7. Scanner section (IR section)
Theory of Operation Ver. 8.0 Jun. 2008
2
4
Composition/Operation
(2) DF original glass cleaning movement performed each time after reading a sheet
of original
• While reading multiple originals consecutively, the DF original glass moves widely back
and forth between each original reading.
• Due to the effect of the step sheet that makes contact with the DF original glass, stain on
the DF original glass can be removed from the reading position and reduce image
streaks in the sub scan direction.
• Stain collected on the DF original glass is removed from the reading section by the trail-
ing edge of an original that is passing by.
(3) DF original glass cleaning movement performed after completing a job
• After the completion of a job, the DF original glass moves widely back and forth to
remove stain remaining on the surface. This reduces the occurrence of lines in the sub
scan direction.
(4) Split line erase movement
• While reading originals, the DF original glass moves widely. This is to remove stain on
the glass and to enable the image processing board to detect lines produced by stain.
The detected lines are corrected in the image-processing step to prevent the occurrence
of lines. After the completion of image reading, the DF original glass returns to the origi-
nal position.
• This movement can be done when level 2 or higher is selected from 0 to 6 levels in the
Detection during paper passage setting. To make this setting, press keys as follows. Ser-
vice Mode
o
[System 2]
o
[Split Line Detect. Setting]
DF original glass
Image reading position
Step sheet
A00JT2C544DA
Stain
DF original glass
Original
Image reading position
Theory of Operation Y107522-3
