Service manual

36
18. Press the ENTER/YES “R” button, display “EFB = SAVE”
for a moment and save the adjustment results in the non-volatile
memory.
Next “EF CD ADJUST” will be displayed.
19. Press the A (MD) button and take out the disc.
5-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load the continuously-recorded disc. (Refer to “5-5. CRE-
ATING CONTINUOUSLY-RECORDED DISC”)
2. Press the l m or M L button to display “CPLAY
MODE”.
3. Press the ENTER/YES “R” button to display “CPLAY MID”.
4. Press the MENU/NO “R” button when “C1 = AD = ” is
displayed.
5. Press the l m or M L button to display “FBIAS
ADJUST”.
6. Press the ENTER/YES “R” button to 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.
7. Press the M L button and find the focus bias value at
which the C1 error rate becomes about 200 (Refer to Note 2).
8. Press the ENTER/YES “R” button to display “ / b = ”.
9. Press the l m button and find the focus bias value at
which the C1 error rate becomes about 200.
10. Press the ENTER/YES “R” button to display “ / c = ”.
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the ENTER/YES “R” button.
12. If the “( )” in “ - - ( )” is above 20, press
the ENTER/YES “R” button.
If below 20, press the
MENU/NO “R” button and repeat the ad-
justment from step 2.
13. Press the A (MD) button and take out the 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.
Note 2: As the C1 error rate changes, perform the adjustment using the
average vale.
5-13. ERROR RATE CHECK
5-13-1. CD Error Rate Check
Checking Procedure :
1. Load the check disc (MD) TDYS-1.
2. Press the l m or M L button and display “CPLAY
MODE”.
3. Press the ENTER/YES “R” button twice and display “CPLAY
MID”.
4. The display changes to “C1 = AD = ”.
5. Check that the C1 error rate is below 20.
6. Press the MENU/NO “R” button to stop playback, then press
the A (MD) button and take out the check disc.
C1 error
about
200
B
C A Focus bias value
(F. BIAS)
5-13-2. MO Error Rate Check
Checking Procedure :
1. Load the continuously-recorded disc. (Refer to “5-5. CRE-
ATING CONTINUOUSLY-RECORDED DISC”)
2. Press the l m or M L button to display “CPLAY
MODE”.
3. Press the ENTER/YES “R” button to display “CPLAY MID”.
4. The display changes to “C1 = AD = ”.
5. If the C1 error rate is below 50, check that ADER is below 2.
6. Press the MENU/NO “R” button to stop playback, then press
the A (MD) button and take out the test disc.
5-14. FOCUS BIAS CHECK
Change the focus bias and check the focus tolerance amount.
Checking Procedure :
1. Load the continuously-recorded disc. (Refer to “5-5. CRE-
ATING CONTINUOUSLY-RECORDED DISC”)
2. Press the l m or M L button to display “CPLAY
MODE”.
3. Press the ENTER/YES “R” button twice to display “CPLAY
MID”.
4. Press the MENU/NO “R” button when “C1 = AD = ” is
displayed.
5. Press the l m or M L button to display “FBIAS
CHECK”.
6. Press the ENTER/YES “R” button to 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 below 2.
7. Press the ENTER/YES “R” button and display “ / b =
”.
Check that the C1 error is about 200 and ADER is below 2.
8. Press the ENTER/YES “R” button and display “ / a =
”.
Check that the C1 error is about 200 and ADER is below 2.
9. Press the MENU/NO “R” button, then press the A (MD) 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.
5-15. AUTO GAIN CONTROL OUTPUT LEVEL
ADJUSTMENT
Be sure to perform this adjustment when the optical pick-up is
replaced.
If the adjustment results becomes “Adjust NG!”, the optical pick-
up may be faulty or the servo system circuits may be abnormal.
5-15-1. CD Auto Gain Control Output Level Adjustment
Adjusting Procedure :
1. Load the check disc (MD) TDYS-1.
2. Press the l m or M L button to display “AG Set
(CD)”.
3. When the ENTER/YES “R” 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)”.
4. Press the A (MD) button and take out the check disc.