Error Messages and Codes 3-107Inverter Unit Interface FailureA communication error has occurred in the Finisher Inverter.Applicable Status Code:Code U51: Inverter Unit Interface Failure.Initial Actions:■ Reseat the Finisher connections.■ Cycle the printer's power.■ If the problem persists follow the procedure below.Troubleshooting Reference TableApplicable Parts Wiring and Plug/Jack References■ Inverter Control Board■ Engine Control Board, PL1.1.4■ Print Engine Map 3 (page 10-6)■ Print Engine Motor Driver Board (6/6) (page 10-36)■ Options Map 3 Inverter Controller BoardTroubleshooting Procedure TableStep Actions and Questions Yes No1 Check the following for evidence of fault ordamage:■ Inverter Interface Cable■ Inverter connectionsIs there any damage?Replace anydamaged parts.Go to Step 2.2 Check the Inverter connection.Is the Inverter interface cable securelyconnected at both ends?Go to Step 3. Connect theInverter to theFinisher.3 Check all pins on the OPTIF Harness forcontinuity.Disconnect OPTIF from the Engine ControlBoard and Option connector.Is the harness conductive?Replace the InverterControl Board. If theerror persists,replace the EngineControl Board(page 8-112).Replace theOPTIF Harness.
