Canon iR7086 Series Service Manual page 199

Note:
Change in the Signal in Response to ADF Open -> Closed
change present: no
other: yes
The OR argument is applied to the outputs at 2 points.
2. Priority on the Presence of an Original at the Front
If the machine detects the absence of an original at the rear in spite of detection of the presence at the front for main scanning direction, the machine will identify
the size of the original upholding the result of detection at the front.
EX (B5 original)
Original size
border line
Near 13-mm point
Original size
border line
Result of movement
A B
no no
yes no
no yes
yes yes
(rear)
Point of detection 1
Point of detection 2
Point of detection 3
Point of detection 4
(front)
CCD original detection position
Point of detection
1
2
1A = additional
detection point 1
Near 4-mm point
1B = additional
detection point 2
F-5-24
T-5-5
Result of identification
original absent
original present
original present
original present
Document size
sensor 1
B5
F-5-25
T-5-6
Result of Result of identification
detection
present/absent
present present
absent present
Chapter 5
5-13