• Code: 541
• Description: Thermistor Error
  The thermistor output is less than 0°C for 7 seconds.
• Causes: Disconnected thermistor. Defective harness connection.
• Remedy: 1. Check the harness connection of the thermistor. 2. Replace the fusing unit. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 542
• Description: Print Ready Temperature Error
  The heating roller temperature increase during a set time is not correct. The fusing temperature does not reach the print ready temperature within a set time after the fusing lamp has turned on.
• Causes: Defective thermistor. Incorrect power supply input at the main power socket. Defective fusing lamp.
• Remedy: 1. Check the voltage of the wall outlet. 2. Replace the fusing unit 3. Replace the fusing lamp. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 543
• Description: High Temperature Detection Error
  This SC is issued if one of following conditions occurs: The thermistor (center) detects 255°C or thermistor (end) detects 245°C. The thermistor (center) detects a 3°C increment or more for five seconds at 220°C or more or the thermistor (end) detects a 4°C increment or more for five seconds at 210°C or more.
• Causes: Defective I/O control (EGB). Defective EGB.
• Remedy: 1. Replace the EGB • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 545
• Description: Heating Lamp Full-Power Error
  The fusing lamp is fully-powered for a certain time while the fusing unit stays in the stand-by mode and is not rotating.
• Causes: Deformed thermistor. Thermistor not in the correct position. Defective fusing lamp.
• Remedy: 1. Replace the fusing unit. 2. Replace the fusing lamp. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 547
• Description: Zero Cross Error
  The zero cross signal is not detected for three seconds even though the fusing lamp relay is on after turning on the main power or closing the front door.
• Causes: Defective fusing lamp relay
• Remedy: 1. Turn the main power switch off and on. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 548
• Description: Low Temperature Error
  The center thermistor detects 100°C or less for 4 seconds.
• Causes: Defective fusing lamp. Defective thermistor
• Remedy: 1. Replace the fusing unit. 2. Replace the fusing lamp. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 557
• Description: Zero Cross Frequency Error
  The detection error occurs ten times consecutively in ten zero cross signal detections. This error is defined when the detected zero cross signal is 17 or less/27 or more for 0.2 seconds.
• Causes: Defective fusing lamp relay. Unstable input power source.
• Remedy: 1. Check the power supply source. 2. Replace the fusing unit. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.

• Code: 559
• Description: Consecutive Fusing Jam
  The paper jam counter for the fusing unit reaches 3. The paper jam counter is cleared if the paper is fed correctly. This SC is activated only when this function is enabled with "Engine Maintenance" (default "OFF").
• Causes: Defective fusing unit. Defective fusing control.
• Remedy: 1. Clear this SC to send a command after a jam removal. 2. Turn off this function after a jam removal. • Execute "Fuser SC Reset" with SOM to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code cannot be operated.