Focus Bias Adjustment; Error Rate Check; Focus Bias Check; Cd Error Rate Check - Sony HCD-MD313 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. Turn the VOLUME knob and display "CPLAY MODE".
3. Press the p (CD) button and display "CPLAY MID".
4. Press the POWER button when "C1=
played.
5. Turn the VOLUME knob and display "FBIAS ADJUST".
6. Press the p (CD) 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. Turn the VOLUME knob in the clockwise direction and find
the focus bias value at which the C1 error rate becomes 220.
(Refer to note 2.)
8. Press the p (CD) button and display "
9. Turn the VOLUME knob in the counterclockwise derection and
find the focus bias value at which the C1 error rate becomes
220. (Refer to note 2.)
10. Press the p (CD) button and display "
11. Check that the C1 error rate is below 50 and ADER is 00.
Then press the p (CD) button.
12. If the "( )" in " - -
p (CD)button.
If below 20, press the ^ (CD) button and repeat the adjust-
ment from step 2 again.
13. Press the POWER button and press the § (MD) button to re-
move 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 using the av-
erage vale.
C1 error
220
b c
AD= " is dis-
/ a= ".
/ b= ".
/ c= ".
( )" is above 20, press the
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. Turn the VOLUME knob and display "CPLAY MODE".
3. Press the p (CD) button and display "CPLAY MID".
4. "C1= AD=
5. Check that the C1 error is below 20.
6. Press the ^ (CD) button, stop playback, press the
§ (MD) EJECT 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. Turn the VOLUME knob and display "CPLAY MODE".
3. Press the p (CD) button and display "CPLAY MID".
4. "C1= AD=
5. If the C1 error is below 50, check that ADER is 00.
6. Press the ^ (CD) button, stop playback, press the
§ (MD) 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. Turn the VOLUME knob and display "CPLAY MODE".
3. Press the p (CD) button and display "CPLAY MID".
4. Press the POWER button when "C1=
played.
5. Turn the VOLUME knob and display "FBIAS CHECK".
6. Press the p (CD) 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 p (CD) button and display "
Check that the C1 error is not below 220 and ADER is not above
00 every time.
8. Press the p (CD) button and display "
Check that the C1 error is not below 220 and ADER is not above
00 every time.
9. Press the POWER button, next press the § (MD) 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.
– 22 –
" is displayed.
" is displayed.
AD=
/ c=
/ b= ".
/ a=
" is dis-
".
".