Lexmark Optra C710 Service Manual - Page 148

5016-001 Background Service Check Note: Some background problems can be caused by rough papers. Slick or coated papers may also cause background. Some problems occur with printers that run a large amount of graphics in a humid environment. • Try an ITM assembly. • Try a new toner cartridge of the background color. FRU 1 Erase Lamps 2 Printhead 3 High Voltage Contacts 4 Grid Block ASM 2 HVPS 5 Engine Board Action Go to the "Erase Lamp Service Check" on page 2-50. The printhead cannot be cleaned. If all other attempts at correcting a background problem fail, replace the printhead. Check the high voltage contacts in grid block 1 and 2 to ensure they are clean, not bent, deformed or pitted. If incorrect, replace the failing grid block assembly Be sure the HVPS is correctly installed and securely mounted to the HVPS mounting bracket and grid block assemblies. If correct, remove the HVPS and be sure the high voltage contacts align with the contacts on the HVPS. Also look for any signs of pitting or damage. If background problems continue: • Replace the HVPS. • If this does not fix the problem, replace grid assembly 1, and assembly 1. 2-82 Service Manual