• Code: 535
• Description: Paper exit fan error
  The machine does not detect the fan motor lock signal for 2 seconds while the paper exit fan turns on.
• Causes: • Disconnected harness • Overload on the paper exit fan motor • Defective paper exit motor • Defective IOB
• Remedy: 1. Check or replace the harness. 2. Replace the paper exit fan. 3. Replace the IOB

• Code: 540
• Description: Fusing/Paper exit motor error
  The IOB does not receive the lock signal 10 seconds after turning on the fusing/ paper exit motor.
• Causes: • Motor overload • Defective fusing/paper exit motor
• Remedy: Replace the fusing/paper exit motor.

• Code: 541
• Description: Heating roller thermopile error
  The temperature measured by the heating roller thermopile does not reach 0°C for 6 seconds.
• Causes: • Loose connection of the heating roller thermopile • Defective heating roller thermopile • Defective thermopile
• Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the heating roller thermopile.

• Code: 542
• Description: Heating roller warm-up error 1
  • The heating roller temperature does not reach the ready temperature for 190 seconds after the heating lamp on. • The heating roller temperature does not reach 80°C for 18 seconds after the IH inverter on.
• Causes: • Dirty or defective thermopile • Defective IH coil unit
• Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the thermopile. 3. Replace the IH coil unit.

• Code: 543
• Description: Heating roller overheat 1 (software error)
  The detected fusing temperature stays at 215°C for 1 second.
• Causes: • Defective PSU • Defective IOB • Defective BCU
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BCU.

• Code: 544
• Description: Heating roller overheat 1 (hardware error)
  During stand-by mode or a print job, the detected heating roller temperature reaches 220 °C.
• Causes: • Defective PSU • Defective IOB • Defective BCU • Defective fusing control system
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BCU.

• 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 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 39.
• Causes: • Defective fusing relay • Defective fusing relay circuit • Shorted +24V fuse on the PSU • Unstable power supply
• Remedy: 1. Check the power supply source. 2. Replace the +24V fuse on the PSU. 3. Replace the PSU

• Code: 548
• Description: Fusing unit rotation error
  The fusing belt sensor does not detect change in the actuator for 0.5 seconds after the fusing/paper exit motor has turned on.
• Causes: • Defective fusing/paper exit motor • Deformed actuator for the fusing belt sensor • Defective fusing belt sensor • Broken connection between IH inverter and IOB • Incorrectly set fusing unit
• Remedy: 1. Check if the fusing unit is correctly set. 2. Check or replace the actuator for fusing belt sensor. 3. Replace the fusing belt sensor. 4. Replace the IH inverter. 5. Check the connection between IH inverter and IOB.