Ricoh C211 Service Manual page 555

1-4. Adjusting The Focus (MTF Adjustment)
\
8 lines/mm
.."
4
*~x100248°10
----- SS950
; x 100240 $%0 ----- SS830
* Amplitude "B" (difference between white and black levels) must be a
minimum.
Purpose :
To focus the lens (focal distance between the CCD and the lens)
Method : 1.
2.
3.
4.
5.
Position the test chart so that the 8-lines/mm section on the test chart can
be read.
Press the Print Start key (Start key: SS830) to turn on the fluorescent lamp.
Confirm that the wave form is similar to the above illustration:
If incorrect, loosen the allen screw [A] and adjust the lens position
moving it as shown by the arrow.
After adjustment, retighten the allen screw [A].
[B] by
5-16