Canon LaserBase MF3220 Series, Service Manual

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Chapter 2
2-5
2.4.3 Detection Jams
2.4.3.1 Jam Detection Outline
2.4.3.1.1 Type so Jams
0012-0906
The machine identifies the following types of jams:
Pickup Delay Jam
The top sensor does not go on within a specific period of time after pickup starts.
Pickup Stationary Jam
The top sensor goes on, but does not go off within a specific period of time.
Delivery Delay Jam
The top sensor goes on, but the delivery sensor does not go on within a specific period of time.
Wrap Jam
The delivery sensor goes on, but it goes off before a specific period of time passes.
Delivery Stationary Jam
The delivery sensor goes on, but it does not go off within a specific period of time.
Initial Jam
The top sensor or the delivery sensor goes on while the main motor is starting to rotate.
Cover Open Jam
The machine identifies a condition in which the front cover is opened while it is moving paper.
2.4.3.2 Delay Jams
2.4.3.2.1 Pickup Delay Jam
0012-0907
If the top sensor does not detect the leading edge of paper within 1.2 sec after the start of pickup operation, the machine initiates pickup operation once gain. The
machine identifies a pickup delay jam if the top sensor does not detect the leading edge of paper within 1.2 sec after the 2nd pickup operation.
2.4.3.2.2 Delivery Delay Jam
0012-0908
The machine identifies a delay jam if the delivery sensor does not detect the leading edge of paper within 1.615 sec after the top sensor has detected the leading
edge of paper.
2.4.3.3 Stationary Jams
2.4.3.3.1 Pickup Stationary Jam
0012-0909
The machine identifies a pickup stationary jam if the top sensor does not detect the absence of paper within 3.575 sec after the top sensor has detected the leading
edge of paper.
2.4.3.3.2 Delivery Stationary Jam
0012-0911
The machine moves to a delivery stationary jam sequence if it does not detect a wrap jam.
The machine identifies a delivery stationary jam if the delivery sensor does not detect the trailing edge of paper for 1.715 sec after the top sensor has detected the
trailing edge of paper.
2.4.3.4 Other Jams
2.4.3.4.1 Wrap Jam
0012-0912
The machine starts a wrap jam detection sequence in 0.1 sec if it does not detect a delivery delay jam.
It identifies a wrap jam if the delivery sensor detects the trailing edge of paper within 1.06 sec after the top sensor has detected the trailing edge of paper.
The term "wrap jam" refers to paper that wraps around the fixing pressure roller; its leading edge passes through the delivery sensor, but it jams thereafter. The
machine is designed to identify such a jam so as to prevent wrapping paper from fully moving into the fixing assembly.
2.4.3.4.2 Initial Jam
0012-0913
The machine identifies an initial jam if the top sensor or the delivery sensor detects the presence of paper when the main motor starts to rotate.
2.4.3.4.3 Cover Open Jam
0012-0914
The machine identifies a cover open jam if it detects that the front cover is open with the top sensor or the delivery sensor detecting the presence of paper (while
paper is being moved or the machine is not running a jam check).