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MDS-JB980
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/GA1).
(Refer to "5-5. Using the Continuously Recorded Disc".)
2. Rotate the l AMS L knob and display "CPLAY 1MODE"
(C34).
3. Press the YES button twice and display "CPLAY1 MID".
4. The display change to "C =
5. Press the MENU/NO button.
6. Rotate the l AMS L knob and display "FBIAS CHECK"
(C16).
7. Press the YES button and display "
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 "
Check that the C error is below 100 and ADER is below 2.
9. Press the YES button and display "
Check that the C error is below 100 and ADER is below 2
10.Press the MENU/NO button, next press the A 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 l AMS L knob to display "AG Set (CD)"
(C11).
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)" (C11).
4. Press the A 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 l AMS L knob to display "AG Set (MO)"
(C10).
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)" (C10).
4. Press the A EJECT button to remove the disc.
32
AD =
".
/
c =
".
/
b =
".
/
a =
".
5-17. ADJUSTING POINTS AND CONNECTING
POINTS
[BD BOARD] (SIDE A)
D101
CN101
[BD BOARD] (SIDE B)
90
91
120
1
IC933
IC195
1
3
23
1
27
CN103
CN102
NOTE:It is useful to use the jig. for checking the waveform. (Refer
to Servicing Note on page 6.)
4
1
IC803
8
5
24
13
25
12
IC101
36
1
37
48
IC701
4
5
3
1
61
CN105
60
IC201
31
30
1
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