Lexmark C 950 Service Manual
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Diagnostic information 2-241 5058-030 Go Back Previous Next 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 Go Back Previous Next 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 Go Back Previous Next 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 Leading edge Trailing edge
2-244 Service Manual 5058-030 Go Back Previous Next 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 Go Back Previous Next 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 Go Back Previous Next 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 Leading edge Trailing edge
Diagnostic information 2-247 5058-030 Go Back Previous Next 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 Go Back Previous Next 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 Trailing edge
Diagnostic information 2-249 5058-030 Go Back Previous Next 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 Go Back Previous Next 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.