CHAPTER 5 PICK-UP/FEEDING SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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II. JAM DETECTION
The copier has two sensors to sense whether copy paper is being fed normally.
• Pre-registration paper sensor (Q2)
• Delivery paper sensor (Q8)
A paper jam is identified by the microprocessor by reading signals from the sensors at prede-
termined times. In relation to the presence/absence of paper at a sensor at that time, it identifies if
paper is moving through the copier correctly.
If a jam occurs, the copier memorizes the number of copies that are still to be made and also
the copier settings. This information is stored in the copier, even if the power is cut off by opening
the front door as when resetting the copier.
The microprocessor identifies a jam in any of the following four cases. Also, the microproces-
sor judges that there is a jam if one of the sensors detects paper when the power is switched ON.
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