• Code: 551
• Description: Pressure roller thermistor error
  The temperature measured by the pressure roller thermistor does not reach 0 °C for 6 seconds.
• Causes: • Loose connection of pressure roller thermistor • Defective thermopile • Defective pressure roller thermistor
• Remedy: 1. Check that the pressure roller thermistor is firmly connected. 2. Replace the pressure roller thermistor.

• Code: 552
• Description: Pressure roller warm-up error
  After the main switch is turned on or the door is closed, the pressure roller temperature does not reach the ready temperature within 70 seconds during fusing unit warm-up.
• Causes: • Pressure roller fusing lamp broken
• Remedy: 1. Check if the heating roller thermistor is firmly connected. 2. Replace the IH inverter.

• Code: 553
• Description: Pressure roller fusing lamp overheat (software error)
  The detected pressure roller temperature stays at 230°C or more for 1 second.
• Causes: • Defective PSU • Defective IOB • Defective BICU
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BICU.

• Code: 554
• Description: Pressure roller fusing lamp overheat (hardware error)
  The pressure roller thermistor detects 250°C or more.
• Causes: • Defective PSU • Defective IOB • Defective BICU • Defective fusing control system
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BICU.

• Code: 557
• Description: Zero cross frequency error
  When the zero cross signal is 66 or more and it is detected 10 times or more in 11 detections, the machine determines that input 60 Hz and SC557 occurs.
• Causes: • Noise (High frequency)
• Remedy: 1. Check the power supply source.

• Code: 559
• Description: Consecutive fusing jam
  The paper jam counter for the fusing unit reaches 3 times. The paper jam counter is cleared if the paper is fed correctly. This SC is activated only when SP1159-001 is set to "1" (default "0").
• Causes: • Paper jam in the fusing unit.
• Remedy: Remove the paper that is jammed in the fusing unit. Then make sure that the fusing unit is clean and has no obstacles in the paper feed path.

• Code: 561
• Description: Heating roller thermopile error
  The temperature measured by the thermopile does not reach 0 °C for 20 seconds.
• Causes: • Loose connection of the thermopile • Defective thermopile
• Remedy: 1. Check if the thermistor is firmly connected. 2. Replace the thermistor.

• Code: 562
• Description: Pressure roller temperature error
  The temperature of the pressure roller does not reach the ready temperature for 120 seconds after the fusing lamp has turned on.
• Causes: • Defective thermistor • Defective fusing lamp
• Remedy: 1. Replace the thermistor for the pressure roller. 2. Replace the fusing lamp.