COPYRIGHT © 2002 CANON INC.
2000 2000 2000 2000
CANON iR1200/iR1300 Series REV. 0 AUG. 2002
CHAPTER 4 OPERATION
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5.5 Detecting Jams
5.5.1 Outline
The machine is equipped with 6 sensors used to detect jams.
The presence/absence of paper is checked with reference to the state of each sensor at
such times as stored in the CPU on the DC controller PCB. When the machine detects a jam,
it will turn off the main motor (M1) and will indicate a jam message on the LCD.
5.5.2 Types of Jams
The machine groups jams into 8 types. When a jam occurs, be sure to remove it, and start
over the operation.
a. Pickup Delay Jam
After execution of a pickup retry, the paper leading edge sensor (PS102) does not detect
the leading edge of paper within a specific period of time, or no paper exists at time of a
pickup retry.
b. Paper Leading Edge Sensor Stationary Jam
After the paper leading edge sensor (PS102) has detected the leading edge of paper, the
paper leading edge sensor (PS102) does not detect the trailing edge of paper within a spe-
cific period of time.
c. Delivery Sensor Leading Edge Delay Jam
After the paper leading edge sensor (PS102) has detected the leading edge of paper, the
delivery sensor (PS3) does not detect the trailing edge of paper within a specific period of
time.
d. Fixing Wrap Jam
After the delivery sensor (PS3) has detected the leading edge of paper, the delivery sensor
(PS3) detects the absence of paper before a specific period of time.
e. Delivery Sensor Trailing Edge Delay Jam
After the delivery sensor (PS3) has detected the leading edge of paper, the delivery sensor
(PS3) does not detect the trailing edge of paper within a specific period of time.
f. Delivery Sensor Stationary Jam
• As part of operation after a pickup delay jam, the delivery sensor (PS3) detects the
trailing edge of paper; however, the delivery sensor (PS3) once again detects the trail-
ing edge of paper, the laser is forced OFF, and a specific period of time passes.
• As part of operation after a pickup delay jam, the delivery sensor (PS3) detects paper,
the laser is forced OFF, and a specific period of time passes.
• At time of cleaning the fixing pressure roller, the trailing edge of paper does not move
past the delivery sensor (PS3; i.e., the sensor does not go OFF) within a specific pe-
riod of time.
