Error Rate Check, Focus Bias Check

MDS-NT1

5-15. ERROR RATE CHECK

5-15-1. CD Error Rate Check

Checking Procedure:

1.Load the check disc (MD) TDYS-1.

2.Click the [JOG UP] or [JOG DOWN] to display “CPLAY2 MODE” (C36).

3.Click the [ENTER/YES] twice and display “CPLAY2MID”.

4.The display changes to “C = AD = ”.

5.Check that the C1 error rate is below 20.

6.Click the [MENU/NO] to stop playback, then click the [EJECT] and take out the check disc.

5-15-2. MO Error Rate Check

Checking Procedure:

1.Load the continuously-recorded disc. (Refer to “5-6. USING THE CONTINUOUSLY RECORDED DISC”)

2.Click the [JOG UP] or [JOG DOWN] to display “CPLAY2 MODE” (C36).

3.Click the [ENTER/YES] to display “CPLAY2MID”.

4.The display changes to “C = AD = ”.

5.If the C1 error rate is below 20, check that ADER is 00.

6.Click the [MENU/NO] to stop playback, then click the [EJECT] and take out the test disc.

5-16. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Procedure:

1.Load the continuously-recorded disc. (Refer to “5-6. USING THE CONTINUOUSLY RECORDED DISC”)

2.Click the [JOG UP] or [JOG DOWN] to display “CPLAY2 MODE” (C36).

3.Click the [ENTER/YES] twice to display “CPLAY2MID”.

4.Click the [MENU/NO] when “C = AD = ” is displayed.

5.Click the [JOG UP] or [JOG DOWN] to display “FBIAS CHECK” (C16).

6.Click the [ENTER/YES] 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 20 and ADER is below 2.

7.Click the [ENTER/YES] and display “ / b = ”. Check that the C1 error is about 100 and ADER is below 2.

8.Click the [ENTER/YES] and display “ / a = ”. Check that the C1 error is about 100 and ADER is below 2

9.Click the [MENU/NO], then click the [EJECT] and take out the disc.

Note: 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.

5-17. 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.

5-17-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure:

1.Load the check disc (MD) TDYS-1.

2.Click the [JOG UP] or [JOG DOWN] to display “AG Set (CD)” (C11).

3.When the [ENTER/YES] is clicked, the adjustment will be performed 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)” (C11).

4.Click the [EJECT] and take out the check disc.

5-17-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure:

1.Load the test disc (MDW-74/GA-1).

2.Click the [JOG UP] or [JOG DOWN] to display “AG Set (MO)” (C10).

3.When the [ENTER/YES] is clicked, the adjustment will be performed 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)” (C10).

4.Click the [EJECT] and take out the test disc.