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5-13. ERROR RATE CHECK
5-13-1. CD Error Rate Check
Checking Procedure :
1. Load a check disc (MD) TDYS-1.
2. Rotate the
l L
knob and display “MD CPLAY MODE”.
3. Press the ENTER/YES button twice and display “MD CPLAY
MID”.
4. The display changes to “MD C1 =
AD =
”.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO button, stop playback, press the
A
but-
ton, and remove the test disc.
5-13-2. MO Error Rate Check
Checking Procedure :
1. Load a test disc (MDW-74/GA-1).
2. Rotate the
l L
knob and display “MD CPLAY MODE”.
3. Press the ENTER/YES button and display “MD CPLAY MID”.
4. The display changes to “MD C1 =
AD =
”.
5. If the C1 error rate is below 50, check that ADER is 00.
6. Press the MENU/NO button, stop playback, press the
A
but-
ton, 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/GA-1).
2. Rotate the
l L
knob and display “MD CPLAY MODE”.
3. Press the ENTER/YES button twice and display “MD CPLAY
MID”.
4. Press the MENU/NO button when “MD C1 =
AD =
”
is displayed.
5. Rotate the
l L
knob and display “MD FBIAS CHECK”.
6. Press the ENTER/YES button and display “MD
/
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 button and display “MD
/
b =
”.
Check that the C1 error is below 220 and ADER is below 2.
8. Press the ENTER/YES button and display “MD
/
a =
”.
Check that the C1 error is below 220 and ADER is below 2
9. Press the MENU/NO button, next press the
A
button, and
remove the continuously recorded 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 pick-up is replaced.
If the adjustment results becomes “Adjust NG!”, the pick-up 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. Rotate the
l L
knob to display “MD AG Set (CD)”.
3. When the ENTER/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 “MD AG Set (CD)”.
4. Press the
A
button to remove the disc.
5-15-2. MO Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Insert the reference disc (MDW-74/GA-1) for recording.
2. Rotate the
l L
knob to display “MD AG Set (MO)”.
3. When the ENTER/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 “MD AG Set (MO)”.
4. Press the
A
button to remove the disc.
