• Code: SC540
• Description: Fusing/exit motor error
  Motor operation was detected abnormal at power on.
• Causes: • Check inside the fusing unit for any obstructions • Motor harness loose, broken, defective • Motor or its driver board defective

• Code: SC541
• Description: Heating roller thermistor (center) error 1
  The "floating" (non-contact) thermistor at the center of the heating roller is not operating correction.
• Causes: • Thermistor harness connection loose, disconnected, defective • Thermistor installed incorrectly • Thermistor defective

• Code: SC543
• Description: Heating roller thermistor (center) error 2
  The thermistor at the center of the heating roller detected an abnormally high temperature (over 250°C)
• Causes: • Do SP5810 to cancel the SC fusing code. • TRIAC short, AC drive board defective • VBCU defective

• Code: SC544
• Description: Heating roller thermistor (center) error 3
  The thermistor detected a temperature over 260°C..
• Causes: • Do SP5810 to cancel the SC fusing code. • TRIAC short, AC drive board defective • VBCU defective

• Code: SC545
• Description: Lamp remains on
  After hot roller reaches warm-up temperature, the center fusing lamps in the heating roller remained on at full capacity after reaching the warm-up temperature while the hot roller was not rotating.
• Causes: • Do SP5810 to cancel the SC fusing code. • Heating roller thermistor damaged, or out of position • Fusing lamp disconnected, broken

• Code: SC546
• Description: Heating roller thermistor error (side)
  The temperature measured by the heating roller thermistor does not reach 0°C after 50 sec. and remains over this temperature for 10 readings.
• Causes: • Loose connection of the heating roller thermistor • Defective heating roller thermistor

• Code: SC547
• Description: Zero cross error
  When the main switch is turned on, the machine checks how many zero-cross signals are generated within 500 ms. This SC code is issued if the number of zero-cross signals detected is not within specification. Note: Zero cross signals, generated from an ac power supply, are used to generate a trigger pulses to control the applied power accurately.
• Causes: • Do SP5810 to cancel the SC fusing code. • Electrical noise on the power supply line • Fusing relay damaged, replace the AC drive board.

• Code: SC549
• Description: Heating roller thermistor (center): software error
  The thermistor detected a temperature over 250°C 10 times within 1 sec.
• Causes: • Do SP5810 to cancel the SC fusing code. • TRIAC short, AC drive board defective • VBCU defective