Dirt Sensor Control; Outline - Canon iR2422 series Service Manual

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) 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)
Before original size identification processes 1 and 2 are performed, the original size is detected with original sensors as follows:
Original
* For Chinese paper, the following sizes are detected:
8K:Equivalent to B4 size
16K:Equivalent to B5 size

4.3.5 Dirt Sensor Control

4.3.5.1 Outline

Original sensor 3/4
Original sensor 3/4
Change absent
Change present
AB-Configration
Original Original
Original
sensor 1 sensor 3
size sensor 2
A3
A4
B4(8K)*1
B5(16K)*1
A4R
B5R(16K)*1
No original
Original sensor 3
Original sensor 4
30
Original (A4R)
Original sensor 1
Original sensor 2
Original sensor 1/2
F-4-19
Original sensor 3
Original sensor 4
Original (A4R)
5
Original sensor 1
Original sensor 2
Original sensor 1/2
F-4-20
Original sensor 3
Original sensor 4
Original (A4R)
Original sensor 1
Original sensor 2
F-4-21
Inch-Configration
Original
Original
sensor 4 size
11"X17"
LTR
LGL
LTR-R
No original
F-4-22
Original Original Original
sensor 1 sensor 3 sensor 5
:No original
:Change absent
Chapter 4
0020-4239
4-15