• Code: 543
• Description: Fusing overheat error (center)
  The fusing temperature is over 230°C for 1 second (detected by the thermistor).
• Causes: • Fusing thermistor • Power supply board

• Code: 544
• Description: Fusing overheat error (center) 2
  The fusing temperature is over 250°C for more than a certain time (zero cross signal x 3). (detected by the fusing temperature monitor circuit).
• Causes: • Fusing thermistor • Power supply board

• Code: 545
• Description: Fusing lamp overheat error (center)
  After the fusing temperature reaches the target temperature, the fusing lamp does not turn off for 29 consecutive seconds.
• Causes: • Fusing thermistor defective or out of position • Power supply board • Broken fusing lamp cables

• Code: 547
• Description: Zero cross signal malfunction (D160/D161/D170)
  Detecting low-frequency wave
• Causes: • Defective PSU • Defective BICU

• Code: 547-01
• Description: Zero cross signal malfunction(D158/D159)
  Zero cross signals are detected three consecutive times at 50 ms intervals. This error is detected before the fusing relay is turned on after turning on the main power or closing all the doors.
• Causes: • Defective fusing relay • Defective fusing relay circuit • Defective PSU • Power supply board

• Code: 547-02
• Description: Zero cross signal malfunction (D158/D159)
  The zero cross signal is not detected for 3 seconds even though the fusing relay is on after turning on the main power or closing all the doors.
• Causes: • Defective fusing relay • Defective fusing relay circuit • Defective PSU • Power supply board

• Code: 547-03
• Description: Zero cross signal malfunction(D158/D159)
  A detection error occurs twice or more in 11 frequency detections. This error is defined when the detected zero cross signal is less than 45.
• Causes: • Defective fusing relay • Defective fusing relay circuit • Defective PSU • Power supply board

• Code: 551
• Description: Fusing thermistor open (rear)
  The fusing temperature is below 0°C for 5 seconds (detected by the thermistor)
• Causes: Fusing thermistor defective or out of position • Loose connectors