• Code: 555
• Description: Fusing Heater error: End The fusing heater keeps full power for 19 seconds or more.
• Causes: • Defective thermistors • Disconnected cables
• Remedy: 1. Replace the thermistors. 2. Check and replace the cables.

• 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) • Defective AC control board
• Remedy: 1. Check the power supply source. 2. Replace the AC control board.

• 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 SP1-159-001 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: Pressure roller thermistor error: End
  The temperature at the end of the pressure roller measured by the thermistor does not reach 0°C for 37 seconds.
• Causes: • Loose connection of the thermistor • Defective thermistor
• Remedy: 1. Check if the thermistor is firmly connected. 2. Replace the thermistor at the end of the pressure roller.

• Code: 562
• Description: Pressure roller thermistor warm-up error: End
  The heating roller rotation sensor does not reach 20°C for 100 seconds after the fusing/paper exit motor has turned on with sheets of 257 mm or more in width.
• Causes: • Dirty thermopile lenses • Defective thermistor
• Remedy: 1. Clean the thermopile lenses. 2. Replace the thermistor at the end of the pressure roller.

• Code: 563
• Description: Pressure roller overheat: End (software error)
  The detected pressure roller temperature stays at 215°C or more for 1 second for 10 consecutive times.
• Causes: • Defective AC controller board • Defective IOB • Defective IPU
• Remedy: 1. Replace the AC controller board. 2. Replace the IOB. 3. Replace the IPU.

• Code: 564
• Description: Pressure roller overheat: End (hardware error)
  The thermistor detects 220°C or more.
• Causes: • Defective AC controller board • Defective IOB • Defective IPU • Defective fusing control system
• Remedy: 1. Replace the AC controller board. 2. Replace the IOB. 3. Replace the IPU. 4. Replace the fusing unit and reset the counter of the fusing unit using SP3-902-014. • The fusing unit cannot be used because an abnormal high temperature was detected. • After this SC occurs, the counter reset of the fusing unit should be done manually using SP3-902-014 because the counter reset is not done automatically.

• Code: 569-00
• Description: Pressure roller contact sensor error
  Pressure roller contact sensor does not detect the pressure roller position three times
• Causes: • Broken or defective pressure roller contact sensor • Deformed or broken pressure roller contact sensor feeler • Defective pressure roller contact motor • Defective fusing unit
• Remedy: 1. Check or replace the harness of the pressure roller contact sensor. 2. Replace the pressure roller contact sensor. 3. Replace the pressure roller contact motor.