Lexmark C 950 Service Manual

Diagnostic aids 3-109
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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/W1S/W3
No TrayOffOff
B5L/7.25” x 10.5”LOffOn
8.5” x 11”LOnOff
A4LOnOn 

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3TM theory of operations 

Diagnostic aids 3-111
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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. 
Media transport path 
The following is a cross section of the printer and the 3TM, 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...

3-112  Service Manual 5058-030  
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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...

Diagnostic aids 3-113
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Sensor (media level)
This sensor detects by the actuator position whether media in the media tray assembly is lifted. When the flag of 
the actuator leaves the sensor (media level) sensing area, the sensor detects that the media has been lifted.
 
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...

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Sensor (tray 4 feed-out)
The sensor (tray 4 feed-out) detects media fed from the tray 4.
Tray module media transport roll assembly 
The tray module transport roll assembly feeds media from the tray 3 or tray 4 to the printer.
Tray module drive motor 
This motor is used to drive the media transport mechanism in the tray module.
3TM controller card assembly
The 3TM controller card assembly, which contains a CPU, controls media feed in the tandem tray...

Diagnostic aids 3-115
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Switch (media size)
The following table gives on/off states of the switches on the switch (media size), corresponding to the media 
sizes of the media tray assembly.
Note:  The switches (media size) are denoted by “S/W1” and “S/W3” respectively from the left side.
Media SizeAnalog switch
S/W1S/W3
No TrayOffOff
B5L/7.25” x 10.5”LOffOn
8.5” x 11”LOnOff
A4LOnOn 

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1TM theory of operations 

Diagnostic aids 3-117
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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.
Media transport path 
The following is a cross section of the printer and the 1TM, showing the main components directly associated 
with the media path and transport.  
Functions of main components 
When the 1TM is installed under the printer, additional trays are available.
Media tray assembly 
It is...

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Tray 2 media tray assembly  
1TM media feed units
Media feed unit assembly
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 transmitted to the three roll 
assemblies to feed media.
When the pick roll picks up sheets of media and the remaining media decreases, the media level actuator of the 
sensor (media...