Ricoh C211 Service Manual page 129

3.1.6 Focus Adjustment (MTF Adjustment)
8 Iines)mm
8
B
t
+
.B
~ X 100248%
Amplitude "B" (difference between white and black levels) must be a
maximum
Purpose: To focus the lens (focus distance between the CCD and the lens).
1, Position the test chati so that the 8 lines/mm section on the test chart can be
read.
2. Press the Print Start key to turn on the fluorescent lamp.
3, Confirm that the wave form is similar to the above illustration.
4. If incorrect, loosen the allen screw [A] and adjust the lens position [B] by
moving it as shown by the arrow,
5. After adjustment, retighten the allen screw,
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