• Code: U2 90
• Description: EEPROM read/write error (PCU)
• Causes: EEPROM version error EEPROM write error
• Remedy: Case 1 Cause EEPROM trouble, Insertion of EEPROM which is not initialized or defective. Check & Remedy 1. Check that the EEPROM is properly inserted. 2. Use SIM 16 to cancel the error. Case 2 Cause PCU PWB EEPROM access circuit trouble Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the PCU PWB. 3. Use SIM 16 to cancel the error.

• Code: U2 91
• Description: Adjustment value check sum error (PCU)
• Causes: EEPROM (PCU) check sum error
• Remedy: Case 1 Cause EEPROM trouble Check & Remedy 1. Check that the EEPROM is properly inserted. 2. Use SIM 16 to cancel the error. Case 2 Cause Control circuit freeze caused by noises, PCU PWB EEPROM access circuit trouble Check & Remedy 1. To prevent against deletion of the counter data and the adjustment data, record them with the simulation. (When a printer option is installed, use SIM 22-1 to record the counter data and the adjustment data.) 2. Replace the PCU PWB. 3. Use SIM 16 to cancel the error.

• Code: U4 02
• Description: ADU alignment plate operation abnormality
• Causes: The alignment plate does not move from the home position within 1sec when it must move. Return to the home position is not detected for 5sec or more.
• Remedy: Case 1 Cause Home position sensor trouble Check & Remedy Use SIM 9-2 to detect the home position sensor. Case 2 Cause Alignment plate shift motor trouble Check & Remedy Use SIM 9-4 to check the alignment plate operation. Case 3 Cause Disconnection of the harness between the ADU control PWB and the motor sensor. Check & Remedy Check connection of the harness between the ADU control PWB and the motor sensor. Case 4 Cause Alignment plate operation belt, gear breakage or improper adjustment Check & Remedy Remove the ADU, and check for breakage of the gear and the belt.

• Code: U5 00
• Description: ADF communication trouble
• Causes: Communication test error when turning on the power or after canceling the exclusive simulation. Communication error with the ADF
• Remedy: Case 1 Cause Improper connection or disconnection of the connector and the harness Check & Remedy Check the connector and the harness in the communication line. Turn OFF/ON the power to cancel the error. Case 2 Cause ADF control PWB trouble, control PWB (MFP) trouble, malfunction caused by noises Check & Remedy Check the ADF control PWB and the control PWB (MFP). Turn OFF/ON the power to cancel the error.

• Code: U5 01
• Description: ADF resist sensor trouble
• Causes: ADF resist sensor detection trouble
• Remedy: Case 1 Cause Sensor trouble Check & Remedy Use SIM 2-2 to check the resist sensor detection. Case 2 Cause Disconnection of the harness in the ADF. Check & Remedy Check the harness in the ADF. Case 3 Cause ADF control PWB trouble Check & Remedy Replace the ADF control PWB.

• Code: U5 02
• Description: ADF repulsion sensor trouble
• Causes: ADF paper feed/reverse sensor detection trouble
• Remedy: Case 1 Cause Sensor trouble Check & Remedy Use SIM 2-2 to check the resist sensor detection. Case 2 Cause Disconnection of the harness in the ADF. Check & Remedy Check the harness in the ADF. Case 3 Cause ADF control PWB trouble Check & Remedy Replace the ADF control PWB.

• Code: U5 03
• Description: ADF timing sensor trouble
• Causes: ADF timing sensor detection trouble
• Remedy: Case 1 Cause Sensor trouble Check & Remedy Use SIM 2-2 to check the resist sensor detection. Case 2 Cause Disconnection of the harness in the ADF. Check & Remedy Check the harness in the ADF. Case 3 Cause ADF control PWB trouble Check & Remedy Replace the ADF control PWB.

• Code: U5 11
• Description: Paper feed motor operation abnormality
• Causes: Paper feed motor operation abnormality
• Remedy: Case 1 Cause Motor lock, motor RPM abnormality, Over current to the motor, ADF control PWB trouble Check & Remedy Use SIM 2-2/3/4 to check the paper feed motor operation.