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SESE
Se
OPERATIONS AND TIMING Gl
E. Detecting Jams
The copier is equipped with two copy paper sensors to check the presence/absence of
copy paper and whether it is moving normally.
* pre-registration roller paper sensor (Q751)
¢ delivery sensor (PS3)
The presence/absence
of copy paper or a jam is checked in reference to the
presence/absence of copy paper at the respective sensors at such times as stored in the micro-
processor in advance.
The copier keeps a record of the remaining number of copies to make or the copy mode
effective at time of a jam. The microprocessor has the following five 'no paper/jam' detection
sequences, and it also identifies a jam if any of the sensor detects copy paper at power-on.
1.
Absence of Paper in the Multifeeder Pick-Up Assembly (pick-up delay jam)
In multifeeder mode, if copy.paper does not reach the registration sensor within a specific
period of time, the copier identifies a jam, stops the main motor in about 3 sec, and indicates
the Add Paper message. !f the registration sensor detect copy paper within this 3-min period
(approx.), the copier identifies a pick-up delay jam and flashes the Jam message.
Copy Start key
ON
Main motor (M1
Figure 3-418 (normal)
COPYRIGHT © 1995 CANON INC.
CANON NP6O12/NP6012F/NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIME
AU JAPON)
3-59
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