• Code: 543
• Description: High temperature detection: Software
  The thermistor detects 230°C for 0.2 seconds.
• Causes: Defective thermistor. Defective I/O board. Defective EGB.
• Remedy:

• Code: 544
• Description: High temperature detection: Hard
  The thermistor detects 250°C.
• Causes: Defective thermistor. Defective I/O board. Defective EGB. Defective fusing unit, PSU, or EGB.
• Remedy: 1. Replace the fusing unit. 2. Replace the PSU.

• Code: 545
• Description: Heating lamp error
  The fusing lamp is full-powered for 8 seconds after the heating roller reaches the print ready temperature.
• Causes: Deformed thermistor. Thermistor coming off. Defective fusing lamp.
• 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 three 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 ten zero cross signal detections. This error is defined when the detected zero cross signal is less than 17 for 200 ms.
• 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: 557
• Description: Zero cross frequency error
  The detection error occurs ten times in a row in ten zero cross signal detections. This error is defined when the detected zero cross signal is more than 28 for 200 ms. This SC is only logged. In this case, the power frequency is defined as 60 Hz.
• Causes: Noise (high frequency)
• Remedy: 1. Check the power supply source.

• Code: 559
• Description: Continuous paper jam at Fusing unit
  The paper jam occurs three times consecutively at the fusing unit only when the SP 1159 1 is set to "1 (ON)". If not, this SP does not occur. The jam counter is cleared when a sheet of paper is fed normally.
• Causes: Defective fusing entrance sensor. Defective EGB.
• Remedy: 1. Replace the fusing entrance sensor. 2. Replace the EGB.

• Code: 636
• Description: SD Card Error
• Causes: -001 [B] There is no expanded authentication module in the machine. The SD card or the file of the expanded authentication module is broken. There is no DESS module in the machine. • No expanded authentication module • Defective SD card • No DESS module 1. Install the expanded authentication module. 2. Install the SD card. 3. Install the DESS module. Version error -002 [B] The version of the expanded authentication module is not correct. • Incorrect module version 1. Install the correct file of the expanded authentication module.
• Remedy:

• Code: 670
• Description: Engine start-up error
  A command from the controller board is not received.
• Causes: Defective engine board
• Remedy: 1. Replace the engine board.