Sony MDS-PC1 Service Manual page 41

5-8. FOCUS BIAS ADJUSTMENT
Adjusting method:
1. Load a continuously recorded disc (Refer to "5-4. Creating the
Continuously Recorded Disc".)
2. Rotate the AMS knob to display "CPLAY MODE".
3. Press the YES button to display "CPLAY MID".
4. When "C1= AD=
5. Rotate the AMS knob to display "FBIAS ADJUST".
6. Press the YES button to display "
The first four digits indicate the C1 error rate, the two digits
after the "/" indicate ADER and the two digits after "a=" indicate
the focus bias value.
7. Rotate the AMS knob in the clockwise direction, and look for
the focus bias value at which the C1 error rate becomes
approximately 220 (Refer to Note 2).
8. Press the YES button to display "
9. Rotate the AMS knob in the counterclockwise direction, and
look for the focus bias value at which the C1 error rate becomes
220.
10. Press the YES button to display "
11. Check that the C1 error rate is below 50 and that ADER is 00,
and press the YES button.
12. If the value of "( )" in the "
above 20, press the YES button.
If below, press the NO button and start from step 2 again.
13. Press the § button and remove the continuously recorded disc.
Note 1: The following figure shows the relation between the C1
error and focus bias value. Look for points a and b in the
following figure by the adjustment above. The focus
position (point c) is automatically calculated from points a
and b.
Note 2: As the C1 error rate changes, use the average value in the
adjustment.
C1 error
220
b c
" is displayed, press the NO button.
/ a= ".
/ b= ".
/ b= ".
- - ( )" displayed is
Focus bias value
(F. BIAS)
a
5-9. ERROR RATE CHECK
5-9-1. CD ERROR RATE CHECK
Checking Procedure:
1. Load a check disc (MD) TDYS-1.
2. Rotate the AMS knob to display "CPLAY MODE".
3. Press the YES button to display "CPLAY MID".
4. "C1= AD=
5. Check that the C1 error rate is below 20.
6. Press the NO button to stop playback. Then press the § button
and remove the check disc (MD).
5-9-2. MO Error Rate Checking
Checking Procedure:
1. Load a continuously recorded disc (Refer to "5-4. Creating the
Continuously Recorded Disc".)
2. Rotate the AMS knob to display "CPLAY MODE".
3. Press the YES button to display "CPLAY MID".
4. "C1= AD=
5. Check that the C1 error rate is below 50 and ADER is 00.
6. Press the NO button to stop playback. Then press the § button
and remove the disc.
5-10. FOCUS BIAS CHECK
Change the focus bias value and check the focus tolerance amount.
Checking Procedure:
1. Load a continuously recorded disc (Refer to "5-4. Creating the
Continuously Recorded Disc".)
2. Rotate the AMS knob to display "CPLAY MODE".
3. Press the YES button to display "CPLAY MID".
4. When "C1=
5. Rotate the AMS knob to display "FBIAS CHECK",
6. Press the YES button to display "
The first four digits indicate the C1 error, the two digits after the
"/" indicate ADER and the two digits after "c=" indicate the
focus bias value.
Check that the C1 error is below 50 and ADER is 00.
7. Press the YES button to change the display to "
".
Check that the C1 error does not drop below 220 and ADER
does not remain above 00.
8. Press the YES button to change the display to "
".
Check that the C1 error does not drop below 220 and ADER
does not remain above 00.
9. Press the NO button, press the § button next, and remove the
continuously recorded disc.
Note 1:If the C1 error is above 220 or ADER is above 00 only for
point a (step 8 above) and point b (step 7 above), the focus
bias may not be adjusted properly. In this case, adjust again.
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" is displayed.
" is displayed.
AD= " is displayed, press the NO button.
/ c= ".
/ b=
/ a=