Lexmark T652 Service Manual page 548

Switch (media size)
This switch (media size) sets the size of media supplied from each media tray assembly. A signal indicating the
media size is transmitted as a voltage to the printer system card assembly.
Sensor (media empty)
If media runs out in a media tray assembly, the actuator lowers and the actuator flag, unlocks the sensing area
of the sensor (media empty). The sensor light is transmitted. When the sensing area is blocked (media is present),
the signal is off.
Sensor (media low)
This sensor detects by the actuator position whether media in the media tray assembly is low. When the flag
of the actuator blocks, then unblocks the sensing area of the sensor (media low), the media level is determined
to be low.
Sensor (pass-thru)
A photointerrupter sensor with a built-in flag that sends a signal to the engine where the media from the input
tray passes. This will trigger the pick arm to pick the next media.
# Part
1 Pick arm assembly
2 Sensor (pass through)
3 250-sheet drawer assembly
4 Sensor (media low)
5 Sensor (media empty)
Appendix C: Theory of operation
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