Key Components; Sensors; Trailing Edge Sensor; Toner Density Sensor - Lexmark MS312 Service Manual

Key components

Sensors

Fuser exit
sensor
Trailing edge
sensor

Trailing edge sensor

Detects the media's trailing edge as it passes the pick tires. Among other capabilities, this sensor can be used to
determine the paper size sensor and the media stack height.
MPF sensor
Detects the presence of media in the MPF tray.
Media present sensor
Detects the presence of media in the tray.
Tray present sensor
Detects the presence of the tray in the printer.
Bin full sensor
Detects whether the standard bin is full by moving the actuator up and down.

Toner density sensor

Detects a pre-placed toner patch and image on the photoconductor (drum) and outputs pulses when the central line
of the patch image aligns with the central line of the detector. The sensor outputs pulses at the timing the patch image
passes the sensor. Therefore, observing changes of intervals at which pulses are output leads to toner density detection.
Bin full sensor
Media present Trailing edge
sensor
Appendix C: Theory of operation
273
Input sensor
MPF paper present
Duplex sensor
Pass through
Index sensor
sensor
sensor
sensor
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