Sony HCD-MD373 Error Rate Check, Focus Bias Check, Auto Gain Control Output Level Adjustment

5-13. ERROR RATE CHECK

5-13-1. CD Error Rate Check

Checking Procedure :

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

2.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “CPLAY MODE”.

3.Press the ENTER/YES “R” button twice and display “CPLAY MID”.

4.The display changes to “C1 = AD = ”.

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

6. Press the MENU/NO “R” button, stop playback, press the 6 (MD) button, and remove the test disc.

5-13-2. MO Error Rate Check

Checking Procedure :

1.Load a test disc (MDW-74/AU-1).

2.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “CPLAY MODE”.

3.Press the ENTER/YES “R” button and 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 “R” button, stop playback, press the 6 (MD) button, and remove the test disc.

5-14. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.

Checking Procedure :

1.Load a test disc (MDW-74/AU-1).

2.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “CPLAY MODE”.

3.Press the ENTER/YES “R” button twice and display “CPLAY MID”.

4. Press the	MENU/NO “R”	button when “C1 =	AD = ”
is displayed.

5.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button and display “FBIAS CHECK”.

6.	Press the ENTER/YES “R” 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 50 and ADER is below 2.
7.	Press the		ENTER/YES “R”		button and display “	/		b =
	”.
	Check that the C1 error is below 220 and ADER is below 2.
8.	Press the		ENTER/YES “R”		button and display “	/		a =
	”.
	Check that the C1 error is below 220 and ADER is below 2
9.	Press the	MENU/NO “R”		button, next press the		6(MD)	but-
	ton, and remove the test disc.

Note 1 : If the C1 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.

5-15. AUTO GAIN CONTROL OUTPUT LEVEL ADJUSTMENT

Be sure to perform this adjustment when the pickup is replaced. If the adjustment results becomes “Adjust NG!”, the pickup may be faulty or the servo system circuits may be abnormal.

5-15-1. CD Auto Gain Control Output Level Adjustment

Adjusting Procedure :

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

2.Press the =0/MD/CD/TUNING – button or )+/ MD/CD/TUNING + button to display “AG Set (CD)”.

3.When the ENTER/YES “R” 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 6(MD) button to remove the disc.

5-15-2. MO Auto Gain Control Output Level Adjustment

Adjusting Procedure :

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

2.Press the =0/MD/CD/TUNING – button to display “AG Set (MO)”.

3.When the ENTER/YES “R” 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 6(MD) button to remove the disc.

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