Sony PMC-MD55 Service Manual page 135

[YES, ENTER]
17. Press the
for a moment and save the adjustment results in the non-vola-
tile memory.
Next "EFBAL ADJUST" will be displayed.
[MD EJECT
18. Press the Z
10. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load the continuously-recorded disc. (Refer to "5. CREAT-
ING CONTINUOUSLY-RECORDED DISC")
2. Turn the JOG dial to display "CPLAY MODE".
[YES, ENTER]
3. Press the
[NO, CANCEL]
4. Press the
is displayed.
5. Turn the JOG dial to display "FBIAS ADJUST".
[YES, ENTER]
6. Press the
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. Turn the JOG dial clockwise and find the focus bias value at
which the C1 error rate becomes about 200 (Refer to Note 2).
[YES, ENTER]
8. Press the
9. Turn the JOG dial counterclockwise and find the focus bias
value at which the C1 error rate becomes about 200.
[YES, ENTER]
10. Press the
11. Check that the C1 error rate is below 50 and ADER is 00.
[YES, ENTER]
Then press the
12. If the "( )" in " -
[YES, ENTER]
button.
[NO, CANCEL]
If below 20, press the
adjustment from step 2.
[MD EJECT
13. Press the
Z
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.
Note 2: As the C1 error rate changes, perform the adjustment using the
average vale.
C1 error
about
200
B
C
button, display "EFB = SAVE"
]
button and take out the disc.
button to display "CPLAY MID".
button when "C1 = AD =
button to display " / a =
button to display " / b =
button to display " / c =
button.
- ( )" is above 20, press the
button and repeat the
]
button and take out the disc.
A Focus bias value
(F. BIAS)
11. ERROR RATE CHECK
11-1. CD Error Rate Check
Checking Procedure :
1. Load the check disc (MD) TDYS-1.
2. Turn the JOG dial and display "CPLAY MODE".
[YES, ENTER]
3. Press the
MID".
4. The display changes to "C1 =
5. Check that the C1 error rate is below 20.
[NO, CANCEL]
6. Press the
[MD EJECT
the
11-2. MO Error Rate Check
" Checking Procedure :
1. Load the continuously-recorded disc. (Refer to "5. CREAT-
ING CONTINUOUSLY-RECORDED DISC")
". 2. Turn the JOG dial to display "CPLAY MODE".
[YES, ENTER]
3. Press the
4. The display changes to "C1 =
5. If the C1 error rate is below 50, check that ADER is 00.
[NO, CANCEL]
6. Press the
[MD EJECT
the
".
12. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
".
Checking Procedure :
1. Load the continuously-recorded disc. (Refer to "5. CREAT-
ING CONTINUOUSLY-RECORDED DISC")
2. Turn the JOG dial to display "CPLAY MODE".
[YES, ENTER]
3. Press the
[NO, CANCEL]
4. Press the
is displayed.
5. Turn the JOG dial to display "FBIAS CHECK".
[YES, ENTER]
6. Press the
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.
[YES, ENTER]
7. Press the
Check that the C1 error is about 200 and ADER is below 2.
[YES, ENTER]
8. Press the
Check that the C1 error is about 200 and ADER is below 2
[NO, CANCEL]
9. Press the
button and take out the disc.
Note 1: If the C1 error and ADER are above other than the specified
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 prop-
erly. Adjust perform the beginning again.
– 26 –
button twice and display "CPLAY
AD = ".
button to stop playback, then press
]
Z button and take out the check disc.
button to display "CPLAY MID".
AD = ".
button to stop playback, then press
]
button and take out the test disc.
Z
button twice to display "CPLAY MID".
button when "C1 =
button to display "
button and display "
button and display "
[MD EJECT ]
button, then press the
AD = "
/ c = ".
/ b = ".
/ a = ".
Z