• Code: 531
• Description: Fusing Fan Motor Error A LOCK signal is not detected for more than ten seconds while the motor START signal is on and if this error occurs twice consecutively, this SC is issued.
• Causes: • Disconnected or defective motor harness. • Defective LSU fan motor
• Remedy: 1. Check or replace the motor harness. 2. Replace the fusing fan motor.

• Code: 541
• Description: Thermistor Error The thermistor output is less than 0°C for 7 seconds.
• Causes: • Disconnected thermistor • Defective harness connection
• Remedy: Defective harness connection 1. Check the harness connection of the thermistor. 2. Replace the fusing unit. • Execute "Engine Maintenance Menu" 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 "Engine Maintenance Menu" 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 255C or thermistor (end) detects 245C. • The thermistor (center) detects a 3C increment or more for five seconds at 220C or more or the thermistor (end) detects a 4C increment or more for five seconds at 210C or more.
• Causes: • Defective I/O control (EGB) • Defective EGB
• Remedy: 1. Replace the EGB • Execute "Engine Maintenance Menu" 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 "Engine Maintenance Menu" 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 "Engine Maintenance Menu" to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated. The power should be turned off and on after the recovery procedure.

• 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 "Engine Maintenance Menu" 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. 3. Turn the main power switch off and on. • Execute "Engine Maintenance Menu" to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated. The power should be turned off and on after the recovery procedure.