Lexmark M410 - Optra B/W Laser Printer Service Manual page 71

4045-XXX
FRU
3 HVPS
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.
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.
Diagnostic Information
2-45