15.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not rotate the AMS knob.
(Traverse Waveform)
A
VC
B
Specified value : Below 10% offset value
Offset value (%) = IA – BI X 100 2 (A + B)
16.Press the @/1 button and display “EF CD CHECK” (C15).
17.Press the x/Z “PGM” button and remove the check disc (MD)
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. | Oscilloscope | |
| ||
BD board | 330 kΩ | |
CN105 pin 4 (TE) | 10pF | |
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
2.Rotate the AMS knob and display “CPLAY1MODE” (C34).
3.Press the @/1 button and display “CPLAY1 MID”.
4. Press the | x/Z | button when “C = | AD = )” is dis- |
played. |
| ||
5.Rotate the AMS knob and display “FBIAS CHECK” (C16).
6.Press the @/1 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 @/1 button and display “ 
/
b = 
)”. Check that the C1 error is below 100 and ADER is below 2.
8.Press the @/1 button and display “ 
/
a = 
)”. Check that the C1 error is below 100 and ADER is below 2.
9.Press the x/Z button, next press the A button, and remove the test disc.
5-6-8. C PLAY Check
MO Error Rate Check
Checking Procedure :
1.Load a continuously recorded test disc
2.Rotate the AMS knob and display “CPLAY1MODE” (C34).
3.Press the @/1 button and display “CPLAY1 MID”.
4.The display changes to “C = 
AD = 
)”.
5.If the C1 error rate is below 20, check that ADER is 00.
6.Press the x/Z button, stop playback, press the x/Z “PGM” button, and test disc.
CD Error Rate Check
Checking Procedure :
1.Load a check disc (MD)
2.Rotate the AMS knob and display “CPLAY1MODE” (C34).
3.Press the @/1 button twice and display “CPLAY1 MID”.
4.The display changes to “C = 
AD = 
)”.
5.Check that the C1 error rate is below 20.
6.Press the x/Z button, stop playback, press the x/Z “PGM” 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
2.Rotate the AMS knob to display “CREC 1MODE” (C35).
3.Press the @/1 button to display the “CREC1 MID”.
4.When recording starts, “ REC ” is displayed, this becomes “CREC1 (@@@@)” (@@@@ is the address), and recording starts.
5.About 1 minute later, press the x/Z button to stop continuous recording.
6.Rotate the AMS knob to display “CPLAY 1MODE” (C34).
7.Press the @/1 button to display “CPLAY1 MID”.
8.“C = 
AD = 
)” will be displayed.
9.Check that the C1 error becomes below 20 and the AD error below 2.
10.Press the x/Z button to stop playback, and press the x/Z
“PGM” button and remove the disc.
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