Outline; Points Of Detection - Canon ImageRunner iR8500 Series Service Manual

- When the ADF Is Opened
When the ADF is opened, the ADF-side sensor goes ON as soon as it is opened 5 deg or higher [1], causing the machine to assume that the ADF has been
opened and that the original has been removed; as a result, the size of the original that has been detected automatically will be cleared. Thereafter, when
the ADF is opened farther and to 30 deg or higher [2], the machine-side sensor goes ON, enabling automatic detection of original size.
- When the ADF Is Closed
When the ADF is closed, the machine-side sensor goes ON as soon as it is closed to 30 deg or lower [3], causing the machine to assume that the ADF is
starting to close; 4 sec thereafter, the machine assumes that the ADF is fully closed [4].

5.3.4.3 Outline

/ iR8070
The machine automatically identifies the size of originals based on the combination of intensities measured by reflection type sensors and CCD at specific
points.
- For main scanning direction, the CCD is used to take measurements (if AB, 4 points; if Inch, 2 points).
- For sub scanning direction, a reflection type photosensor is used (1 point).

5.3.4.4 Points of Detection

/ iR8070
For main scanning direction, the No. 1 mirror base is moved to the following points in re-lation to the position of the original to measure the intensity at
each point.
For sub scanning direction, on the other hand, measurements are taken while holding the sensor in place at a specific point.
Machine-side
open/closed
detection sensor
ADF-side open/closed
detection sensor
5
[1]
0
F-5-31
90
F-5-32
90
30
[3]
0
F-5-33
30
[2]
5
0
[4]
Chapter 5
0008-7409
0008-7412
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