Detecting Jams; Delay Jams; Delay Jam Outside The Cassette Pickup Assembly; Delay Jam In The Cassette Pickup Assembly - Canon iR3245 Series Service Manual
A delay jam outside the cassette pickup assembly is identified as follows:
The length of time it takes for paper to move from the sensor N-1 to the delay jam sensor N is kept under control; a delay jam is identified if the delay jam sensor
does not go on within a specific length of time after the sensor N has gone on.