Sony HCD-CP33 Service Manual page 30

11. Rotate the AMS dial until the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
Specification A = B
12. Press the ENTER/YES button, and save the adjustment results
in the non-volatile memory. ("EFB =
displayed for a moment.)
Next "EF MO ADJUST" is displayed. The disc stops rotating
automatically.
13. Press the MD Z button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Roteto AMS dial and display "EF CD ADJUST".
16. Press the ENTER/YES button and display "EFB =
Servo is imposed automatically.
17. Rotate the AMS dial so that the waveform of the oscilloscope
moves closer to the specified value.
In this adjustment, waveform varies at intervals of approx. 2%.
Adjust the waveform so that the specified value is satisfied as
much as possible.
(Traverse Waveform)
VC
Specification A = B
18. Press the ENTER/YES button, display "EFB =
a moment and save the adjustment results in the non-volatile
memory.
Next "EF CD ADJUST" will be displayed.
19. Press the MD Z button and remove the check disc (MD) TDYS-
1.
Note 1 : MO reading data will be erased during if a recorded disc is
used in this adjustment.
Note 2 : If the traverse waveform is not clear, connect the
oscilloscope as shown in the following figure so that it can
be seen more clearly.
BD board
CN110 pin 3 (TE)
CN110 pin 1 (VC)
30
SAVE" will be
A
B
SAVE" for
Oscilloscope
330 kΩ
10pF
6-12. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/AU-1).
2. Rotate the AMS dial and display "CPLAY MODE".
3. Press the ENTER YES button and display "CPLAY MID".
4. Press the MENU/NO button when "C1 =
displayed.
5. Rotate the AMS dial and display "FBIAS ADJUS".
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.
B
7. Rotate the AMS dial in the clockwise direction and find the
focus bias value at which the C1 error rate becomes about 200
(Refer to Note 2).
8. Press the ENTER/YES button and display "
9. Rotate the AMS dial in the counterclockwise direction and
find the focus bias value at which the C1 error rate becomes
about 200.
10. Press the ENTER/YES button and display "
11. Check that the C1 error rate is below 50 and ADER is 00. Then
press the ENTER/YES button.
12. If the "( )" in "
ENTER/YES button.
If below 20, press the MENU/NO button and repeat the
CD".
adjustment from step 2.
13. Press the MD Z button to remove the test 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 average vale.
C1 error
about
200
b
AD =
/
/
/
- - ( )" is above 20, press the
c a Focus bias value
(F. BIAS)
" is
a = ".
b = ".
c = ".