Canon imageRUNNER 2530 Service Manual page 39

2
Technology > Original Exposure System > Controls > Detecting the Size of Originals
Outline of Original Size Detection
- In the BOOK mode
One sheet of original (A4R) is set and the copyboard cover (or ADF ) is closed.
1) Standby state
Original sensor: Turns off.
Copyboard cover
Reader unit
2) The copyboard cover opens (at an angle of more than 30 deg).
Original sensor: Turns off.
3) The copyboard cover is closed (at an angle of 30 deg).
Original sensor: Turns on and original size identification process 1 is performed.
30°
Original sensor 2A/3 Original sensor 0/1
2 Technology > Original Exposure System > Controls > Detecting the Size of Originals
Original sensor 3
Original sensor 2A
Copyboard glass
Original sensor 0
Original sensor 1
F-2-18 F-2-18
Original sensor 3
Original sensor 2A
Original sensor 0
Original sensor 1
F-2-19 F-2-19
Original sensor 3
Original sensor 2A
Original (A4R)
Original sensor 0
Original sensor 1
F-2-20 F-2-20
4) The copyboard cover is closed (at an angle of more than 5 deg but less than 30 deg)
Original sensor: Turns on and original size identification process 2 is performed.
5°
Original sensor 2A/3 Original sensor 0/1
5) The original cover is closed (at an angle of 5 deg or less)
The original size is identified.
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)
Change absent
Change present
Original sensor 3
Original sensor 2A
Original (A4R)
Original sensor 0
Original sensor 1
F-2-21 F-2-21
Original sensor 3
Original sensor 2A
Original (A4R)
Original sensor 0
Original sensor 1
F-2-22 F-2-22
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