Jam Detection - Canon NP6320 Service Manual

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 (Q5)
Paper jams can be identified by the microprocessor by reading signals from the sensors at
predetermined times to check if paper is at or not at a sensor at that time, and thus identify if the
paper is moving through the copier correctly.
If a jam occurs, the copier memorizes the number of copies that have not yet been 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 in order to reset 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.
COPYRIGHT © 1999 CANON INC.
Download Service Manual And Resetter Printer at http://printer1.blogspot.com
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 5 PICK-UP/FEEDING SYSTEM
5-7