Jam Detection

Fusing Unit Paper Sensors

Sensor name	Fusing exit sensor [A]	Accordion jam sensor [B]	Fusing belt sensor [C]
Sensor type	Photo interrupt	Photo interrupt	Photo interrupt
Location	Below paper path at fusing unit exit	Below paper path at fusing unit exit	Above paper path at fusing unit exit
Function	Times the arrival and exit of paper to detect late and lag paper jams during paper feed.	Detects paper remaining at the fusing nip that has not separated at the separation plate.	Detects paper by comparing the reflectivity of paper and belt to detect paper that wraps around the belt.
Jam detection?	Yes	No	No
Paper remains detection?	Yes	Yes	Yes
	Detects paper that fails to leave the fusing unit exit.	Detects accordion jams at the fusing unit nip.	Detects paper that wraps around the fusing belt.

The machine checks for paper remaining in the fusing unit when the machine is turned on and every time the front doors are closed.