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 MD
. “R” or MD > “R” button to display “CPLAY
1MODE” (C34).
3. Press the ENTER/YES “R” button to display “CPLAY 1MID”.
4. The display changes to “C =
AD = )”.
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 MD
.
“R” or MD
>
“R” button to display
“CREC 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 MD . “R” or MD > “R” button to display “CPLAY
1 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.
A
B
VC
Specified value : Below 10% offset value
Offset value (%) = X 100
I A – B I
2 (A + B)
A
B
VC
Specified value : Below 10% offset value
Offset value (%) = X 100
I
A – B
I
2 (A + B)
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