Lexmark C 950 Service Manual

							Diagnostic information 2-231
  5058-030
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4Check the toner dispense motor assembly for proper 
operation.
Replace the toner dispense motor.
Go to “Toner dispense motor removal” on 
page 4-166.
 
Does the problem remain?Go to step 5. Problem 
resolved
5Check the LED printhead assembly installation. 
Install the LED printhead assembly properly, and 
perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Go to step 6. Problem 
resolved
6Check the LED printhead assembly for connection.
 
Is the above component properly connected?Go to step 7. Replace the 
connection.
7Check 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 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
9Replace the LED printhead assembly.
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 
						

							2-232  Service Manual 5058-030  
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Solid black 
Check the media path for foreign objects such as staples, clips, scraps of media. 
Step Check Yes No
1Check 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 2. Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
2Check the charge roll HVPS PCBA connections.
 
Is the above component properly connected?Go to step 3 Replace the 
connection.
3Replace the charge roll HVPS PCBA. Go to “Charge 
roll HVPS PCBA removal” on page 4-39.
Perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Go to step 4. Problem 
resolved
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 
						

							Diagnostic information 2-233
  5058-030
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Vertical lines and bands (process direction)
StepCheckYesNo
1Check the media condition.
Load new, dry, recommended media. 
Reprint the defective image.
 Does the problem remain?
Go to step 2.Problem resolved
2Is the media transfer route and the media path clear of 
debris?Go to step 3.Remove debris or 
contamination.
3Check the LED beam route.
Check for debris between the LED printhead assembly and 
the PC drum.
Check the four LED printhead assembly windows for 
contamination.
 Is the LED beam route free of debris and the glass 
window, in the LED printhead assembly, free of 
contamination?
Go to step 4.Remove debris or 
clean the LED 
printhead 
assembly window.
4Check 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 5.Correct and clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
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 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.
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							2-234  Service Manual 5058-030  
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Horizontal white stripes or bands (side-to-side direction)   
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 assembly.
Replace the LED printhead assembly.
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?
Go to step 10.Problem resolved
10Check the RIP card PCBA for connection.
 Is the component properly connected?
Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
Replace the 
connection.
StepCheckYesNo
1Check the media condition.
Load new, dry, and recommended media.
Reprint the defective image.
 Does the problem remain?
Go to step 2.Problem resolved
Step Check Yes No
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							Diagnostic information 2-235
  5058-030
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2Are the media transfer route and the media path free of 
contamination and debris?Go to step 3.Remove debris or 
contamination.
3Check the PC units for proper connection. 
 Does the problem remain?
Go to step 4Problem resolved
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 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 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
7Check 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 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 RIP card PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
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 
						

							2-236  Service Manual 5058-030  
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Vertical stripes  (process direction)
StepCheckYesNo
1Check the media condition.
Load new, dry, recommended media. 
Reprint the defective image.
 Does the problem remain?
Go to step 2.Problem 
resolved
2Are the media transfer route and the media path free 
of contamination or debris?Go to step 3.Remove debris 
or 
contamination.
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.
4Check 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 5.Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
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 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 7.
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							Diagnostic information 2-237
  5058-030
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Horizontal stripes  (side to side direction)
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 RIP card for proper connectivity.
Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the problem remain?
Problem solved.Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
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.
Check the media route for contamination or obstacles.
Go to step 3.Remove 
obstacles 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.
Step Check Yes No
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							2-238  Service Manual 5058-030  
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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 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.
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 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 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 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 2-239
  5058-030
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Partial lack  
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 four toner cartridges for proper installation.
Reprint the defective image.
 Is the image density normal?
Problem solved.Replace any 
empty toner 
cartridges.
3Check the LED beam route.
Check for debris between the LED printhead assembly 
and the PC drum.
Check the four LED printhead assembly windows for 
contamination.
 Is the LED beam route free of debris and the glass 
window, in the LED printhead assembly, free of 
contamination?
Go to step 4. Remove debris 
or clean the LED 
printhead 
assembly 
window.
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
6Replace the transfer belt assembly. Go to “Transfer belt assembly removal” on page 4-171.
 Does the problem remain?
Go to step 7.Problem 
resolved
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							2-240  Service Manual 5058-030  
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Spots  
7Check the LED printhead assembly for proper 
installation. 
Install the LED printhead assembly properly, and 
perform a print test. Go to “PRINT TESTS” on page 3-22.
 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?
Problem solved.Replace the RIP 
PCBA.
Go to “RIP PCBA removal” on page 4-147.
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 route free of contamination or debris?
Go to step 3.Remove debris 
or 
contamination.
Step Check Yes No
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