Lexmark M410 Service Manual - Page 71

4045-XXX FRU 3 HVPS Action Check the following voltages at J9-7 on the engine board: Printer Idle J9-7 measures 0 V dc Printer Printing Test Page J9-7 voltage changes from 0 V dc to +4 V dc If the voltage does not vary, check the continuity of line J9-7 in the front cable harness. If there is no continuity, replace the cable harness. If there is continuity, replace the HVPS. If this does not correct the problem, replace the engine board. Turn the printer Off and check the resistance between J9-9 and printer ground. The resistance measures approximately 0 ohms. If incorrect, make sure the engine board is mounted correctly and securely grounded. If correct, replace the engine board. Print Quality - Residual Image Service Tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade and other parts inside the print cartridge. Diagnostic Information 2-45