• Code: SC550
• Description: Heating roller thermistor 3 (side): hardware error
  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: SC551
• Description: Pressure roller thermistor error 1
  The temperature measured by the pressure roller thermistor did not reach 0°C after 10 attempts.
• Causes: • Do SP5810 to cancel the SC fusing code. • Loose connection of the pressure roller thermistor • Thermistor positioned incorrectly • Defective pressure roller thermistor

• Code: SC552
• Description: Pressure roller thermistor error 2
  After the main switch is turned on or the cover is closed, the heating roller temperature did not reach the ready temperature (45°C) within 80 sec. after the fusing lamp switches on. -or- If the fusing unit did not reach the reload temperature after 350 sec.
• Causes: • Pressure roller thermistor harness loose, disconnected, defective • Pressure roller thermistor defectives.

• Code: SC553
• Description: Pressure roller thermistor (software) error
  The thermistor detected a temperature over 220°C 12 times within 1 sec.
• Causes: • Do SP5810 to cancel the SC fusing code. • TRIAC short, AC drive board defective • VBCU defective

• Code: SC554
• Description: Pressure roller thermistor (hardware) error
  The thermistor detected a temperature over 230°C.
• Causes: • Do SP5810 to cancel the SC fusing code • TRIAC short, AC drive board defective • VBCU defective

• Code: SC555
• Description: Pressure roller fusing lamp remains on
  After hot roller reaches warm-up temperature, the pressure roller fusing lamp remained for 300 sec. while the hot roller is not rotating.
• Causes: • Do SP5810 to cancel the SC fusing code. • Thermistor damaged, or out of position • Fusing lamp disconnected, broken

• Code: SC556
• Description: Heating roller fusing lamp error
  After hot roller reaches warmup temperature, the heating roller fusing lamp (ends) remains for 10 sec. while the hot roller is not rotating.
• Causes: • Thermistor damaged, or out of position • Fusing lamp disconnected, broken

• Code: SC557
• Description: Zero Cross Over Error
  At power on the fusing relay was detected as defective.
• Causes: • Replace the AC drive board.