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OPERATIONS AND TIMING
COPYRIGHT
©
1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
J. Detecting Jams
As many as ten paper sensors (3 of which are in
the cassette unit) are used to find out whether copy
paper is moving normally.
• Vertical path roller 1 paper sensor (PS16)
• Vertical path roller 2 paper sensor (PS12)
• Registration sensor (PS6)
• Separation sensor (PS7)
• Delivery sensor (PS8)
• Cassette 3 vertical path sensor (PS1cu)
• Cassette 4 vertical path sensor (PS3cu)
• Cassette 5 vertical path sensor (PS5cu)
• Vertical path roller paper sensor (PS2; paper
deck pedestal)
A jam is identified at such times as instructed by
the program in the microprocessor and in relation to
the presence/absence of paper at specific sensors.
The machine is equipped with a mechanism to
remember how many copies remain to be made
and the current copy mode, and such jam information
remains even after you have opened the machine’s
front cover to remove jams.
The microprocessor holds the jam detection
sequences discussed hereafter to check for a jam,
and it identifies a jam also when a sensor detects
paper at power-on.
When a jam is identified, the microprocessor
immediately stops the machine operation and cuts
off the power to the fixing heater (H1); it then flashes
the JAM message on the control panel while flashing
the jam location indicator.
The activation of the jam detection mechanism
causes the copy count to remain unchanged.