• 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: Replace the heating roller thermistor.

• 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. 3. 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 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: 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.