Canon imageRUNNER 2270 Service Manual page 185

Chapter 5
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
O riginal 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 the sensor level).
Change absent
Change present
F-5-20
The machine uses the following in reference to changes occurring in the sensor output as
found in original size identification processing 1 and original size identification processing
5-20
Original sensor 3
Original sensor 4
Original (A4R)
Original sensor 1
Original sensor 2
Original sensor 3
Original sensor 4
Original (A4R)
Original sensor 1
Original sensor 2