Sony MDS-JE480 Service Manual Download

Page: 34 / 68

MDS-JE480

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

AMS

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 50.
6. Press the MENU/NO button, stop playback, press the

EJECT

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

AMS

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 50, check that ADER is 2.
6. Press the MENU/NO button, stop playback, press the

EJECT

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

AMS

knob and display “CPLAY1

MODE”.

3. Press the YES button twice and display “CPLAY1 MID”.
4. The display change to “C =

AD =

”.

5. Press the MENU/NO button and display “CPLAY1 MODE”.
6. Rotate the

AMS

knob and display “FBIAS CHECK”.

7. 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 50 and ADER is below 2.

8. Press the YES button and display “

b =

”.

Check that the C error is below 100 and ADER is below 2.

9. Press the YES button and display “

a =

”.

Check that the C error is below 100 and ADER is below 2

10.Press the MENU/NO button, next press the

EJECT 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 9. in the above) or b (step 8. 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

AMS

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

EJECT 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

AMS

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

EJECT button to remove the disc.

www. xiaoyu163. com

QQ 376315150

TEL 13942296513