Lexmark C 950 Service Manual

							Repair information 4-37
  5058-030
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Charge roll HVPS 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).
3.Remove the eight screws (B) securing the PCBA door to the machine. 
						

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4.Release the two clamps (C) to release the harness.
5.Swing the PCBA door open.
Note: The cables do not have to be removed from the main power GFI interface to remove this part. Just pull the 
main power GFI interface out of the machine and swing it out of the way. 
6.Remove the main power GFI interface, or just move it so that you can get to the charge roll HVPS cooling 
fan. See the 
“Main power GFI interface removal” on page 4-116.
7.Disconnect the cable (D) from the charge roll HVPS cooling fan.
8.Remove the screw (E) securing the charge roll HVPS cooling fan to the machine.
9.Gently raise the large cable harness and remove the charge roll HVPS cooling fan.  
						

							Repair information 4-39
  5058-030
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Charge roll HVPS PCBA removal
1.Remove the printer right side cover. See “Printer right cover removal” on page 4-11.
2.Remove the waste toner sensor guide. See “Waste toner sensor guide removal” on page 4-193.
3.Remove the two screws (A) securing the charge roll HVPS PCBA. 
						

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4.Remove the connection (B) from the charge roll HVPS PCBA.
5.Using the metal tabs (C), gently pull the charge roll HVPS PCBA and remove from the machine. 
Re-installation note: When replacing the charge roll HVPS PCBA, ensure that it is properly inserted into the 
socket in the machine. 
CMYK toner dispense auger assembly removal
1.Remove the operator panel front cover. 
2.Remove the top cover. See “Printer top cover removal” on page 4-12.
3.Remove the printer front door. See “Printer front door removal” on page 4-10.
4.Remove the transfer belt cleaner. See “Transfer belt cleaner removal” on page 4-175.
5.Remove the waste toner box.
6.Remove the four photoconductor units.
7.Remove the four toner supplies.
8.Remove the printhead retract door. See “Printhead retract door removal” on page 4-142.
9.Remove the inner cover. See “Inner cover removal” on page 4-3.
10.Remove the inner plate. See “Inner plate removal” on page 4-95. 
						

							Repair information 4-41
  5058-030
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11.Remove the three screws (A) securing the CMYK toner dispense auger assembly to the printer.
12.Lift the four plastic gates and push them into their corresponding toners to prevent the toner from spilling.
13.Gently detach the lower portions (B) of the four augers from the developer housings.
A
21 
						

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Warning:  The lower portion (B) of the augers are prone to damage. Extra care is required in handling these 
parts.
14.Disengage the CMYK toner dispense auger assembly and remove.
Note:  After removal of the CMYK toner dispense auger assembly, be sure to clean up all visible toner spillage.
B
C 
						

							Repair information 4-43
  5058-030
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Re-installation note: Be sure to attach the rubber sleeves (C) properly to prevent toner spillage.
Controller 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).
3.Remove the eight screws (B) securing the PCBA door to the machine. 
						

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4.Release the two clamps (C) to release the harness.
5.Swing the PCBA door open.
6.Remove the two screws (D) securing the controller cooling fan.
7.Remove the controller cooling fan from the machine.
8.Disconnect the harness from the clamp (E).
9.Disconnect the cable (F) from the controller cooling fan. 
						

							Repair information 4-45
  5058-030
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Developer carrier removal and replacement
Note:  The following procedure can be applied to the C, M, Y, and K developer carriers.
Warning:  Always perform the sensor (ATC sensor) setup and adjustment if required or print quality 
problems may occur. Go to 
“Sensor (ATC) setup” on page 4-392.
1.Remove the appropriate developer housing. See “Developer housing (C) removal” on page 4-48, 
“Developer housing (M) removal” on page 4-59, “Developer housing (Y) removal” on page 4-65, or 
“Developer housing (K) removal” on page 4-54.
2.Remove the printer front door. See “Printer front door removal” on page 4-10.
3.Remove the transfer belt cleaner. See “Transfer belt cleaner removal” on page 4-175.
4.Remove the waste toner box. 
5.Remove the four photoconductor units.
6.Remove the four toner supplies.
7.Remove the operator panel left cover. 
8.Remove the operator panel right cover. 
9.Remove the operator panel front cover. 
10.Remove the printhead retract door. See “Printhead retract door removal” on page 4-142.
11.Remove the inner cover. See “Inner cover removal” on page 4-3.
12.Remove the inner plate. See “Inner plate removal” on page 4-95.
13.Using a prying tool, gently release the two hooks securing the top cover (A) to the assembly. 
						

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14.Remove the top cover (A).
15.Completely remove the carrier (B) from the assembly by dumping it and using a toner vacuum or if 
installing a new developer unit assembly, go to next step.