User Guide

CHAPTER 5 PICK-UP/FEEDING SYSTEM
COPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 5-8
Figure 5-109
1. Multifeeder Pickup Assembly (no paper, pickup delay jam)
If copy paper does not reach the pre-registration roller paper sensor within a specific period of
time in multifeeder mode, the condition will be identified as the absence of paper; the machine will
stop the main motor in about 1.5 sec, and indicate the Add Paper message.
If the pre-registration roller paper sensor detects copy paper during this 1.5 sec period (ap-
proximate), the machine will identify the condition as a pickup delay jam, and flash the Jam indica-
tor.
Multifeeder pickup roller
Cassette
pickup roller
Vertical
path
roller
Q751
PS4
Photosensitive drum
Cassette
Fixing assembly
Delivery roller
PS3
Registration roller
D. Detecting Jams
The machine is equipped with three paper sensors used to find out the presence/absence of
copy paper and whether copy paper is moving properly.
• Vertical path roller paper sensor (PS4)
• Pre-registration roller paper sensor (Q751)
• Delivery sensor (PS3)
The presence/absence of a jam is checked with reference to the presence/absence of paper over
a specific sensor at such times as programmed in the microprocessor.
The machine keeps a record of the remaining number of copies to make or the copy mode
effective at time of a jam.
The microprocessor possesses the following seven types of no paper/jam detection sequence; if
any of its sensors detects copy paper at power-on, the machine will identify the condition as a jam.
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