Dell 5535dn Service Manual page 260

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.
Multi-purpose feeder (MPF)
The MPF is a mechanical unit supplying media to the printer. The driving force from the main drive motor drive
motor is transmitted to the MPF pick roll to feed media.
MPF pick solenoid
MPF feed roll
The MPF pick roll feeds the media set on the MPF into the printer.
MPF pick solenoid
The MPF pick solenoid transmits the driving force from the main drive motor assembly to the MPF pick roll.
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Service Manual
Sensor (MPF media empty)
MPF pick roll assembly