15 February 2006 IMAGE PROCESSING
6-43
Detailed
Descriptions
Removing Vertical White Lines During Duplex Scanning
During duplex scanning, the CCD
scans the front side and the CIS
scans the rear side. In Text, Pale,
or Generation Copy mode, when
there are halftones (such as
photos) on the rear side, vertical
white lines may appear in these
areas. This is because of gaps at
the junctions between blocks of
elements in the CIS (there is a
junction every 25 mm). If this
occurs, adjust SP4902 010~014
(Image Adjust Mode – Back Side
Scan). Increasing the value
reduces the white stripes, but could
reduce resolution slightly.
Otherwise, try using Text/Photo
mode.
NOTE: Each original mode has a
separate adjustment.
Duplex Scan Mode
Image Quality of Front/Back
Sides Differnt?
Duplex Scan Mode
Back Side Has White Stripes
in Halftones?
END
Simplex Scan Mode
Front Side And Duplex Scan
Front Side Image Quality
Different?
White Stripes on Back Side Gone
After Adjusting SP4902 010~014?
Equal Image Quality Restored After
Adjusting With SP4901 010~014
Equal Quality Restored After
Adjusting with SP4901 019?
*1
*2
*3
B246D818.WMFF
*1: Front Side Quality Adjustment
*2: Rear Side Quality Adjustment
*3: Simplex/Duplex Front Side Quality Adjustment
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