Paper Feeding; Cassette Paper Feeder - Lexmark C920 Service Manual

Paper feeding

The paper feeder is a two-way system composed of the multi-paper feeder (100 sheets maximum) and an
integrated 550-sheet tray. Optionally, the expansion paper feeders (550 sheets) can be increased to four layers.
A high-capacity paper feeding system (3,000 sheets) may be used. Combining the multi-paper feeder,
expansion paper feeders, and high-capacity paper feeding system gives the printer a maximum paper supply of
up to 5,850 sheets.

Cassette paper feeder

The paper is raised to the proper paper-feed level by the paper tray lift motor when the cassette is replaced or
when the paper present / level sensor is in the open position. If the sensor is in the open position, the printer
controller board sends a signal to the paper tray lift motor to lift the tray.
The tray will continue to lift until the paper in the tray reaches the proper height and moves the paper present
actuator. This will close the sensor and the paper tray lift motor will stop. In this raised position, the paper will be
ready to feed to the engine.
Note: To prevent a jam due to paper depletion, there is a second ball actuator that places the paper out
sensor in the closed position. If the paper out sensor is in the open position when the paper present / level
sensor is in the closed position, the printer will signal that the tray is out of paper when a print job is sent.
Paper is fed into the printer when a signal is sent from the printer controller board to the paper feed clutch. This
signal causes the paper feed roll shaft to rotate in a counterclockwise direction. The paper feed shaft also drives
a gear which drives the pick roll. When the pick roll rotates, it sends the top sheet of paper in the cassette to the
relay rollers inside the printer.
Double feeds are prevented by a separator roll that rotates in the opposite direction. If more than one sheet is
pulled by the pick roller, the separator roller will hold back the additional sheets of paper. This theoretically will
prevent a jam from occurring.
5056-XXX
3-29
Diagnostic aids