• Code: U9 84
• Description: Communication trouble between MCU and the operation control PWB (Framing error)
• Causes: Operation control PWB connector disconnection. Harness failure of the operation control PWB and the MCU PWB.
• Remedy: Check the connectors and the harness of the operation control PWB and MCU PWB. Check the grounding of the copier.

• Code: U9 88
• Description: Communication trouble between MCU and the operation PWB (Time-out error)
• Causes: Operation control PWB connector disconnection. Harness failure of the operation control PWB and the MCU PWB.
• Remedy: Check the connectors and the harness of the operation control PWB and MCU PWB. Check the grounding of the copier.

• Code: U9 99
• Description: Operation panel destination error. An error occurred in checking the destination of the operation panel and the main body.
• Causes: Erroneous connection the operation panel unit. SIM setup error.
• Remedy: Check the destination information of the operation panel unit and the MCU. (Sim26-6/22)