• Code: 533
• Description: PSU fan motor error
  The motor lock signal error is detected 50 consecutive times (5 seconds) after the motor lock signal was first detected.
• Causes: Defective fan motor. Disconnected or defective harness. Defective BICU
• Remedy: 1. Check or replace the harness. 2. Replace the fan motor. 3. Replace the BICU.

• Code: 540
• Description: Fusing motor error
  The machine detects a High signal from the fusing motor 20 consecutive times after the motor turned on.
• Causes: Motor overload. Defective fusing motor. Shorted +24 fuse on the PSU.
• Remedy: 1. Check or replace the harness. 2. Replace the fusing motor. 3. Replace the +24 fuse on the PSU.

• Code: 541
• Description: Heating roller thermopile error
  The temperature detected by the heating roller thermopile does not reach 0°C within the prescribed time for 10 consecutive times.
• Causes: Loose connection of the heating roller thermopile. Defective heating roller thermopile. Defective thermopilee.
• Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the heating roller thermopile.

• Code: 542-02, 542-03
• Description: Heating roller thermopile reload error. The heating roller temperature does not reach 80C within the prescribed time. The center temperature of the heating roller does not reach the target reload permit temperature within the prescribed time. The center temperature of the heating roller does not reach the target temperature after starting the heater control in warm up with low temperature.
• Causes: Dirty or defective thermopile lenses. Defective thermistor. Input voltage out of specification (out of warranty).
• Remedy: 1. Check and clean the thermopile lenses. 2. Check if the heating roller thermopile is firmly connected. 3. Replace the thermopile.

• Code: 543
• Description: Heating roller thermopile overheat (software error)
  The temperature detected by the heating roller thermopile stays at the prescribed temperature within the prescribed time.
• Causes: Defective PSU. Defective BICU.
• Remedy: 1. Replace the PSU. 2. Replace the BICU.

• Code: 544
• Description: Heating roller thermopile overheat (hardware error)
  The temperature detected by the heating roller thermopile reaches the prescribed temperature.
• Causes: Defective BICU. Defective fusing control system.
• Remedy: 1. Replace the BICU.

• Code: 545
• Description: Heating roller fusing lamp consecutive full power
  When the fusing unit is not running in the ready condition, the heating roller fusing lamp keeps on full power for the prescribed time.
• Causes: Defective thermistor. Broken heater.
• Remedy: 1. Replace the thermistor. 2. Replace the heating roller fusing lamp.

• Code: 547-01
• Description: Zero cross error: fusing lamp relay contact welding
  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 11 zero cross signal detections. This error is defined when the detected number of zero cross signals is less than 45.
• Causes: Defective fusing lamp relay (welded contacts). Defective fusing lamp relay circuit.
• Remedy: 1. Turn off and on the main power switch. 2. Replace the PSU if the fusing lamp relay is defective. 3. Check the connection of the PSU to the controller board and replace the harness or controller board if necessary.