Canon iR3245 Series Service Manual page 172

Chapter 5
- At the start of a job (dust bypass)
Presence of dust is detected at points A, B, and C in this order in the same manner as at the end of the job. Read will take place at the point where least dust is
detected.
- Between sheets
The machine does not move CCD.
It reads the original using the position determined at the end or start of a job; however, if the presence of dust is still detected at the position, the machine will
execute image correction.
<Service Mode>
COPIER>OPTION>BODY>DFDST-L1 (level 1)
(used to adjust the dust detection level between sheets)
COPIER>OPTION>BODY>DFDST-L2 (level 1)
(used to adjust the dust detection level at the end of a job)
5-16
A
Point Description
A Read reference position
B About 0.5mm from the reference position to the inner side of the roller
C About 1.0mm from the reference position to the inner side of the roller
0.5mm 0.5mm
A B C
Stream
reading glass
LED
Lens
B C
F-5-23
Platen roller
CCD
F-5-24