Lexmark Optra C710 Service Manual - Page 146

5016-001 All Black or Color Page Service Check Note: An all black or a page that is all one color is generally caused by a problem in the high voltage system, or incorrect high voltage in the printing process resulting in the development of toner on the entire PC drum. FRU 1 Print Cartridge 2 High Voltage Contacts Grid Block 1 Grid Block 2 HVPS 3 HVPS to Engine Board Cable 4 Engine Board Printhead Cable Engine Board 5 Printhead Action Try a new print cartridge corresponding to the color on the page. 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 check to be sure the high voltage contacts align with the contacts on the HVPS. Also look for signs of pitting or damage. Check the cable for correct installation and continuity. If incorrect, replace the cable. Check the cable for proper installation and continuity. • If the continuity is incorrect, replace the cable. • If incorrect, replace the engine board. The printhead can cause this problem, but should only be replaced after a new toner cartridge(s) or ITM has been replaced. 2-80 Service Manual