Lexmark C 950 Service Manual

							Diagnostic information 2-241
  5058-030
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3Check the four PC cartridges for spots or other damage 
on the drum surfaces.
 Are the PC cartridges free of excess wear and 
contamination?
Go to step 4.Replace the 
appropriate PC 
cartridge or 
connector.
4Print the print quality page suite.
 Do the spots repeat for a given color?
Replace the 
appropriate 
printhead. Go to 
“LED printhead removal” on page 4-99.
Go to step 5.
5Check the heat belt and pressure roll in the fuser 
assembly for scratches or defects.
CAUTION: The fuser assembly might be hot. 
Allow the fuser assembly to cool. 
Remove the fuser assembly.
 Is there contamination or cracks on the heat belt 
and/or pressure roll?
Replace the 
fuser assembly.
Go to “Fuser assembly removal” on page 4-81.
Go to step 6.
6Check the 2nd transfer roller for contamination and wear.
 Is the 2nd transfer roller free of excess wear and 
contamination?
Go to step 7.Replace the 2nd 
transfer roller.
Go to “2nd transfer roller removal” on page 4-24.
7Replace the transfer belt assembly. Go to “Transfer belt assembly removal” on page 4-171.
 Does the problem remain?
Go to step 8.Problem 
resolved
8Check the LED printhead.
Replace the LED printhead.
Go to “LED printhead removal” on page 4-99.
 Does the problem remain?
Go to step 9.Problem 
resolved
9Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the upper printer engine PCBA. 
Go to “Upper printer engine PCBA removal” on page 4-184.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem 
resolved
Step Check Yes No 
						

							2-242  Service Manual 5058-030  
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After image (ghosting) 
The ghost appears on the media which, may be the image from the previous page or part of the page currently 
printing. 
Step Check Yes No
1Check the media condition.
Load new, dry, recommended media.
Reprint the defective image.
 
Does the problem remain?Go to step 2. Problem 
resolved
2Check the four toner cartridges for proper installation.
Reprint the defective image.
 
Is the image density normal?Problem solved. Replace any 
empty toner 
cartridges.
3Check the heat belt and pressure roll in the fuser 
assembly for scratches or defects.
CAUTION: The fuser assembly might be 
hot. Allow the fuser assembly to cool. 
Remove the fuser assembly.
 
Is there contamination or cracks on the heat belt 
and/or pressure roll?Replace the 
fuser assembly.
Go to “Fuser 
assembly 
removal” on 
page 4-81.Go to step 4.
4Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the upper printer engine PCBA. 
Go to “Upper printer engine PCBA removal” on 
page 4-184.
Perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Replace the RIP 
PCBA.
Go to “RIP 
PCBA removal” 
on page 4-147.Problem 
resolved
Leading edge
Trailing edge 
						

							Diagnostic information 2-243
  5058-030
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Background fog  
StepCheckYesNo
1Check the media condition.
Load new, dry, recommended media. 
Reprint the defective image.
 Does the problem remain?
Go to step 2.Problem 
resolved
2Check the media transfer route.
 Is the media path free of contamination or debris?
Go to step 3.Remove debris 
or 
contamination.
3Check the four PC cartridges for proper installation.
Check the PC cartridge connections.
 Are the PC cartridge connections free of excess 
wear and contamination?
Go to step 4.Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
4Check the 2nd transfer roller for contamination and 
wear.
 Is the 2nd transfer roller free of excess wear and 
contamination?
Go to step 5.Replace the 2nd 
transfer roller.
Go to “2nd transfer roller removal” on page 4-24.
5Replace the transfer belt cleaner. Go to “Transfer belt cleaner removal” on page 4-175.
 Does the problem remain?
Go to step 6.Problem 
resolved
6Check the developer HVPS PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the developer HVPS PCBA.
Go to “Developer HVPS PCBA removal” on page 4-72.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Go to step 7.Problem 
resolved
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							2-244  Service Manual 5058-030  
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7Replace the four developer housings and four 
developer carriers. Go to “Developer housing (C) removal” on page 4-48, “Developer housing (K) removal” on page 4-54, “Developer housing (M) removal” on page 4-59, “Developer housing (Y) removal” on page 4-65,and “Developer carrier removal and replacement” on page 4-45.
 Does the problem remain?
Go to step 8.Problem 
resolved
8Check the transfer roll HVPS PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the transfer roll HVPS PCBA.
Go to “Transfer roll HVPS PCBA removal” on page 4-178.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Go to step 9.Problem 
resolved
9Check the LED printhead.
Replace the LED printhead.
Go to “LED printhead removal” on page 4-99.
 Does the problem remain?
Go to step 10.Problem 
resolved
10Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the upper printer engine PCBA. 
Go to “Upper printer engine PCBA removal” on page 4-184.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem 
resolved
Step Check Yes No 
						

							Diagnostic information 2-245
  5058-030
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Paper skew 
The printed image is partially rotated as a result of the media not being fed straight into the device. 
StepCheckYesNo
1Check printer installation placement.
Check the installation surface for irregularities. 
Check for damaged printer caster. 
 Is the setup surface normal?
Go to step 2.Correct the 
installation 
placement.
2Properly load media into the media tray assembly and 
ensure all guides are set correctly. 
Properly install the media tray assembly into the printer.
Reprint the defective image. 
 Does the problem remain?
Go to step 3.Problem 
resolved
3Check for obstructions in the area of the media feed 
units.
 Are the media feed unit assembly free from any 
obstructions?
Go to step 4.Remove 
obstructions.
4Is the printer left door assembly properly and 
evenly closed?Go to step 5.Open, and then 
properly close 
the printer left 
door assembly.
5Check the 2nd transfer roller for contamination and 
wear.
 Is the 2nd transfer roller free of excess wear and 
contamination?
Go to step 6.Replace the 2nd 
transfer roller.
Go to “2nd transfer roller removal” on page 4-24. 
						

							2-246  Service Manual 5058-030  
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Media damage  
6POR the machine. 
 Does the problem remain?
Replace the 
registration/ 
transport roller 
assembly.
Go to “Registration/transport roller assembly removal” on page 4-146.
Problem 
resolved
StepCheckYesNo
1Check printer installation placement.
Check the installation surface for irregularities. 
Check for missing printer foot. 
 Is the setup surface normal?
Go to step 2.Correct the 
installation 
placement.
2Check the media feed.
Remove the media tray assembly. 
Properly load media in the media tray assembly. 
Properly install the media tray assembly in the printer.
Reprint the defective image. 
 Does the problem remain?
Go to step 3.Problem 
resolved
3Check the printer media type settings. Ensure the 
settings match the media being used.
 Does the problem remain?
Go to step 4.Problem 
resolved
Step Check Yes No
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							Diagnostic information 2-247
  5058-030
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4Check the media condition. Ensure the recommended 
media is being used. 
Load new, dry, recommended media.
Reprint the defective image.
 Does the problem remain?
Go to step 5.Problem 
resolved
5Check the 2nd transfer roller for contamination and 
wear.
 Is the 2nd transfer roller free of excess wear and 
contamination?
Go to step 6.Replace the 2nd 
transfer roller.
Go to “2nd transfer roller removal” on page 4-24.
6Check the registration transport roller assembly.
 Are all drive rollers on the registration transport 
roller assembly free of contamination, wear and 
damage?
Go to step 7.Replace 
registration 
transport roller 
assembly.
Go to “Registration/transport roller assembly removal” on page 4-146.
7Check the heat belt and pressure roll in the fuser 
assembly for scratches or defects.
CAUTION: The fuser assembly might be 
hot. Allow the fuser assembly to cool. 
Remove the fuser assembly.
 Is there contamination or cracks on the heat belt 
and/or pressure roll?
Replace the 
fuser assembly.
Go to “Fuser assembly removal” on page 4-81.
Inspect the 
machine for 
obstructions in 
the media path.
Step Check Yes No 
						

							2-248  Service Manual 5058-030  
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No fuse  
StepCheckYesNo
1Check the printer media type settings. Ensure the 
settings match the media being used. 
 Does the problem remain?
Go to step 2.Problem 
resolved
2Check the fuser assembly installation.
Check that the thumbscrews, on both sides of the fuser, 
are properly tightened.
Reprint the defective image. 
 Does the problem remain?
Go to step 3.Problem 
resolved
3Check the media condition.
Load new, dry, recommended media.
Reprint the defective image.
 Does the problem remain?
Go to step 4.Problem 
resolved
4Check the heat belt and pressure roll in the fuser 
assembly for scratches or defects.
CAUTION: The fuser assembly might be 
hot. Allow the fuser assembly to cool. 
Remove the fuser assembly.
 Is there contamination or cracks on the heat belt 
and/or pressure roll?
Replace the 
fuser assembly.
Go to “Fuser assembly removal” on page 4-81.
Go to step 4.
5Check the connections on the fuser driver PCBA.
Replace the fuser driver PCBA.
Go to “Fuser driver PCBA removal” on page 4-87.
 Does the problem remain?
Go to step 5.Problem 
resolved
Leading edge
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							Diagnostic information 2-249
  5058-030
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Color misregistration
6Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
 Does the problem remain?
Replace the 
upper printer 
engine PCBA. 
Go to “Upper printer engine PCBA removal” on page 4-184. 
Problem 
resolved
StepCheckYesNo
1Replace the transfer belt assembly. Go to “Transfer belt assembly removal” on page 4-171.
 Does the error remain?
Go to step 2.Problem 
resolved
2Replace the printhead. Go to “LED printhead removal” on page 4-99.
 Does the error remain?
Go to step 3.Problem 
resolved
3Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the upper printer engine PCBA. 
Go to “Upper printer engine PCBA removal” on page 4-184.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem 
resolved
Step Check Yes No 
						

							2-250  Service Manual 5058-030  
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Deletions  
StepCheckYesNo
1Check the media condition.
Load new, dry, recommended media.
Reprint the defective image.
 Does the problem remain?
Go to step 2.Problem 
resolved
2Make sure the PC cartridges are properly installed.
 Does the problem remain?
Go to step 3.Problem 
resolved
3Check the 2nd transfer roller for contamination and 
wear.
 Is the 2nd transfer roller free of excess wear and 
contamination?
Go to step 4.Replace the 2nd 
transfer roller.
Go to “2nd transfer roller removal” on page 4-24.
4POR the machine. 
 Does the problem remain?
Replace the 
transfer belt 
assembly. Go to 
“Transfer belt assembly removal” on page 4-171.
Problem 
resolved.