Phaser 6180MFP Multifunction Printer Service Manual 3-117Error Messages and CodesMCU Firmware ErrorFirmware error has been detected. The following troubleshooting procedureapplies to this error.Applicable Chain Link■ Chain Link 024-340: MCU Firmware Error (IOT Firmware Error)Initial Actions■ Cycle printer power.■ If the problem persists, follow the procedure below.NoteIf the error occurred after replacing the MCU Board, transfer the internaldata from the old MCU Board to the new MCU Board.Troubleshooting Reference TableApplicable Parts Wiring and Plug/Jack Map References■ MCU Board, PL9.2.13 ■ “General Wiring Diagram” on page 10-23Troubleshooting Procedure TableStep Actions and Questions Yes No1 1. Turn the printer power Off and backOn.2. Does the error still occur?Go to step 2. Complete.2 1. Check the firmware version: System> Information Pages >Configuration.2. Does the firmware have thecorrect version?Go to step 3. Update thefirmware(“FirmwareUpdate” onpage A-3).3 1. Reseat the MCU Board (page 8-88).2. Does the error still occur?Go to step 4. Complete.4 1. Replace the MCU Board(page 8-88).2. Does the error still occur when theprinter is turned On?Refer to“ElectricalNoise” onpage 4-108,Troubleshootingchapter.Complete.