Lexmark MS312
Turn off the printer.
Unplug the power cord from the electrical outlet.
Remove the extra trays.
Connect the power cord to a properly grounded electrical outlet.
Turn the printer back on.
Lexmark MS310, MS410, MS510, MS610, & MS611 ? Tips for Moving Printers with Installed Paper Tray Options
Colors Are Too Dark or Black Shading Is Covering Partial or Entire Page on the Lexmark CS310, CS410, CS510, CX310, CX410, or CX510