COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)B. Detecting Jams in the Duplexing UnitThe printer unit is equipped with the following paper sensors to check the pres-ence/absence of paper or to find out whether paper is moving normally:• Duplexing unit paper sensor (PS24)• Reversal paper sensor (PS26)The presence/absence of a jam is checked in relation to the presence/absence ofpaper at a specific sensor at such times as programmed in the microprocessor (CPU) onthe duplexing driver PCB.When the CPU identifies a jam, it stops the ongoing duplexing feeding operation and,at the same time, communicates the fact to the printer board *1.*1 Reader controller PCB (when making prints with the reader unit installed).1. Reversing Assembly Delay JamThe duplexing driver PCB will identify a reversing assembly delay jam if the paperdoes not reach the reversal paper sensor (PS26) within a specific time after the duplex-ing flapper solenoid has turned on.Figure 5-502CHAPTER 5 PICK-UP/FEEDING SYSTEM5-32(unit: sec) (unit: sec)COPYErrorNormal1.5 1.5COPYJam checkReversal paper sensorDuplexing motorDuplexing flapper solenoiddrive signalCCWNote:T1 and T2 times represent minimum print size and maximum print size.Download free service manual at http://printer1.blogspot.com
