Ricoh C226 Service Manual page 66

OPTICS/IMAGE PROCESSING
Image Position Adjustment in the Main Scan Direction
To adjust the image position of the original across the printout, the image can
be shifted ± 1.9 mm in the main scan direction using SP mode No. 31 (platen
mode) or No. 37 (ADF mode).
The image shift in the main scan direction is done by changing the
relationship between the original scanning start timing and the master making
start timing. Data for one main scan line are stored in a line memory. When
the data is output from memory, the output timing is changed to shift the
image.
Paste Shadow Erase Mode
Due to the characteristics of the contact image sensor, shadows of a
paste-up original tend to appear on copies. To counter this, the paste shadow
erase mode can be used by pressing a key on the operation panel.
When this mode is selected, the black or white threshold level is slightly
lowered. At the same time, the emphasis in the sub-scan direction in the MTF
correction process is weakened to make the shadows inconspicuous.
SM 2-17 C226