Jam Detection; Overview - Canon SADDLE FINISHER K3 Service Manual

CHAPTER 2 OPERATION OVERVIEW

13.5 Jam Detection

13.5.1 Overview

The folder is equipped with seven sensors as shown in Figure F02-1305-01 to detect
whether the paper is being fed properly. Jamming is judged by reading the signals from the
sensors at times pre-programmed in the CPU of the finisher controller PCB. If the CPU
judges that jamming has occurred, the finisher controller PCB sends a jam signal to the
copier. As a result, the copier stops copying and the error message 'Check paper feed' is dis-
played on the copier's control panel.
The CPU judges that jamming has occurred in the following cases:
a. when paper is detected by a sensor when the power supply is turned on, when warm-
ing up is completed, or during standby (power-on jam)
b. when the paper does not reach the sensors within the specified time (delay jam)
c. when the paper does not pass the sensors within the specified time (stationary jam)
d. when the top cover is opened while the folder is in operation (door open jam).
If any of the jams described above occurs, the jam should be cleared first. Then, the re-
maining number of copies can be copied automatically by pressing the Copy Start key
again.
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COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON SADDLE FINISHER K3/K4 REV.0 MAR. 2001