Lexmark C750 Service Manual - Page 174

5060-00x Entire page is mostly one color-Full bleed planes in one color Some printing may appear in other colors. This applies to black, cyan, magenta and yellow. Step 1 Action and questions Using a piece of paper, block the laser path between the printhead and cartridge for the color that is experiencing the full bleed issue. Turn the printer off. Check the cable connections between the printhead and the system board. Do you continue to have the same problem? 3 Use the "Printhead diagnostics" on page 3-1 and the "Card assembly, printhead diagnostic aid" on page 7-15 to switch video cables between the printhead of the full bleed color and another color. Does the color of the full bleed plane stay the same? 4 Change or switch the cartridge of the color that is experiencing the issue. Do you continue to have the same problem? 5 Cartridge contact assembly - Check the cartridge contact block. Make sure the PC drum contact pin is not stuck. See "Cartridge contact assembly pin locations" on page 5-4 to identify the PC drum contact pin. Does the pin operate correctly? 6 Turn the printer off. Check the cable connections between the developer HVPS board and the system board. Do you continue to have the same problem? 7 Perform a continuity check on the developer HVPS cable. Do you have continuity? Replace the FRUs in the following order: 1. "Developer HVPS board removal" on page 4-28. 2. "Engine board removal" on page 4-29. Replace the developer HVPS cable. Go to step 7 Go to step 6 Replace the cartridge contact assembly. See "Cartridge contact assembly removal" on page 4-23. Problem resolved Replace the printhead (see "Printhead removal and adjustment" on page 4-50.) Go to step 5 Replace the system board. See "System board" on page 4-80. Yes Go to step 2 No Go to step 4 2 Go to step 3 Problem solved Replace the cartridge. 2-140 Service Manual