Canon iR4570 Series Service Manual page 226

Chapter 5
2. The copyboard cover is opened (with cover angle at 25 deg or more).
original sensor: off
Original sensor 1
Original sensor 2
F-5-17
3. The copyboard cover is closed (with cover angle at 25 deg).
original sensor: on (original size identification processing 1)
25
Original sensor 1
Original sensor 2
Original sensor 3/4 Original sensor 1/2
F-5-18
4. Copyboard cover is closed (with cover angle at 5 deg or more but less than 25 deg).
Original sensor: on (original size identification 2)
5
Original sensor 1
Original sensor 2
Original sensor 3/4 Original sensor 1/2
F-5-19
5. The copyboard cover is closed (5 deg or less).
size identified
original sensor: off
In identifying the size of an original, the data from original size identification processing 1 and data from original
size identification processing 2 are compared, and the difference between these 2 sets of data is checked.
If any of the following is true, the output of the sensors may not show any change, preventing the machine from
correctly identifying the size:
-the original is an A3 black original
-the original is a book (its thickness may not allow the copyboard cover to close fully, thus preventing the detection
of a change in the sensor level).
-the copyboard cover is not closed fully (when a time-out condition occurs, there will be no detection of a change in
5-18
Original sensor 3
Original sensor 4
Original sensor 3
Original sensor 4
Original (A4R)
Original sensor 3
Original sensor 4
Original (A4R)