Canon imageRUNNER 2530 Service Manual page 41

2
Technology > Original Exposure System > Controls > Dirt Sensor Control
[Description of Control]
- At job end (Dust detection)
The contact image sensor (CIS) checks the light reflected by the ADF platen roller surface
at the read position for presence/absence of dust.
After completion of a job,dust detection is performed in the positions A, B and C without
concern of presence/absence of dust.
1) Dust detection is performed once at position A.
2) CIS moves to the position B and dust detection is performed once.
3) CIS moves to the position C and dust detection is performed once.
4-a) CIS moves to the position where there is no dust, with priority for the detecting
position; A>B>C.
4-b) If dust is detected at all points A, B, and C, move back to position A and the original is
scanned at position A.
A
2 Technology > Original Exposure System > Controls > Dirt Sensor Control
B C
F-2-25 F-2-25
- Immediately before scanning (one sheet at a time)
The contact image sensor (CIS) does not move to detect dust.
The original is read at the position determined at job end or start. If presence of dust is
detected there, the read image is corrected.
Point
A Read reference position
B About 0.5 mm from the reference position to the inside of the roller
C About 1.0 mm from the reference position to the inside of the roller
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Description
T-2-5 T-2-5
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