Lexmark C 950 Service Manual

Repair information 4-177
  5058-030
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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 

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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). 

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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. 

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6.Disconnect the cable (D).
7.Remove the four screws (E) securing the transfer roll HVPS PCBA to the machine. 

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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). 

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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. 

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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.  

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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....

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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...

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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...