• Code: C3500
• Description: Communication error between scanner and SHD An error code is detected.
• Causes: Poor contact in the connector terminals. Defective PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC18 on the main PWB and the connector on the CCD PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the main PWB or CCD PWB and check for correct operation.

• Code: C4000
• Description: Polygon motor synchronization problem The polygon motor does not reach the stable speed within 20 s of the START signal turning on.
• Causes: Poor contact in the connector terminals. Defective polygon motor. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC2 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary. Defective polygon motor. Replace the laser scanner unit. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C4010
• Description: Polygon motor steady-state problem Stable OFF is detected for 5 s continuously after polygon motor stability.
• Causes: Poor contact in the connector terminals. Defective polygon motor. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC2 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary. Defective polygon motor. Replace the laser scanner unit. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C4200
• Description: BD steady-state problem ASIC detects a BD error A for 2 s after the polygon motor rotation has been stabilized.
• Causes: Poor contact in the connector terminals. Defective laser scanner unit. Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC2 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary. Defective laser scanner unit. Replace the laser scanner unit. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C6000
• Description: Fuser heater break Fuser thermistor 1 detected less than 40C/104F for 10 s during warm-up and ready in.
• Causes: Defective fuser heater M or S. Installation defectiveness on fuser thermistor 1. Defective fuser thermostat. Defective PWB.
• Remedy: Defective fuser heater M or S. Replace the fuser heater M or S. Installation defectiveness on fuser thermistor 1. Check the mounting state of the fuser thermistor 1. If any problem is found, repair it. Defective fuser thermostat. Replace the fuser thermostat. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6020
• Description: Abnormally high fuser thermistor center temperature Fuser thermistor 2 is detected 230C/ 446F or more for 40 ms.
• Causes: Installation defectiveness on fuser thermistor 2. Defective fuser thermistor 2.Defective engine PWB.
• Remedy: Installation defectiveness on fuser thermistor 2. Check the mounting state of the fuser thermistor 2. If any problem is found, repair it. Defective fuser thermistor 2. Replace the fuser thermistor 2. Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C6050
• Description: Abnormally low fuser thermistor center temperature Fuser thermistor 2 is detected 100C/ 212F less than 1 s continuously during copying.
• Causes: Defective fuser heater M or S. Installation defectiveness on fuser thermistor 2. Defective PWB.
• Remedy: Defective fuser heater M or S. Replace the fuser heater M or S. Installation defectiveness on fuser thermistor 2. Check the mounting state of the fuser thermistor 2. If any problem is found, repair it. Defective PWB. Replace the power source PWB or engine PWB and check for correct operation.

• Code: C6120
• Description: Abnormally high fuser thermistor edge temperature Fuser thermistor 1 is detected 230C/ 446F or more for 40 ms.
• Causes: Installation defectiveness on fuser thermistor 1. Defective fuser thermistor 1. Defective engine PWB.
• Remedy: Installation defectiveness on fuser thermistor 1. Check the mounting state of the fuser thermistor 1. If any problem is found, repair it. Defective fuser thermistor 1. Replace the fuser thermistor 1. Defective engine PWB. Replace the engine PWB and check for correct operation.