Lexmark C 950 Service Manual

							Repair information 4-177
  5058-030
Go Back Previous
Next
Transfer belt lever removal
1.Open the front door.
2.Rotate the transfer belt lever counterclockwise to the unlock position.
3.Remove the screw (A) from the transfer belt lever.
A 
						

							4-178  Service Manual 5058-030  
Go Back Previous
Next
4.Remove the transfer belt lever.
Transfer roll HVPS PCBA removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-16.
2.Disconnect the input option cable (A). 
						

							Repair information 4-179
  5058-030
Go Back Previous
Next
3.Remove the eight screws (B) securing the PCBA door to the machine.
4.Release the two clamps (C) to release the harness.
5.Swing the PCBA door open. 
						

							4-180  Service Manual 5058-030  
Go Back Previous
Next
6.Disconnect the cable (D).
7.Remove the four screws (E) securing the transfer roll HVPS PCBA to the machine. 
						

							Repair information 4-181
  5058-030
Go Back Previous
Next
8.Release the tabs on the two plastic standoffs (F) securing the transfer roll HVPS PCBA to the machine.
9.Remove the transfer roll HVPS PCBA from the machine.
Upper exhaust cooling fan removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-16.
2.Disconnect the input option cable (A). 
						

							4-182  Service Manual 5058-030  
Go Back Previous
Next
3.Remove the eight screws (B) securing the PCBA door to the machine.
4.Release the two clamps (C) to release the harness.
5.Swing the PCBA door open. 
						

							Repair information 4-183
  5058-030
Go Back Previous
Next
6.Disconnect the cable (D).
7.Remove the upper exhaust cooling fan.
Re-installation note: When replacing the upper exhaust cooling fan, make sure the fan is positioned so that the 
air flow is directed away from the machine.  
						

							4-184  Service Manual 5058-030  
Go Back Previous
Next
Upper printer engine PCBA removal
1.Remove the rear upper cover. See “Rear upper cover removal” on page 4-16.
2.Disconnect the input option cable (A).
3.Remove the lower engine PCBA. See “Lower engine PCBA removal” on page 4-101.
4.Disconnect all the cables from the upper printer engine PCBA.
5.Remove the six screws (B).
WARNING
Ensure that the EPROM is removed from the defective PCBA and installed to the new PCBA 
or damage to the machine may occur. For more details, go to “Upper engine PCBA 
reinstallation” on page 4-185. 
						

							Repair information 4-185
  5058-030
Go Back Previous
Next
6.Detach the upper printer engine PCBA by moving it to the right.
7.Remove the upper printer engine PCBA.
Upper engine PCBA reinstallation
1.Install the NVM EPROM from the defective PCBA to the replacement PCBA.
1.1Remove the NVM EPROM from the defective PCBA using a chip puller. Hold the chip on the touch 
positions shown, then gently pull the chip away from the board. 
Warning:  The chip must be pulled away in the direction perpendicular to the PCBA. The pins may get 
deformed if the chip is not pulled straight and evenly.
WARNING
Failure to perform this procedure correctly may cause:
• damage to the replacement PCBA
• loss of memory settings 
						

							4-186  Service Manual 5058-030  
Go Back Previous
Next
1.2Mount the NVM EPROM to the replacement PCBA.
Warning:  Failure to correctly mount the NVM EPROM chip may cause damage to the system. The correct 
orientation of the chip when mounted to the board is shown below. Pin 1 of the NVM EPROM chip (marked 
with a circle) must be inserted to the correct slot (marked with a triangle) on the replacement PCBA. 
2.Install the replacement PCBA to the machine.
Warning:  Ensure that the cables are properly reconnected, or damage will occur.
3.Turn on the machine. 
4.An error will occur on the system. To clear the error, press the power button on the operator panel to put 
the machine in hibernate mode.
Warning:  Shutting down using the operator panel button is required to update the memory settings from 
the old NVM EPROM and save it to the current system. Failure to to shut down correctly may cause loss of 
memory settings.
Upper redrive assembly removal
1.Open the printer left duplex door assembly.
2.Remove the left upper cover. See “Left upper cover removal” on page 4-6.