Detecting Jams - Canon PC920 Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM
D.

Detecting Jams

The machine is equipped with four 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)
• Single-feeder paper sensor (PS5)
• 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 is not equipped with a function which remembers the remaining number of cop-
ies to make at time of a jam and the selected copying mode; in other words, it will be reset to
standard mode when it is opened and closed for the removal of the jam.
The microprocessor possesses the following eight 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.
Delivery roller
Fixing assembly
Cassette
Delivery roller
Fixing assembly
Cassette
5-12
Figure 5-113 (Multifeeder type)
Figure 5-114 (Single-feeder type)
COPYRIGHT © 1999 CANON INC.
Multifeeder pickup roller
Photosensitive drum
Registration roller
Q751
Cassette pickup
Photosensitive drum
Registration roller
Q751
Cassette pickup
CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
PS4
Vertical
path roller
roller
Single-feeder
pickup roller
PS5
PS4
Vertical
path roller
roller