Detecting Jams In The Duplexing Unit - Canon CP660 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
B.

Detecting Jams in the Duplexing Unit

The 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 of
paper at a specific sensor at such times as programmed in the microprocessor (CPU) on
the 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
* Reader controller PCB (when making prints with the reader unit installed).
Note:
T1 and T2 times represent minimum print size and maximum print size.
1. Reversing Assembly Delay Jam
The duplexing driver PCB will identify a reversing assembly delay jam if the paper
does not reach the reversal paper sensor (PS26) within a specific time after the duplex-
ing flapper solenoid has turned on.
Duplexing flapper solenoid
drive signal
Jam check
Reversal paper sensor
Duplexing motor
5-32
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Figure 5-502
CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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