Service manual

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13. ERROR RATE CHECK
13-1. CD Error Rate Check
Checking Procedure :
1. Load the check disc (MD) TDYS-1.
2. Turn the [AMS] knob and display “CPLAY MODE”
(C30).
3. Press the [YES] button twice and display “CPLAY MID”.
4. The display changes to “C = AD = ”.
5. Check that the C1 error rate is below 20.
6. Press the [MENU/NO] button to stop playback, then press the
[EJECT] button and take out the check disc.
13-2. MO Error Rate Check
Checking Procedure :
1. Load the continuously-recorded disc. (Refer to “5. CREAT-
ING CONTINUOUSLY-RECORDED DISC”)
2. Turn the [AMS] knob to display “CPLAY MODE”
(C30).
3. Press the [YES] button to display “CPLAY MID”.
4. The display changes to “C1 = AD = ”.
5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the [MENU/NO] button to stop playback, then press the
[EJECT] button and take out the test disc.
14. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load the continuously-recorded disc. (Refer to “5. CREAT-
ING CONTINUOUSLY-RECORDED DISC”)
2. Turn the [AMS] 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 [AMS] 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 and display “ / b = ”.
Check that the C1 error is about 200 and ADER is below 2.
8. Press the [YES] button and display “ / a = ”.
Check that the C1 error is about 200 and ADER is below 2
9. Press the [MENU/NO] button, then press the [EJECT] but-
ton and take out the disc.
Note 1: If the C1 error and ADER are above other than the specified
value at points A (step 8. in the above) or B (step 7. in the above),
the focus bias adjustment may not have been carried out prop-
erly. Adjust perform the beginning again.
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15. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the optical pick-up is
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
15-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Load the check disc (MD) TDYS-1.
2. Turn the [AMS] knob to display “AG Set (CD)” (C26).
3. When the [YES] button is pressed, the adjustment will be per-
formed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (CD)”.
4. Press the [EJECT] button and take out the check disc.
15-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Load the test disc (MDW-74/AU-1).
2. Turn the [AMS] knob to display “AG Set (MO)”
(C25).
3. When the [YES] button is pressed, the adjustment will be per-
formed automatically.
“Complete!!” will then be displayed momentarily when the
value is recorded in the non-volatile memory, after which the
display changes to “AG Set (MO)”.
4. Press the [EJECT] button and take out the test disc.
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