Hcf Media Feed Unit Assembly Sensor/Motor Functions - Lexmark X850e Service Manual

7500-XXX

HCF media feed unit assembly sensor/motor functions

Functions of the sensors and motors of the media feed unit assembly are outlined below.
•
HCF media feed lift motor–is a stepping motor that rotates (forward) the pick roll and feed roll to send
media from the tray to the HCF media transport roll assembly. The motor also lifts the tray by reverse
rotation.
•
HCF pick solenoid–Raises or lowers the pick roll. The HCF pick solenoid stays activated from the
beginning of media feed until the sensor (pre-feed) turns on. The HCF pick solenoid is activated when the
tray is inserted and when the power is turned on to check the presence of media in the tray.
•
Sensor (pre-feed–Detects whether media has been fed from the tray, and controls the HCF feed lift
motor speed. The sensor also becomes a trigger to deactivate the HCF pick solenoid. The sensor turns on
upon detecting media, and determines that media is present.
•
HCF transport motor–is a stepping motor that rotates the HCF media transport roll assembly to feed
media to the printer.
•
Sensor (tray 5 feed-out)–Detects whether media has been fed from the tray, becomes a trigger to stop
the HCF feed lift motor, and controls the HCF transport motor speed.
The sensor turns on (light receiving) upon detecting media, and determines that media is present.
Sensor
(media out)
Front
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Options Service Manual
Sensor (media level)
Sensor (pre-feed)
HCF pick solenoid
HCF feed lift motor
HCF transport motor
Sensor (tray 5 feed-out)