Lexmark X940e Owners Manual

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Media feed/lift motor
This motor is activated to feed media and to lift the bottom plate. When feeding media, it rotates forward to drive 
the pick roll. When lifting the bottom plate, it rotates reversely to drive the tray module gears to lift the lift up 
shaft.
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 engine...

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The MPF is a mechanical unit suppling media to the printer. The driving force from the MPF/transport drive 
motor is transmitted to the MPF feed roll to feed media. 
MPF feed roll
The MPF feed rolls feed media set on the MPF and into the printer.
MPF pick solenoid
The MPF pick solenoid transmits the driving force from the MPF/transport drive to the MPF feed rolls.
Sensor (MPF media out)
The sensor (MPF media out) detects whether media is present on the MPF....

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Registration 
Sensor (registration)
The sensor (registration) is located just before the registration roll assembly can detect whether media exists in 
the registration path.
Sensor (transparency detect)
This sensor is used to detect transparency media in order to automatically adjust feed speed, charge biases and 
fuser temperatures.
Registration clutch
The registration clutch transmits the drive force of the K developer/transport drive motor to the...

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The registration roll assembly feeds the media at the precise moment to ensure that printed images are 
precisely placed. The registration roll assembly feeds media from all trays to the transfer belt.
Transfer 
Transfer belt drive motor assembly
This motor is used to rotate the transfer belt.
Transfer belt cleaning assembly
This assembly is used to remove residual toner images from the transfer belt after 2nd transfer and before the 
next print cycle....

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Transfer belt unit assembly
The transfer belt unit assembly contains the four 1st transfer rolls; these 1st transfer rolls are referred to as the 
CMYK transfer rolls. The CMYK transfer rolls are positively charged to remove the developed toner image from 
the four drums. The negatively charged toner image is attracted by positive charges on the surface of the 
transfer belt. Thus, the toner image is transferred from the drum surface to the transfer belt...

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Sensor (2nd transfer roll HP)
The sensor (2nd transfer roll HP) is used to detect the home position of the 2nd transfer roll assembly.
Printhead assembly
The printhead scans the four drum surface with four laser beams. It consists of four components: laser diode 
(LD) card assembly, printhead motor, polygon mirror, and four start of scan card assemblies.
1. LD card assembly — generates a laser beam with the four LDs. The beam is turned on or off according to...

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Conceptual diagram of an image created by scanning
Printhead 

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Y Laser Path
Polygon MirrorY drum
Sensor
(Y start of scan)
M Laser Path
Polygon MirrorM drum
Sensor
(M start of scan) 

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Printhead shutter
The printhead shutter tightly covers the slit glass through which laser beams from the printhead pass to write the 
four drums. To prevent the seal glass from becoming dirty, the shutter stays closed except when laser beams 
are written onto the drums. 
The printhead shutter motor assembly is used to prevent contamination from obstructing the printhead slit 
glasses. The printhead shutters for yellow, magenta, cyan and black are opened...

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Fuser
Heat roll
The heat roll is a hollow metal tube with a coated surface. This tube is heated by the inner heater lamp. The heat 
is applied to the media passing between the heat roll and pressure roll, fusing the toner on the media. 
Fuser cooling fan
Heat roll
Sensor (fuser exit)
Pressure
belt
Thumb
screws