Outline Of Original Size Detection - Canon iR2020 Series Service Manual

4.3.4.2 Outline of Original Size Detection

iR2016J / iR2016 / iR2020 / / iR2016i / iR2020i
- In the BOOK mode
Å@One sheet of original (A4R) is set and the copyboard cover (or ADF ) is closed.
1) Standby state
Å@Original sensor: Turns off.
2) The copyboard cover opens (at an angle of more than 30o).
Å@Original sensor: Turns off.
3) The copyboard cover is closed (at an angle of 30 deg).
Å@Original sensor: Turns on and original size identification process 1 is performed.
4) The copyboard cover is closed (at an angle of more than 5 deg but less than 30 deg)
Å@Original sensor: Turns on and original size identification process 2 is performed.
5) The original cover is closed (at an angle of 5 deg or less)Å@
Å@Å@The original size is identified.
Å@Å@Original sensor: Turns off.
In identifying the original size, the data obtained in the original size identification process 1 is compared with the data obtained in the original size identification
process 2 to check whether these two pieces of data are identical.
Note that a wrong original size may be identified because the sensor output level does not change in the following cases:
- When the original is A3-sized black
- When the original is a book (its thickness does not allow the copyboard cover to close fully, making it difficult to detect the sensor level change).
- When the copyboard cover is not closed fully (the sensor level change is not detected after lapse of the above time-out time)
Before original size identification processes 1 and 2 are performed, the original size is detected with original sensors as follows:
Original sensor 3
Copyboard cover
Reader unit
Original sensor 1
Original sensor 2
F-4-16
Original sensor 1
Original sensor 2
F-4-17
30
Original (A4R)
Original sensor 1
Original sensor 2
Original sensor 3/4
Original sensor 1/2
F-4-18
Original (A4R)
5
Original sensor 1
Original sensor 2
Original sensor 3/4 Original sensor 1/2
F-4-19
Original (A4R)
Original sensor 1
Original sensor 2
Change absent
Change present
F-4-20
Original sensor 4
Copyboard glass
Original sensor 3
Original sensor 4
Original sensor 3
Original sensor 4
Original sensor 3
Original sensor 4
Original sensor 3
Original sensor 4
Chapter 4
0010-4256
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