• Code: 552
• Description: Warm-up time over (pressure roller)
  The main switch is turned on or a cover is closed. The fusing pressure roller does not reach the ready temperature within 200 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (thermistor loose connection, fusing - drawer loose connection)

• Code: 553
• Description: Overheat error (pressure roller)
  The pressure roller thermistor detects 165°C for 5 seconds.
• Causes: • Loose connection • Defective BICU board • Defective PSU

• Code: 554
• Description: Low temperature error (pressure roller)
  During standby or operation, the pressure roller thermistor detects 60°C or less for 5 seconds.
• Causes: • Defective lamp (loose connection, thermostat failure, PSU, thermostat) • Incorrect detection (thermistor loose connection, fusing - drawer loose connection)

• Code: 555
• Description: Full power error (pressure roller)
  Fusing unit warm-up is complete. The fusing pressure roller stops turning. The pressure roller lamp keeps outputting the maximum power for 150 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 556
• Description: Unstable temperature (pressure roller)
  The pressure roller thermistor detects unstable temperature increases or decreases within 60 seconds.
• Causes: • Thermistor loose connection • Fusing - drawer loose connection

• Code: 557
• Description: Zero cross over error
  The main switch is turned on; the fusing relay turns on. The detected zero cross is out of the target range (less than 45 or more than 65). The zero cross is detected more than 65 in ten cases out of eleven zero cross detections.
• Causes: • Noise from a power supply line

• Code: 570
• Description: Fusing oil end
  500 sheets of paper have been output since oil end was detected.
• Causes: • Insufficient oil (the oil tank in the rear of the machine) • Defective oil pipe • Defective oil pump • Defective oil end sensor

• Code: 571
• Description: Fusing oil overflow
  • The oil overflow sensor detects oil. • When the machine covers are closed, the oil supply unit is not detected. • When the machine covers are closed, the fusing unit is not detected.
• Causes: • Defective oil end sensor • Defective oil overflow sensor • Defective sensor cable • Oil supply unit not installed