Canon imageRUNNER C1335 Series, Руководство по обслуживанию

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Technical Explanation > Original Exposure and Feed System > Image Processing > Image Processing by the Main Controller PCB (Reader ASIC)
Technical Explanation > Original Exposure and Feed System > Image Processing > Image Processing by the Main Controller PCB (Reader ASIC)
Dust Detection Preventive Process
If dust is detected in paper of the last job, the reading position of the following stream reading
jobs is changed to avoid the dust.
Executed behavior:
The amounts of adjustment for avoiding dust are -0.5 mm, 0 mm, and +0.5 mm.
Each time dust is detected in the last sheets of paper of a stream reading job, the reading
position moves to the three positions in the order of 0 mm, -0.5 mm, +0.5 mm, and 0 mm.
At this time, if the following conditions are detected 6 times in a row, the Reading Glass is
judged to be dirty and a message prompting for cleaning of the Reading Glass is displayed
on the Control Panel.
Condition:
• Dust of 1 pixel or more and less than 5 pixels is detected in 11 locations
• Dust of 5 pixels or more is detected in 14 locations
Related Service Mode:
(Lv1) COPIER > OPTION > IMG-RDR > DFDST-L1
Adjustment of dust detection level when using DADF (between originals)
0.5mm 0.5mm
B A C
ADF Reading Glass
Lens
Contact Image Sensor Unit
Platen Guide
Position Description
A Reference position for read
B About 0.5 mm to the left of the reference position A
C About 0.5 mm to the right of the reference position A
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