9.Press the [YES] button to display “EFB = 
Then, the optical
10.Observe the waveform of the oscilloscope, and check that the specified value is satisfied. Do not turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.
Traverse Waveform
A
VC
B
Specified value : Below 10% offset value
Offset value (%) = IA – BI X 100 2 (A + B)
11.Press the [YES] button to display “EF MO CHECK” The disc stops rotating automatically.
12.Press the [ÊÊÊÊÊEJECT]¤ button and take out the disc.
13.Load the check disc (MD)
14.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob and display “EF CD CHECK” (C04).
15.Press the [YES] 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 turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob.
Traverse Waveform
A
VC
B
Specified value : Below 10% offset value
Offset value (%) = IA – BI X 100 2 (A + B)
17.Press the [YES] button to display “EF CD CHECK”.
18.Press the [ÊÊÊÊÊEJECT]¤ button and take out the check disc.
6-4. Focus Bias Check
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1.Load the test disk
2.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “CPLAY MODE” (C30).
3.Press the [YES] button twice to display “CPLAY MID”.
4.Press the [MENU/NO] button when “C = 
AD = 
” is displayed.
5.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “FBIAS CHECK” (C05).
6.Press the [YES] button to 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 50 and ADER is below 2.
7.Press the [YES] button to display “ 
/
b = 
”.
Check that the C1 error is about 200 and ADER is below 2.
8.Press the [YES] button to display “ 
/
a = 
”.
Check that the C1 error is about 200 and ADER is below 2.
9.Press the [MENU/NO] button, then press the [ÊÊÊÊÊEJECT]¤ but- ton and take out the test disc.
6-5. C PLAY Check
MO Error Rate Check
Checking Procedure :
1.Load the test disk
2.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “CPLAY MODE” (C30).
3.Press the [YES] button to display “CPLAY MID”.
4.The display changes to “C = 
AD = 
”.
5.If the C1 error rate is below 80, check that ADER is below 2.
6.Press the [MENU/NO] button to stop playback, then press the [ÊÊÊÊÊEJECT]¤ button and take out the test disc.
CD Error Rate Check
Checking Procedure :
1.Load the check disc (MD)
2.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “CPLAY MODE” (C30).
3.Press the [YES] button twice to display “CPLAY MID”.
4.The display changes to “C = 
AD = 
”.
5.Check that the C1 error rate is below 50.
6.Press the [MENU/NO] button to stop playback, then press the [ÊÊÊÊÊEJECT]¤ button and take out the check disc.
6-6. Self-Recording/playback Check
Prepare a continuous recording disc using the unit to be repaired and check the error rate.
Checking Procedure :
1.Load a recordable disc (blank disc).
2.Turn the [ÊÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊÊ]- ± knob to display “CREC MODE” (C31).
3.Press the [YES] button to display “CREC MID”.
4. When recording starts, light up “ REC ” and display “CREC
@@@@” (@@@@ is the address).
5.About 1 minute later, press the [MENU/NO] button to stop continuous recording.
6.Turn the [ÊÊÊÊÊÊÊAMSÊÊÊÊÊÊÊ]- ± knob to display “CPLAY MODE” (C30).
7.Press the [YES] button to display “CPLAY MID”.
8.“C = 
AD = 
” will be displayed.
9.Check that the C1 error becomes below 80 and the AD error below 2.
10.Press the [MENU/NO] button to stop playback, then press the [ÊÊÊÊÊEJECT]¤ button and take out the disc.
