Sony HCD-CL5MD Service Manual page 42

HCD-CL5MD
11. Move ./> 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 =
played for a moment.)
Next "EF MO ADJUS" (C07) is displayed. The disc stops ro-
tating automatically.
13. Press the Z button and remove the disc.
14. Load the check disc (MD) TDYS-1.
15. Move ./> and display "EF CD ADJUS" (C08).
16. Press the ENTER/YES button and display "EFB =
Servo is imposed automatically.
17. Move ./> 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 ADJUS" (C08) will be displayed.
19. Press the 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 oscillo-
scope as shown in the following figure so that it can be
seen more clearly.
BD (MD) board
CN105 pin 4 (TE)
CN105 pin 6 (VC)
42
SAVE" will be dis-
A
B
SAVE" for
Oscilloscope
330 kΩ
10pF
6-13. FOCUS BIAS ADJUSTMENT
Adjusting Procedure :
1. Load a test disk (MDW-74/GA-1).
2. Move ./> and display "CPLAY1MODE"(C34).
3. Press the ENTER/YES button and display "CPLAY1MID".
4. Press the MENU/NO button when "C1 =
displayed.
5. Move ./> and display "FBIAS ADJUS"(C09).
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. Move ./> in the right direction and find the focus bias
value at which the C1 error rate becomes 220 (Refer to Note 2).
8. Press the ENTER/YES button and display "
9. Move ./> in the left direction and find the focus bias
value at which the C1 error rate becomes 220.
10. Press the ENTER/YES button and display "
11. Check that the C1 error rate is below 20 and ADER is 00. Then
press the ENTER/YES button.
12. If the "( " in "
YES button.
If below 20, press the MENU/NO button and repeat the ad-
justment from step 2.
13. Press the Z button and remove the test disc.
CD".
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 us-
ing the average vale.
C1 error
220
b
- - ( " is above 20, press the ENTER/
c a Focus bias value
(F. BIAS)
AD = " is
/ a = ".
/ b = ".
/ c = ".