• Code: 091-440
• Description: Drum Cartridge Pre Near End Preparation for replacing the Drum Cartridge is required.
• Remedy: The Drum Cartridge needs to be replaced soon. Prepare a new Drum Cartridge. Replace the Drum Cartridge as required. (PL 8.1)

• Code: 091-441
• Description: Drum Cartridge Near End The Drum Cartridge needs to be replaced soon.
• Remedy: The Drum Cartridge needs to be replaced soon. Replace the Drum Cartridge as required. (PL 8.1)

• Code: 091-914
• Description: Drum CRUM Communication Fail Communication failure with Drum CRUM was detected. The CRUM ASIC has malfunctioned.
• Remedy: 1. Turn the power OFF and ON. 2. Turn OFF the power. Disconnect and reconnect the Drum Cartridge. NOTE: If turning the power OFF and ON or removing and reinstalling the Drum Cartridge resolves the problem, it is highly probable that the ESS/MCU PWB had misdetected due to external noise abnormal or noise caused by electrical discharge in the machine. Check for any noise source around the machine and check for any abnormal electrical discharge, etc. 3. Turn OFF the power and check the following: • The Drum CRUM PWB and Drum Cartridge CRUM connection terminals in the Drum Cartridge for poor contact. • The connection between the Drum Cartridge J615 and the Drum CRUM PWB JA for open circuit, short circuit, and poor contact. • The connection between the ESS/MCU PWB J426 and the Drum Cartridge P615 for open circuit, short circuit, and poor contact. 4. If no problem is found, replace the following parts in sequence: • Drum Cartridge (PL 8.1) • ESS/MCU PWB (PL 18.1)

• Code: 091-915, 091-916
• Description: Drum CRUM ID Error/ Drum CRUM Market Identity Mismatch [Drum CRUM ID Error] The Drum CRUM ID error was detected. [Drum CRUM Market Identity Mismatch] The Drum CRUM region mismatch was detected.
• Remedy: Replace it with the correct Drum Cartridge. (PL 8.1)

• Code: 092-660, 092-668
• Description: ATC Amplitude Fail/ ATC Average Fail [ATC Amplitude Fail] The output amplitude of the ATC Sensor in the ATC (Automatic Toner Control) measurement is small. [ATC Average Fail] The average output value is not within the specified range in the ATC (Automatic Toner Control) measurement.
• Remedy: 1. Install a Toner Cartridge that contains Toner. Copy a Test Chart (499T 00247), etc. and check whether the density has recovered. 2. Check the Toner Dispense Motor (Output Check [092-001]) for operation failure. (PL 8.2) 3. Check the Toner transport path for Toner blockage. 4. Check the connection between the ATC Sensor (Drum Cartridge) P615 and the ESS/ MCU PWB J409 for open circuit, short circuit, and poor contact. 5. If no problem is found, replace the following parts in sequence: • Drum Cartridge (PL 8.1) • ESS/MCU PWB (PL 18.1)

• Code: 092-661
• Description: Temperature Sensor Fail The output value of the Temperature Sensor is not within the specification range.
• Remedy: 1. Turn the power OFF and ON. 2. Check the connection between the HVPS J500-1 and the ESS/MCU PWB J402-14 for open circuit, short circuit, and poor contact. 3. If no problem is found, replace the following parts in sequence: • HVPS (PL 18.1) • ESS/MCU PWB (PL 18.1)

• Code: 092-910
• Description: ATC Sensor Fail The frequency at which the ATC Average Fail or the ATC Amplitude Fail has been occurring is at the threshold value or higher. NOTE: To clear this Fail, clear the value of NVM [752-059] (ATC Fail) or NVM [752-060] (ATC Fail Continuous Count) to '0'. If the machine is not repaired back to normal status, this Fail will occur again during the operation. NOTE: Setting the NVM [752-005] (Dispense Mode) to '0' (Timer Disp) or '2' (ICDC Disp) will prevent ATC related fail from occurring and enable you to use the M/C. However, this means that the Toner density will not be controlled.
• Remedy: 1. Install a Toner Cartridge that contains Toner. Copy a Test Chart (499T 00247), etc. and check whether the density has recovered. 2. Check the Toner Dispense Motor (Output Check [092-001]) for operation failure. (PL 8.2) 3. Check the Toner transport path for Toner blockage. 4. Check the connection between the ATC Sensor (Drum Cartridge) P615 and the ESS/ MCU PWB J409 for open circuit, short circuit, and poor contact. 5. Check for toner blockage within the Developer Unit. 6. If no problem is found, replace the following parts in sequence: • Drum Cartridge (PL 8.1) • ESS/MCU PWB (PL 18.1)

• Code: 093-312
• Description: Toner Dispense Motor Rotation Fail Regardless of low usage of toner from Toner Cartridge, it was detected to be empty.
• Remedy: Check the following: • The Toner Cartridge for improper installation • The Toner Dispense Motor (Output Check [092-001]) for operation failure. (PL 8.2) • The Toner transport path for Toner blockage. • The Drive Gear for wear and damage. If no problem is found, replace the following parts in sequence: • Toner Cartridge (PL 8.1) • ESS/MCU PWB (PL 18.1)