Sensor (Media Level) - Lexmark X850e Service Manual

7500-XXX
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If the sensor (media level) is off when the power is turned on, the HCF regards the HCF media tray as
having been removed, and determines the remaining media volume based on the time from the media feed
lift motor forward/reverse rotation until the sensor (media level) comes on.

Sensor (media level)

Detects the media feeding position in the tray in order to control the media position.
While this sensor (media level) is off, lifting the tray is continued until the sensor (media level) turns on.
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Options Service Manual
Sensor (media level)
HCF pick solenoid
HCF feed lift motor