Detecting The Size Of Originals; Outline - Canon iR4570 Series Service Manual

Chapter 5

5.3.4 Detecting the Size of Originals

5.3.4.1 Outline

iR2270 / iR2870 / iR3570 / iR4570
The machine identifies the size of the original with reference to the presence/absence of output levels of the reflecting
type sensors; specifically,
-the machine identifies the absence of paper if it finds a change in the output of the reflection type sensors when the
copyboard cover is closed/opened.
-the machine identifies the presence of paper if it does not find a change in the output of the reflection type sensors
when the copyboard cover is closed/opened.
The machine uses the following sensors; and the sensors are arranged as shown in the following figure:
-for main scanning direction, reflection type photosensors (AB-configuration, 2 locations; Inch-configuration, 1
location).
-for sub scanning direction, reflection type photosensors (AB-configuration, 2 locations; Inch-configuration, 2
locations)
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