Sony HCD-PX5 Service Manual page 42

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[ENTER/YES]
9. Press the button to display "EFB =
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 turn the
knob.
Traverse Waveform
VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[ENTER/YES]
11. Press the button to display "EF MO CHECK"
(C14).
The disc stops rotating automatically.
[MD ]
12. Press the Z button and take out the disc.
13. Load the check disc (TDYS-1).
[ENTER/YES]
14. Turn the knob to display "EF CD CHECK"
(C15).
[ENTER/YES]
15. Press the 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 turn the
knob.
Traverse Waveform
TE
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VC
Specified value : Below 10% offset value
I A – B I
Offset value (%) =
2 (A + B)
[ENTER/YES]
17. Press the button to display "EF CD CHECK"
(C15).
[MD ]
18. Press the button and take out the check disc.
Z
Checking Location: BD (MD) board (see page 47)
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[ENTER/YES]
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[ENTER/YES]
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5-6-7. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Procedure:
1. Load the test disc (MDW-74/GA-1).
[ENTER/YES]
2. Turn the
(C36).
[ENTER/YES]
3. Press the
[MENU/NO]
4. Press the button when "C =
displayed.
[ENTER/YES]
5. Turn the
(C16).
[ENTER/YES]
6. Press the
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.
[ENTER/YES]
7. Press the
Check that the C1 error is about 200 and ADER is below 2.
[ENTER/YES]
8. Press the
Check that the C1 error is about 200 and ADER is below 2.
[MENU/NO]
9. Press the button, then press the
take out the test disc.
5-6-8. C PLAY Check
MO Error Rate Check
Procedure:
1. Load the test disc (MDW-74/GA-1).
[ENTER/YES]
2. Turn the
(C36).
[ENTER/YES]
3. Press the
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3 6 7 1 3 1 5
4. The display changes to "C =
5. If the C1 error rate is below 20, check that ADER is 00.
[MENU/NO]
6. Press the button to stop playback, then press the
[MD ]
Z button and take out the test disc.
CD Error Rate Check
Procedure:
1. Load the check disc (TDYS-1).
[ENTER/YES]
2. Turn the
(C36).
[ENTER/YES]
3. Press the
4. The display changes to "C =
5. Check that the C1 error rate is below 20.
[MENU/NO]
6. Press the button to stop playback, then press the
[MD ]
button and take out the check disc.
Z
5-6-9. 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).
[ENTER/YES]
2. Turn the
(C37).
[ENTER/YES]
3. Press the
4. When recording starts, lights up "
2 @@@@" (@@@@ is the address).
5. About 1 minute later, press the
continuous recording.
[ENTER/YES]
6. Turn the
(C36). co
[ENTER/YES]
7. Press the
8. "C = AD = )" will be displayed.
.
9. Check that the C1 error becomes below 20 and the AD error
below 2.
[MENU/NO]
10. Press the button to stop playback, then press the
[MD ]
Z button and take out the disc.
9 4 2 8
knob to display "CPLAY2MODE"
button to display "CPLAY2MID".
AD =
knob to display "FBIAS CHECK"
button to display " / c =
button to display " / b =
button to display " / a =
[MD ]
button and
Z
knob to display "CPLAY2MODE"
button to display "CPLAY2MID".
0 5 8 2 9 9 4 2 8
AD = )".
knob to display "CPLAY2MODE"
button to display "CPLAY2MID".
AD = )".
knob to display "CREC 2MODE"
button to display "CREC 2MID".
REC " and display "CREC
[MENU/NO]
button to stop
m
knob to display "CPLAY2MODE"
button to display "CPLAY2 MID".
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