Sony MDS-S50 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

MDS-JE470

5-14. ERROR RATE CHECK

5-14-1. CD Error Rate Check

Checking Procedure :

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

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button twice and display “CPLAY1 MID”.

4.The display changes to “C = AD = ”.

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

6.Press the MENU/NO button, stop playback, press the AEJECT button, and remove the test disc.

5-14-2. MO Error Rate Check

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button and display “CPLAY1 MID”.

4.The display changes to “C = AD = ”.

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

6.Press the MENU/NO button, stop playback, press the AEJECT button, and remove the test disc.

5-15. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1.Load a continuously recorded test disc (MDW-74/GA-1). (Refer to “5-5. Using the Continuously Recorded Disc”.)

2.Rotate the l AMS L knob and display “CPLAY1 MODE”.

3.Press the YES button twice and display “CPLAY1 MID”.

4. Press the	MENU/NO	button when “C =	AD = ” is
displayed.

5.Rotate the lAMS L knob and display “FBIAS CHECK”.

6.Press the YES button and display “ / c = ”.

The first four digits indicate the C error rate, the two digits after [/] indicate ADR, and the 2 digits after [c =] indicate the focus bias value.

Check that the C error is below 20 and ADER is below 2.

7.Press the YES button and display “ / b = ”. Check that the C error is below 100 and ADER is below 2.

8.Press the YES button and display “ / a = ”. Check that the C error is below 100 and ADER is below 2

9.Press the MENU/NO button, next press the AEJECT button, and remove the continuously recorded disc.

Note 1 : If the C error and ADER are above other than the speci- fied 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 properly. Adjust perform the beginning again.

5-16. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the Optical pick-up is re- placed.

If the adjustment results becomes “Adjust NG!”, the Optical pick- up may be faulty or the servo system circuits may be abnormal.

5-16-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure :

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

2.Rotate the lAMS L knob to display “AG Set (CD)”.

3.When the YES button is pressed, 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)”.

4.Press the AEJECT button to remove the disc.

5-16-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure :

1.Insert the reference disc (MDW-74/GA-1) for recording.

2.Rotate the lAMS L knob to display “AG Set (MO)”.

3.When the YES button is pressed, 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)”.

4.Press the AEJECT button to remove the disc.

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