• Code: C4702
• Description: VIDEO ASIC device error 2 Object: 35ppm or faster color models
• Causes: The communication with VIDEO ASIC (2) 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

• Code: C4801
• Description: LSU type mismatch error
• Causes: The LSU mismatches with the main unit.
• Remedy: 1 Checking the LSU The different type LSU is installed. Install the correct LSU. LSU Replacement 2 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 3 LSU replacement The APC PWB is faulty. Replace the LSU. LSU Replacement

• Code: C5101
• Description: Main high-voltage error BK Object: 35ppm or faster color models and the monochrome models
• Causes: 1. When measuring the inflow electric currents changing Vpp to 3 steps during the Vpp adjustment, the gap between the 0 electric current value and the 2nd electric current value is at the reference value or less.2. The detected ldc is poor even if applying Vpp[C]. (5ìA or less)
• Remedy: 1 Reinstalling the main highvoltage PWB The main charger roller contacts of the main highvoltage PWB are not properly contacted, and so, the proper voltage is not applied. Reinstall the main high-voltage PWB. Main Highvoltage PWB Replacement 2 Checking the drum unit and the developer unit The drum or the drum screw is not rotated properly due to the excessive load. Check if the drum or the drum screw is rotated manually, and replace the drum unit if not rotated. Drum Unit Replacement 3 Replacing drum motor BK Drum motor BK is faulty. Replace drum motor BK. Main Drive Unit Replacement 4 Checking the main charger unit The proper voltage is not applied since the foreign objects adhered on the high-voltage contact of the main charger unit. Clean the high-voltage contact of the main charger unit, and apply conductive grease to the roller shaft. Main Charger Unit Replacement 5 Main charger unit replacement The proper voltage is not applied since the high-voltage contact of the main charger unit is deformed or damaged. Replace the main charger unit and execute U930. Main Charger Unit Replacement 6 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Main high-voltage PWB - Engine PWB Electrical Diagram of PWBs 7 Replacing the main highvoltage PWB The main high-voltage PWB is faulty. Replace the main high-voltage PWB. Main Highvoltage PWB Replacement 8 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 9 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C5102
• Description: Main high-voltage error C Object: 35ppm or faster color models
• Causes: When measuring the inflow electric current changing Vpp to 3 steps during the Vpp adjustment, the gap between the 0 electric current value and the 2nd electric current value is the standard value or less.
• Remedy: 1 Reinstalling the main highvoltage PWB The main charger roller contacts of the main highvoltage PWB are not properly contacted, and so, the proper voltage is not applied. Reinstall the main high-voltage PWB. Main Highvoltage PWB Replacement 2 Checking the drum unit and the developer unit The drum or the drum screw is not rotated properly due to the excessive load. Check if the drum or the drum screw is rotated manually, and replace the drum unit if not rotated. Drum Unit Replacement 3 Checking drum motor COL Drum motor COL is not rotated properly due to an excessive load. Replace drum motor COL. Main Drive Unit Replacement 4 Checking the main charger unit The proper voltage is not applied since the foreign objects adhered on the high-voltage contact of the main charger unit. Clean the high-voltage contact of the main charger unit, and apply conductive grease to the roller shaft. Main Charger Unit Replacement 5 Main charger unit replacement The proper voltage is not applied since the high-voltage contact of the main charger unit is deformed or damaged. Replace the main charger unit and execute U930. Main Charger Unit Replacement 6 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Main high-voltage PWB - Engine PWB Electrical Diagram of PWBs 7 Replacing the main highvoltage PWB The main high-voltage PWB is faulty. Replace the main high-voltage PWB. Main Highvoltage PWB Replacement 8 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 9 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C5103
• Description: Main high-voltage error M Object: 35ppm or faster color models
• Causes: When measuring the inflow electric current changing Vpp to 3 steps during the Vpp adjustment, the gap between the 0 electric current value and the 2nd electric current value is the standard value or less.
• Remedy: 1 Reinstalling the main highvoltage PWB The main charger roller contacts of the main highvoltage PWB are not properly contacted, and so, the proper voltage is not applied. Reinstall the main high-voltage PWB. Main Highvoltage PWB Replacement 2 Checking the drum unit and the developer unit The drum or the drum screw is not rotated properly due to the excessive load. Check if the drum or the drum screw is rotated manually, and replace the drum unit if not rotated. Drum Unit Replacement 3 Checking drum motor COL Drum motor COL is not rotated properly due to an excessive load. Replace drum motor COL. Main Drive Unit Replacement 4 Checking the main charger unit The proper voltage is not applied since the foreign objects adhered on the high-voltage contact of the main charger unit. Clean the high-voltage contact of the main charger unit, and apply conductive grease to the roller shaft. Main Charger Unit Replacement 5 Main charger unit replacement The proper voltage is not applied since the high-voltage contact of the main charger unit is deformed or damaged. Replace the main charger unit and execute U930. Main Charger Unit Replacement 6 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Main high-voltage PWB - Engine PWB Electrical Diagram of PWBs 7 Replacing the main highvoltage PWB The main high-voltage PWB is faulty. Replace the main high-voltage PWB. Main Highvoltage PWB Replacement 8 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 9 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C5104
• Description: Main high-voltage error Y Object: 35ppm or faster color models
• Causes: When measuring the inflow electric current changing Vpp to 3 steps during the Vpp adjustment, the gap between the 0 electric current value and the 2nd electric current value is the standard value or less.
• Remedy: 1 Reinstalling the main highvoltage PWB The main charger roller contacts of the main highvoltage PWB are not properly contacted, and so, the proper voltage is not applied. Reinstall the main high-voltage PWB. Main Highvoltage PWB Replacement 2 Checking the drum unit and the developer unit The drum or the drum screw is not rotated properly due to the excessive load. Check if the drum or the drum screw is rotated manually, and replace the drum unit if not rotated. Drum Unit Replacement 3 Checking drum motor COL Drum motor COL is not rotated properly due to an excessive load. Replace drum motor COL. Main Drive Unit Replacement 4 Checking the main charger unit The proper voltage is not applied since the foreign objects adhered on the high-voltage contact of the main charger unit. Clean the high-voltage contact of the main charger unit, and apply conductive grease to the roller shaft. Main Charger Unit Replacement 5 Main charger unit replacement The proper voltage is not applied since the high-voltage contact of the main charger unit is deformed or damaged. Replace the main charger unit and execute U930. Main Charger Unit Replacement 6 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Main high-voltage PWB - Engine PWB Electrical Diagram of PWBs 7 Replacing the main highvoltage PWB The main high-voltage PWB is faulty. Replace the main high-voltage PWB. Main Highvoltage PWB Replacement 8 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 9 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C5130
• Description: Primary transfer high-voltage error Object: Monochrome models
• Causes: When adjusting the feedback, the detected electric current value exceeds the upper limit or is less than the lower limit, or the adjustment result is 300V or less or is 2,900V or more.
• Remedy: 1 Reinstalling the primary transfer unit The primary transfer unit is not properly installed. Reinstall the primary transfer unit so that the connector firmly connects. Primary Transfer Unit Replacement 2 Checking the high-voltage contact Foreign material adheres on the high-voltage contacts of the primary transfer roller, and so, the proper voltage is not applied. Clean the high-voltage contact of the primary transfer roller, and apply conductive grease to the roller shaft. 3 Reinstalling the transfer high-voltage PWB The high-voltage contacts on the transfer high-voltage PWB are faulty, and so, the proper voltage is not applied. Reinstall the transfer highvoltage PWB. Transfer High-voltage PWB Replacement 4 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires if there is no continuity.• Transfer high-voltage PWB - Engine PWB• Transfer highvoltage PWB - Feed image PWB Electrical Diagram of PWBs 5 Replacing the transfer high-voltage PWB The transfer high-voltage PWB is faulty. Replace the transfer highvoltage PWB. Transfer High-voltage PWB Replacement 6 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 8 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement

• Code: C5131
• Description: Primary transfer high-voltage error K Object: Color models
• Causes: When adjusting the feedback, the detected electric current value exceeds the upper limit or is less than the lower limit, or the adjustment result is 300V or less or is 2,900V or more.
• Remedy: 1 Checking the developer BK/belt motor The developer BK/belt motor is faulty. Execute U030 [DLP(K)] to check the developer BK/belt motor operation.If it does not properly operate, reattach the developer BK/belt motor and reconnect the connector. When it is not fixed, replace the motor. U030 Execution 2 Reinstalling the primary transfer unit The primary transfer unit is not properly installed. Reinstall the primary transfer unit so that the high-voltage contacts of the primary transfer roller firmly connect. Primary Transfer Unit Replacement 3 Primary transfer unit replacement The primary transfer belt does not properly rotate. Replace the primary transfer unit when the primary transfer belt does not rotate manually. Primary Transfer Unit Replacement 4 Checking the high-voltage contact Foreign material adheres on the high-voltage contacts of the primary transfer roller, and so, the proper voltage is not applied. Clean the high-voltage contact of the primary transfer roller, and apply conductive grease to the roller shaft. 5 Reinstalling the transfer high-voltage PWB The high-voltage contacts on the transfer high-voltage PWB are faulty, and so, the proper voltage is not applied. Reinstall the transfer highvoltage PWB. Transfer High-voltage PWB Replacement 6 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wires if there is no continuity.• Transfer high-voltage PWB - Engine PWB• Transfer highvoltage PWB - Feed image PWB Electrical Diagram of PWBs 7 Replacing the transfer high-voltage PWB The transfer high-voltage PWB is faulty. Replace the transfer highvoltage PWB. Transfer High-voltage PWB Replacement 8 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 9 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 10 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacement