Read Sony DHC-EX880MD / DHC-MD717 / MDS-EX880 / MDS-MS717 Service Manual online
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8.
FOCUS BIAS ADJUSTMENT
Adjusting Method:
1. Load a continuously recorded disc (Refer to “4. Creating MO
1. Load a continuously recorded disc (Refer to “4. Creating MO
Continuously Recorded Disc”) to slot 1.
2. Turn the
[
=
SELECTOR
+
]
dial and display “CPLAY
MODE”.
3. Press the
[ENTER/YES]
button and display “CPLAY MID”.
4. Press the
[MENU/NO]
button when “C =
AD =
)” is
displayed.
5. Turn the
[
=
SELECTOR
+
]
dial and display “FBIAS
ADJUST”.
6. Press the
[ENTER/YES]
button and display “
/
a =
”.
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.
after [/] indicate ADER, and the 2 digits after [a=] indicate the
focus bias value.
7. Turn right the
[
=
SELECTOR
+
]
dial and find the focus
bias value at which the C1 error rate becomes 220. (Refer to
note 2.)
note 2.)
8. Press the
[ENTER/YES]
button and display “
/
b =
”.
9. Turn left the
[
=
SELECTOR
+
]
dial and find the fo-
cus bias value at which the C1 error rate becomes 220. (Refer
to note 2.)
to note 2.)
10. Press the
[ENTER/YES]
button and display “
/
c =
”.
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the
[ENTER/YES]
button.
12. If the “(
)” in “
-
-
(
)” is above 20, press the
[ENTER/YES]
button.
If below 20, press the
[MENU/NO]
button and repeat the ad-
justment from step 2 again.
13. Press the
[REPEAT]
button and press the
§ 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 auto-
matically calculated from points a and b.
the following figure. Find points a and b in the following figure
using the above adjustment. The focal point position c is auto-
matically calculated from points a and b.
Note 2:
As the C1 error rate changes, perform the adjustment using the
average vale.
average vale.
9.
ERROR RATE CHECK
9-1. CD Error Rate Check
Checking Method:
1. Load a test disc TDYS-1 to slot 1.
2. Turn the
1. Load a test disc TDYS-1 to slot 1.
2. Turn the
[
=
SELECTOR
+
]
dial and display “CPLAY
MODE”.
3. Press the
[ENTER/YES]
button and display “CPLAY MID”.
4. “C =
AD =
)” is displayed.
5. Check that the C1 error is below 20.
6. Press the
6. Press the
[MENU/NO]
button, stop playback, press the
[REPEAT]
button, and remove the test disc.
9-2. MO Error Rate Check
Checking Method:
1. Load a continuously recorded disc (Refer to “4. Creating MO
1. Load a continuously recorded disc (Refer to “4. Creating MO
Continuously Recorded Disc”) to slot 1.
2. Turn the
[
=
SELECTOR
+
]
dial and display “CPLAY
MODE”.
3. Press the
[ENTER/YES]
button and display “CPLAY MID”.
4. “C =
AD =
)” is displayed.
5. If the C1 error is below 50, check that ADER is 00.
6. Press the
6. Press the
[MENU/NO]
button, stop playback, press the
§
button, and remove the continuously recorded disc.
(To exit from the TEST mode, press the
(To exit from the TEST mode, press the
[REPEAT]
button.)
10. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Method:
1. Load a continuously recorded disc (Refer to “4. Creating MO
Checking Method:
1. Load a continuously recorded disc (Refer to “4. Creating MO
Continuously Recorded Disc”.).
2. Turn the
[
=
SELECTOR
+
]
dial and display “CPLAY
MODE”.
3. Press the
[ENTER/YES]
button and display “CPLAY MID”.
4. Press the
[MENU/NO]
button when “C =
AD =
)” is
displayed.
5. Turn the
[
=
SELECTOR
+
]
dial and display “FBIAS
CHECK”.
6. Press the
[ENTER/YES]
button and display “
/
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 02.
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 02.
7. Press the
[ENTER/YES]
button and display “
/
b =
”.
Check that the C1 error is not below 220 and ADER is not
above 02 every time.
above 02 every time.
8. Press the
[ENTER/YES]
button and display “
/
a =
”.
Check that the C1 error is not below 220 and ADER is not
above 02 every time.
above 02 every time.
9. Press the
[MENU/NO]
button, next press the
§ button, and
remove the continuously recorded disc.
Note 1:
If the C1 error and ADER are above 02 at points a or b, the focus
bias adjustment may not have been carried out properly. Adjust
perform the beginning again.
bias adjustment may not have been carried out properly. Adjust
perform the beginning again.
C1 error
220
b
c
a
Focus bias value
(F. BIAS)
(F. BIAS)
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