Ricoh C211 Service Manual page 130

3.1.7 Reduction Ratio Adjustment (Moire Adjustment)
Purpose: To adjust the focus (to set distance between the lens and the original)
1. Position the test chart so that the area containing 8 lines/mm on the test
chart can be read (See page 5-17),
2. Press the Print Start key to turn on the fluorescent lamp.
3. At the same time, confirm that the waveform is similar to the above
illustration,
4, If incorrect, loosen the mounting screws [A] and adjust the lens block [B]
position as indicated by the arrows,
5. After adjustment, retighten the mounting screw [A].
5-18