Focus Bias Adjustment; Error Rate Check; Focus Bias Check - Sony HMD-M11 Service Manual

5-8. FOCUS BIAS ADJUSTMENT

Adjusting Method:
1. Load a continuously recorded disc (Refer to "5-4. Creating
MO Continuously Recorded Disc".).
2. Press the = 0 button or ) + button and display
"CPLAY MODE".
3. Press the YES button and display "CPLAY MID".
4. Press the NO button when "C1=
5. Press the = 0 button or ) + button and display
"FBIAS ADJUST".
6. Press the YES button and display "
The first four digits indicate the C1 error rate, the two digits
after [/] indicate ADER, and the 2 digits after [a=] indicate the
focus bias value.
7. Press the ) + button and find the focus bias value at
which the C1 error rate becomes 220. (Refer to note 2.)
8. Press the YES button and display "
9. Press the = 0 button and find the focus bias value at
which the C1 error rate becomes 220. (Refer to note 2.)
10. Press the YES button and display "
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the YES button.
12. If the "( )" in " - -
button.
If below 20, press the NO button and repeat the adjustment
from step 2 again.
13. Press the NO button and press the 6 button to remove the
continuously recorded disc.
Note 1: The relation between the C1 error and focus bias is as
shown in the following figure. Find points a and b in the
following figure using the above adjustment. The focal
point position c is automatically calculated from points a
and b.
Note 2: As the C1 error rate changes, perform the adjustment us-
ing the average vale.
C1 error
220
b c
AD= " is displayed.
/ a= ".
/ b= ".
/ c= ".
( )" is above 20, press the YES
Focus bias value
(F. BIAS)
a

5-9. ERROR RATE CHECK

5-9-1. CD Error Rate Check
Checking Method:
1. Load a test disc TDYS-1.
2. Press the = 0 button or ) + button and display
"CPLAY MODE".
3. Press the YES button and display "CPLAY MID".
4. "C1= AD=
5. Check that the C1 error is below 20.
6. Press the NO button, stop playback, press the 6 button, and
remove the test disc.
5-9-2. MO Error Rate Check
Checking Method:
1. Load a continuously recorded disc (Refer to "5-4. Creating
MO Continuously Recorded Disc".).
2. Press the = 0 button or ) + button and display
"CPLAY MODE".
3. Press the YES button and display "CPLAY MID".
4. "C1= AD= " is displayed.
5. If the C1 error is below 50, check that ADER is 00.
6. Press the NO button, stop playback, press the 6 button, and
remove the continuously recorded disc.

5-10. FOCUS BIAS CHECK

Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to "5-4. Creating
MO Continuously Recorded Disc".).
2. Press the = 0 button or ) + button and display
"CPLAY MODE".
3. Press the YES button and display "CPLAY MID".
4. Press the NO button when "C1=
5. Press the = 0 button or ) + button and display
"FBIAS CHECK".
6. Press the YES button and display "
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 00.
7. Press the YES button and display "
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
8. Press the YES button and display "
Check that the C1 error is not below 220 and ADER is not
above 00 every time.
9. Press the NO button, next press the 6 button, and remove
the continuously recorded disc.
Note 1: If the C1 error and ADER are above 00 at points a or b,
the focus bias adjustment may not have been carried out
properly. Adjust perform the beginning again.
– 36 –
" is displayed.
AD= " is displayed.
/ c= ".
/ b= ".
/ a= ".