Lexmark C 950 Service Manual

Diagnostic aids 3-129
  5058-030
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Tray lifting
Tray lift operation starts automatically when the HCF media tray is inserted with media loaded.
Media is lifted and stops at the feeding position. At the same time, detection of no media and remaining media 
volume becomes available.
Media out detection
This function checks whether media is loaded in the HCF media tray.
When media is present, the media out actuator in the middle of the HCF is raised as media is lifted, and leaves 
the...

3-130  Service Manual 5058-030  
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If the HCF media tray is not lifted, the media out actuator remains in the sensing area of the sensor (media out), 
while blocking the light transmission of the sensor (media out). Media out is detected regardless of the presence 
of media in the tray.
Detection of media out is carried out constantly after the lifting operation is completed.
When media out is detected, media transfer from the HCF is inhibited.
If media out is detected during...

Diagnostic aids 3-131
  5058-030
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•When the power is turned off and on while the tray is at the feeding position, the sensor (media level) is on 
when the power is turned on, and the remaining media volume before the previous power off is regarded 
as the remaining media volume.
•If the sensor (media level) is off when the power is turned on, the HCF regards the HCF media tray as 
having been removed, and determines the remaining media volume based on the time from the media feed...

3-132  Service Manual 5058-030  
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Repair information 4-1
  5058-030
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4.  Repair information
Warning:  Read the following before handling electronic parts.
Handling ESD-sensitive parts 
Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent 
damage to ESD-sensitive parts, use the following instructions in addition to all the usual precautions, such as 
turning off power before removing logic boards:
•Keep the ESD-sensitive part in its original shipping container...

4-2  Service Manual 5058-030  
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Removal procedures
Notes:  
•Some removal procedures require removing cable ties. You must replace cable ties during reassembly to 
avoid pinching wires, obstructing the paper path, or restricting mechanical movement.
•Remove the waste toner bottle, color toner cartridges, imaging unit, and media tray before removing other 
printer parts. The imagine unit should be carefully set on a clean, smooth, and flat surface. It should also 
be protected from...

Repair information 4-3
  5058-030
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Cover removal procedures
Inner cover removal
1.Remove the printer front door. See “Printer front door removal” on page 4-10.
2.Remove the transfer belt cleaner. See “Transfer belt cleaner removal” on page 4-175.
3.Remove the waste toner box.
4.Rotate the transfer belt lever counterclockwise to the unlock position.
5.Open the printhead retract door.
6.Remove the four photoconductor units.
7.Remove the four toner supplies.
8.Remove the operator panel...

4-4  Service Manual 5058-030  
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11.Remove the six screws (A) from the inner cover.
12.Remove the inner cover.
A 

Repair information 4-5
  5058-030
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Internal rear cover removal
1.Remove the top cover. See “Printer top cover removal” on page 4-12.
2.Remove the two screws (A) from the internal rear cover.
3.Remove the internal rear cover.
A 

4-6  Service Manual 5058-030  
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Left rear lower cover removal
1.Open the printer left duplex door.
2.Remove the two screws (A).
3.Remove the left rear lower cover.
Left upper cover removal
1.Open the printer left duplex door.
2.Open the upper redrive door.
3.Remove the two screws (A).
4.Remove the left upper cover.