Lexmark X940e Owners Manual

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Bottom plate
The force pushing up the bottom plate is transmitted by the driving force of the motor on the media feed unit 
assembly. The bottom plate is pushed up by the rotation of the lift up shaft, which causes the supplied media to 
come in contact with the pick roll.
The force pushing up the bottom plate of tray 3 is transmitted by the driving force of the media feed lift motor on 
the media feed unit assembly to the media lift shaft assembly...

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Tray 3 or 4 media tray assembly  
Rear lift cables
Rear media guide
Bottom plate
F/R lift cable
F/L lift cable 

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TTM media feed units 
Media feed unit assembly
Since the tray 3 and tray 4 are functionally equivalent in terms of the switch (TTM media size), sensor (media 
out), sensor (media level) and sensor (pre-feed), only the components of one tray are described here.
The media feed unit assembly is a mechanical unit supplying media from the media tray assembly to the printer. 
The driving force from the media feed lift motor on the media feed unit assembly is...

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Main components 
Switch (tray module left door interlock) 
The switch (tray module left door interlock) detects open/close of the tray module left door assembly.
Sensor (tray 2 feed-out)
The sensor (tray 2 feed-out) detects media fed from trays 2, 3, or 4.
Sensor (tray 3 feed-out)
The sensor (tray 3 feed-out) detects media fed from the tray 3 or tray 4.
Sensor (tray 4 feed-out)
The sensor (tray 4 feed-out) detects media fed from the tray 4.
Tray module media...

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Tray module drive motor 
This motor is used to drive the media transport mechanism in the tray module.
TTM tray 4 media transport motor
This motor is used in the TTM to transport media from the tray 4 towards the tray module left door assembly.
TTM controller card assembly
The TTM controller card assembly, which contains a CPU, controls media feed in the tandem tray module upon 
receiving a command from the upper printer engine card assembly and...

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Switch (TTM media size)
The following table gives on/off states of the switches on the switch (TTM media size), corresponding to the 
media sizes of the media tray assembly.
Note:  The switches (TTM media size) are denoted by “S/W1” and “S/W3” respectively from the left side.
Media SizeAnalog switch
S/W1 S/W3
No Tray Off Off
B5L/7.25” x 10.5”L Off On
8.5” x 11”L On Off
A4L On On 

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3TM theory  

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Media transport 
Media transport path
Media is supplied from tray 3 or tray 4, and is transported to the printer along the media transport path shown 
below.
Pick rollPick roll
Separation rollSeparation roll
Feed roll
Transfer belt 2nd transfer roll assembly
Heat roll
Pressure roll
Fuser unit ASM
Standard media
exit roll assembly
Duplex media transport roll ASM
Duplex mediaCenter transport
roll ASM
Tray 3Tray 4
Feed roll
Tray module media Transport roll ASM...

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Media transport path
The following is a cross section of the printer and the tandem tray module, showing the main components 
directly associated with the media path and transport.
Functions of main components
When the 3TM is installed under the printer, additional trays are available.
Media tray assembly 
Media feed unit assembly
It is necessary to adjust the guide and the end guide in the media tray assembly to match the media size.
Rear media guide...

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Bottom plate
The force pushing up the bottom plate is transmitted by the driving force of the motor on the media feed unit 
assembly. The bottom plate is pushed up by the rotation of the lift up shaft, which causes the supplied media to 
come in contact with the pick roll.
Tray 2, 3, 4 media tray assembly  
3TM media feed units
Media feed unit assembly
Since the tray 2, tray 3, and tray 4 are functionally equivalent in terms of the switch (media size), sensor...