• Code: C4001
• Description: Polygon motor synchronization error The ready signal is not at the L level after passing 15s since the polygon motor drive was started.
• Remedy: 1 Checking the connection FFC is not connected properly. Or it is faulty. Clean the FFC terminals of the following FFC and reconnect them. If the FFC terminal is deformed or broken, replace the FFC. . LSU (APC PWB) - Engine PWB Section 8 "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. Detaching and reattaching the LSU 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Update 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4011
• Description: Polygon motor steady-state error The ready signal is at the H level for 15s continuously after the polygon motor drive becomes stable.
• Remedy: 1 Checking the connection FFC is not connected properly. Or it is faulty. Clean the FFC terminals of the following FFC and reconnect them. If the FFC terminal is deformed or broken, replace the FFC. . LSU (APC PWB) - Engine PWB Section 8 "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. Detaching and reattaching the LSU 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Update 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4101
• Description: BD initialization error The BD signal was not detected for 1s after driving the polygon motor.
• Remedy: 1 Checking the connection FFC is not connected properly. Or it is faulty. Clean the FFC terminals of the following FFC and reconnect them. If the FFC terminal is deformed or broken, replace the FFC. . LSU (APC PWB) - Engine PWB Section 8 "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. Detaching and reattaching the LSU 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Update 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4201
• Description: BD steady-state error The BD signal is not detected during the laser lighting.
• Remedy: 1 Checking the connection FFC is not connected properly. Or it is faulty. Clean the FFC terminals of the following FFC and reconnect them. If the FFC terminal is deformed or broken, replace the FFC. . LSU (APC PWB) - Engine PWB Section 8 "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. Detaching and reattaching the LSU 3 Firmware upgrade The engine firmware is faulty. Upgrade the engine firmware to the latest version Firmware Update 4 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4600
• Description: LSU cleaning motor error 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/ Maintenanc e Menu (Operation Guide - Section 10) 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. Detaching and reattaching the LSU 4 Checking the connection The connector or FFC is not connected properly. Or, the wire or FFC is faulty. Clean the following wire connector terminal and FFC terminal, then reconnect the connector and the FFC. If the wire or FFC is faulty, replace them. . LSU cleaning motor - APC PWB (LSU) . APC PWB (LSU) - Engine PWB Section 8 "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. If not repaired, replace it. 6 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 7 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4701
• Description: VIDEO ASIC device error 1 Communication with VIDEO ASIC has fails 10 times continuously. (After writing to VIDEO ASIC, read from same address and the error occurred that the value does not match)
• 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 Update 3 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4702
• Description: VIDEO ASIC device error 2 Communication with VIDEO ASIC (2) has fails 10 times continuously. (After writing to VIDEO ASIC, read from same address and the error occurred that the value does not match)
• 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 Update 3 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB

• Code: C4801
• Description: LSU type mismatch error The LSU mismatches with the main unit.
• Remedy: 1 Checking the LSU The different type LSU is installed. Install the correct LSU. Detaching and reattaching the LSU 2 Checking the connection FFC is not connected properly. Or it is faulty. Clean the FFC terminals of the following FFC and reconnect them. If the FFC terminal is deformed or broken, replace the FFC. . LSU (APC PWB) - Engine PWB Section 8 "PWBs" 3 LSU replacement The APC PWB is faulty. Replace the LSU. Detaching and reattaching the LSU