Lexmark C 950 Service Manual

Diagnostic aids 3-99
  5058-030
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• A sheet of media of less than 11 inches is stacked in the stacker 
media bin with the Staple Mode changed.
• An operator put a sheet (or sheets) when no media is remaining in the stacker media bin.
(The size and condition of media stacked in the tray are not identified.)
• Media was present in the stacker media bin when power was turned on.
(The size and condition of media stacked in the tray are not identified.)
• The finisher entered the Sleep...

3-100  Service Manual 5058-030  
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• Media eject clamp motor
–  A DC motor that elevates or lowers the media eject clamp when feeding media from the punch to the 
compiler unit assembly or from the compiler unit assembly to the stacker media bin.
• Sensor (media eject clamp HP)
–  A photo-interrupter sensor that detects the set clamp home position.
–  This sensor functions as a trigger to control On/Off of the set clamp clutch.
• Media eject clutch
–  When this clutch is activated, it...

Diagnostic aids 3-101
  5058-030
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When the front of the booklet tray is facing down, the printout will fall automatically below the tray. When 
removing paper, press booklet tray belt switch to move the paper delivery belt to the position for paper removal.
Power supply and interlock
The finisher is equipped with the following interlock switches.
• Switch (finisher front door interlock)—Turns off when the cover assembly front opens, shutting off the 
Interlock +24 V dc line in the...

3-102  Service Manual 5058-030  
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• Switch (eject cover interlock)—Turns off when the cover eject on the right side opens, shutting off the 
Interlock +24 V dc line in the finisher.
Switch (eject cover interlock)
Switch (finisher front door interlock)
AC
PrinterFinisher LVPS
card asm
+24Vdc
ON/OFFFinisher
controller
card asm
+5Vdc
+24Vdc
Interlock
+24Vdc
Sensor
Switch
(eject cover
interlock)Switch
(finisher
front door
interlock) 

Diagnostic aids 3-103
  5058-030
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TTM theory of operations 

3-104  Service Manual 5058-030  
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Media transport 
Media transport path
Media is supplied from tray 2, tray 3 or tray 4, and is transported to the printer along the media transport path.
The following is a cross section of the printer and the TTM, showing the main components directly associated 
with the media path and transport.   
Functions of main components 
When the TTM is installed under the printer, additional trays are available.
Media tray assembly
It is necessary to adjust...

Diagnostic aids 3-105
  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.
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...

3-106  Service Manual 5058-030  
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Tray 3 or 4 media tray assembly  
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...

Diagnostic aids 3-107
  5058-030
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Switch (TTM media size)
The switch (TTM media size) switches the setting of the size of media supplied from each media tray assembly. 
A signal indicating the set size is transmitted as a voltage to the printer engine card assembly.
Sensor (media out)
If there is no media in the media tray assembly, the media out actuator lowers and the flag of the media out 
actuator that has stayed in the sensor (media out) sensing area leaves there. Thus, the...

3-108  Service Manual 5058-030  
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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 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...