• Code: 545
• Description: Heating roller fusing lamp consecutive full power 1
  When the fusing unit is not running in the ready condition, the heating roller fusing lamp keeps on full power for 8 seconds.
• Causes: Broken heating roller thermistor
• Remedy:

• Code: 547
• Description: Zero cross error
  The zero cross signal is detected three times even though the heater relay is off when turning on the main power. The zero cross signal is not detected for 2 seconds even though the heater relay is on after turning on the main power or closing the front door. The detection error occurs twice or more in the 11 zero cross signal detections. This error is defined when the detected zero cross signal is less than 45.
• Causes: Defective fusing lamp relay. Defective fusing lamp relay circuit. Unstable power supply.
• Remedy: 1. Check the power supply source. 2. Replace the PSU

• 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 thermopile.

• 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 pressure roller thermistor is firmly connected. 2. Replace the pressure roller fusing lamp.

• 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 pressure roller thermistor. 2. Replace the PSU. 3. Replace the IOB. 4. 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 pressure roller thermistor. 2. Replace the PSU. 3. Replace the IOB. 4. Replace the BICU.

• Code: 555
• Description: Pressure roller lamp consecutive full power 2
  When the fusing unit is not running in the ready condition, the pressure roller-fusing lamp keeps ON full power for 8 seconds or more.
• Causes: Broken pressure roller fusing lamp
• Remedy: 1. Replace the pressure roller fusing lamp. 2. Replace the PSU.

• 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.