• Code: C5303
• Description: Cleaning lamp M break error After the cleaning lamp M ON signal is turned on, the cleaning lamp M break signal is detected continuously 5 times for 10 ms.
• Causes: Poor contact in the connector terminals. Defective cleaning lamp M. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC17 on the engine PWB and the connector on the drum unit M, and the continuity across the connector terminals. Repair or replace if necessary. Defective cleaning lamp M. Replace the drum unit M. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C5304
• Description: Cleaning lamp Y break error After the cleaning lamp Y ON signal is turned on, the cleaning lamp Y break signal is detected continuously 5 times for 10 ms.
• Causes: Poor contact in the connector terminals. Defective cleaning lamp Y. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC18 on the engine PWB and the connector on the drum unit Y, and the continuity across the connector terminals. Repair or replace if necessary. Defective cleaning lamp Y. Replace the drum unit Y. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C6000
• Description: Fuser thermistor 1/3 break error Fuser thermistor 1 detected 40 C/104 F or less during warming up. 40 C/104 F or less is detected between 10 s of continuation during worming up. Fuser thermistor 3 detected 40 C/104 F or less during warming up.
• Causes: Defective fuser heater 1/2. Defective fuser thermostat 1. Installation defectiveness on fuser thermistor 1/2. Defective PWB.
• Remedy: Defective fuser heater 1/2. Check for continuity across each heater. If none, replace the fuser unit. Defective fuser thermostat 1. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit. Installation defectiveness on fuser thermistor 1/2. Measure the resistance. If it is ∞Ω, replace the fuser unit. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6010
• Description: Abnormally high fuser thermistor temperature The fuser Abnormally high signal is detected for 60 s or more.
• Causes: Defective PWB.
• Remedy: Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6020
• Description: Abnormally high fuser thermistor 1/3 temperature The fuser temperature exceeds 240 C/ 464 F.
• Causes: Defective PWB. Installation defectiveness on fuser thermistor 1/3.
• Remedy: Defective PWB. Replace the power source PWB or engine PWB and check for correct operation. Installation defectiveness on fuser thermistor 1/3. Measure the resistance. If it is ∞Ω, replace the fuser unit.

• Code: C6030
• Description: Fuser thermistor 1/3 break error Fuser thermistor 1 detected 40 C/104 F or less during warming up. 40 C/104 F or less is detected between 10 s of continuation during worming up. Fuser thermistor 3 detected 40 C/104 F or less during warming up.
• Causes: Defective fuser heater 1/2. Installation defectiveness on fuser thermistor 1/3. Defective PWB.
• Remedy: Defective fuser heater 1/2. Check for continuity across each heater. If none, replace the fuser unit. Installation defectiveness on fuser thermistor 1/3. Measure the resistance. If it is ∞Ω, replace the fuser unit. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6050
• Description: Abnormally low fuser thermistor 3 temperature During copying, the temperature at the heat roller lower than 100 C/212 F is detected continuously for 1 s.
• Causes: Defective fuser heater 1/2. Defective PWB.
• Remedy: Defective fuser heater 1/2. Replace the fuser unit. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6100
• Description: Fuser heater 3 break Fuser thermistor 2 detected less than 100 C/212 F for 120 s during driving. Fuser thermistor 2 deduced less than 150 C/302 F for 300 s during driving. Fuser thermistor 2 deduced less than 100 C/212 F for 5 s during driving.
• Causes: Defective fuser heater 3. Defective fuser thermostat 2. Installation defectiveness on fuser thermistor 2. Defective PWB.
• Remedy: Defective fuser heater 3. Check for continuity across each heater. If none, replace the fuser unit. Defective fuser thermostat 2. Check for continuity across thermostat. If none, remove the cause and replace the fuser unit. Installation defectiveness on fuser thermistor 2. Measure the resistance. If it is ∞Ω, replace the fuser unit. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.