• Code: C3600
• Description: Scanner sequence error
• Causes: The program internal processing error of the scanner sequence occurs.
• Remedy: 1 Executing U021 The memory operation is faulty. Execute U021. U021 Execution 2 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C3800
• Description: AFE error
• Causes: The writing data and the reading data mismatch 3 times continuously when writing.The response from AFE is not returned for 100ms.
• Remedy: 1 Checking the FFC The FFC is not properly connected, or it is faulty. Reconnect the following FFC. When the FFC terminals are peeled off or deformed or the FFC is broken, replace the FFC.• CCD PWB - Engine PWB Electrical Diagram of PWBs 2 Replacing the ISU The CCD PWB is faulty. Replace the ISU and then execute U411. ISU Replacement 3 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4001
• Description: Polygon motor synchronization error
• Causes: The ready signal is not at the L level after passing 15s since the polygon motor drive was started.
• Remedy: 1 Checking the wire and the FFC The wire or the FFC is not properly connected, or they are faulty. Reinsert the following wire connectors and reconnect the FFC. Replace the wire If there is no continuity. Then, replace the FFC if the FFC terminals are deformed or the FFC is broken.• LSU cleaning motor - APC PWB (LSU)• APC PWB (LSU) - Engine PWB Electrical Diagram of PWBs 2 Checking the polygon motor The polygon motor does not rotate properly. Check the rotation sound of the polygon motor, and reattach or replace the LSU if it does not rotate properly. LSU Replacement 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Upgrade 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4011
• Description: Polygon motor steady-state error
• Causes: The ready signal is at the H level for 15s continuously after the polygon motor drive becomes stable.
• Remedy: 1 Checking the wire and the FFC The wire or the FFC is not properly connected, or they are faulty. Reinsert the following wire connectors and reconnect the FFC. Replace the wire If there is no continuity. Then, replace the FFC if the FFC terminals are deformed or the FFC is broken.• LSU cleaning motor - APC PWB (LSU)• APC PWB (LSU) - Engine PWB Electrical Diagram of PWBs 2 Checking the polygon motor The polygon motor does not rotate properly. Check the rotation sound of the polygon motor, and reattach or replace the LSU if it does not rotate properly. LSU Replacement 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Upgrade 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4101
• Description: BD initialization error
• Causes: The BD signal was not detected for 1s after driving the polygon motor.
• Remedy: 1 Checking the FFC The FFC is not properly connected, or it is faulty. Reconnect the following FFC. When the FFC terminals are peeled off or deformed or the FFC is broken, replace the FFC.• APC PWB (LSU) - Engine PWB Electrical Diagram of PWBs 2 Checking the LSU The BD sensor or the laser diode is faulty. Reinstall or replace the LSU while paying attention to the static electricity. LSU Replacement 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Upgrade 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4201
• Description: BD steady-state error
• Causes: The BD signal is not detected during the laser lighting.
• Remedy: 1 Checking the FFC The FFC is not properly connected, or it is faulty. Reconnect the following FFC. When the FFC terminals are peeled off or deformed or the FFC is broken, replace the FFC.• APC PWB (LSU) - Engine PWB Electrical Diagram of PWBs 2 Checking the LSU The BD sensor or the laser diode is faulty. Reinstall or replace the LSU while paying attention to the static electricity. LSU Replacement 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Upgrade 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4600
• Description: LSU cleaning motor error
• Causes: The LSU cleaning motor lock-up was detected, or the motor continued to be shifted in the same direction for 8s or more.
• Remedy: 1 Executing the Laser Scanner Cleaning The LSU cleaning drive gear and the cleaning pad have the load and so they are not shifted smoothly. Execute Laser Scanner Cleaning. Adjustment/ Maintenance Menu 2 Cleaning the LSU cleaning drive gear and the cleaning pad The LSU cleaning drive gear and the cleaning pad have the load and so they are not shifted smoothly. Clean the LSU cleaning drive gear and the cleaning pad. 3 LSU replacement The LSU cleaning drive gear, cleaning wire or the cleaning pad are deformed, or they are faulty. Replace the LSU. LSU Replacement 4 Checking the wire and the FFC The wire or the FFC is not properly connected, or they are faulty. Reinsert the following wire connectors and reconnect the FFC. Replace the wire If there is no continuity. Then, replace the FFC if the FFC terminals are deformed or the FFC is broken.• LSU cleaning motor - APC PWB (LSU)• APC PWB (LSU) - Engine PWB Electrical Diagram of PWBs 5 Checking the LSU cleaning motor The LSU cleaning motor is not properly attached, or it is faulty. Reattach the LSU cleaning motor and reconnect the connector. Then, replace it if it is not fixed. 6 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 7 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C4701
• Description: VIDEO ASIC device error 1
• Causes: The communication with VIDEO ASIC failed 10 times continuously.(This is the value mismatching error by trying to read the data from the same address after writing the data to VIDEO ASIC.)
• Remedy: 1 Resetting the main power The ASIC operation on the engine is faulty. Turn the power switch and the main power switch off . After 5s passes, turn the main power switch and the power switch on. 2 Firmware upgrade The firmware is not the latest version. Upgrade the main firmware and the engine firmware to the latest version. Firmware Upgrade 3 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement