Detecting Jams; Jam Detection Outline; Delivery Jams; Stationary Jams - Canon iR1200 Series Service Manual

7.2 Detecting Jams

7.2.1 Jam Detection Outline

7.2.1.1 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.
7.2.1.2 Types of Jams
The machine groups jams into 8 types. When a jam occurs, be sure to remove it, and start over the operation.

7.2.2 Delivery Jams

7.2.2.1 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.
7.2.2.2 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.
7.2.2.3 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.

7.2.3 Stationary Jams

7.2.3.1 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 specific period of time.
7.2.3.2 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 trailing edge of paper, the laser is forced OFF, and a specific
period of time passes.
Chapter 7
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