• Code: U1 02
• Description: PANEL LOW battery error. The voltage of the panel clock function battery falls.
• Causes: The voltage of the panel clock function battery falls.
• Remedy: Check voltage of panel clock function battery. Replace the battery.

• Code: U2 04
• Description: EEPROM communication error
• Causes: EEPROM defect. ICU PWB EEPROM access circuit failure.
• Remedy: Check that the EEPROM is properly set. Clear trouble with SIM 16. Replace the MCU PWB.

• Code: U2 20
• Description: Machine speed code data error. The machine boot speed information is not identical to the model code speed information
• Causes: EEPROM defect. SIM operation error.
• Remedy: Check for matching of the machine and model information setting in SIM26-57.

• Code: U7 00
• Description: RIC communication trouble. Error in communication with RIC. Error in communication test after turning on the power or canceling SIM.
• Causes: Connector harness contact trouble or disconnection. RIC control PWB trouble. MCU PWB failure. Malfunction by noises.
• Remedy: Check the communication cable, connectors from the RIC box to the main body.

• Code: U9 00
• Description: Operation control PWB communication trouble. Communication trouble between MCU and the operation control PWB
• 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. Check ROM on the operation control PWB.

• Code: U9 80
• Description: Operation control PWB communication trouble (Protocol). Communication trouble between MCU and the operation control PWB (Protocol 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 81
• Description: Communication trouble between MCU and the operation control PWB (Parity 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 82
• Description: Communication trouble between MCU and the operation control PWB (Overrun 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.