Lexmark T430 Service Manual - Page 86

4048-1xx Heavy background Poor development or poorly charged toner particles cause excessive background. This is more noticeable as the print cartridge nears end of life. FRU Print cartridge (not a FRU) HVPS card Controller card assembly Cartridge contacts assembly Action Make sure the print cartridge is correctly installed and the high voltage contacts are clean. If the cartridge is installed correctly and the problem persists, try a new cartridge. The cartridge may be nearing end-of-life. Check the cartridge contacts for correct installation and contamination where contact is made with the print cartridge and HVPS card. Clean as necessary. If this does not correct the problem, replace the HVPS. If that does not correct the problem, replace the controller card assembly. Note: Always check printhead alignment after replacing the controller card assembly. See "Printhead assembly adjustment" on page 4-2 for hardware alignment of the printhead. Partial blank image/white spots (no periodic pattern) FRU Print cartridge (not a FRU) Fuser assembly Paper (not a FRU) Action Remove the print cartridge and gently shake the assembly to evenly distribute the toner. If the print cartridge is low, try a new one. Check springs at each end of the fuser backup roller to ensure adequate and even pressure is applied to the fuser belt. Replace the fuser if necessary. Make sure recommended paper is being used. 2-52 Service Manual