• 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 30 seconds.
• Causes: • Broken heating roller thermostat • Broken heating roller fusing lamp
• Remedy: 1. Replace the heating roller thermostat. 2. Replace the heating roller fusing lamp.

• Code: 547
• Description: Zero cross error
  • The zero cross signal is detected for 0.05 seconds three times even though the heater relay is off when turning on the main power. • The zero cross signal is not detected for 3 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 shorted 24V fuse on the PSU. 3. Replace the PSU

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

• Code: 552
• Description: Heating roller warm-up error 2
  The heating roller temperature does not reach the ready temperature while 70 seconds after the heating lamp on.
• Causes: • Dirty or defective thermistor (end) • Heating roller fusing lamp broken • Defected thermostat • Defective heating roller fusing lampamp on.
• Remedy: 1. Check if the heating roller thermistor (end) is firmly connected. 2. Replace the heating roller thermistor (end). 3. Replace the heating roller fusing lamp.

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

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

• Code: 555
• Description: Heating 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 heating roller thermostat • Broken heating roller fusing lamp
• Remedy: 1. Replace the heating roller thermostat. 2. Replace the heating roller fusing lamp.

• 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: Check the power supply source.