• Code: 534-02
• Description: Tube cooling fan error
  The machine does not detect the fan motor lock signal for 100 ms while the third duct fan or tube cooling fan turns on.
• Causes: • Disconnected harness • Overload on the third duct fan motor or tube cooling fan motor • Defective third duct motor or tube cooling motor • Defective IOB
• Remedy: 1. Check or replace the harness. 2. Replace the third duct fan or tube cooling fan. 3. Replace the IOB.

• Code: 535
• Description: Paper exit fan error
  The machine does not detect the fan motor lock signal for 100 ms 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: 538
• Description: AC controller board fan error
  The machine does not detect the fan motor lock signal for 100 ms while the AC controller board fan turns on.
• Causes: • Disconnected harness • Overload on the AC controller board fan motor • Defective AC controller board fan motor • Defective IOB
• Remedy: 1. Check or replace the harness. 2. Replace the AC controller board fan. 3. Replace the IOB.

• Code: 540
• Description: Fusing/Paper exit motor error
  The IOB does not receive the lock signal 100 ms after turning on the fusing/ paper exit motor.
• Causes: • Motor overload • Defective fusing/paper exit motor • Shorted +24V fuse on the PSU
• Remedy: 1. Check or replace the harness. 2. Replace the fusing/paper exit motor. 3. Replace the +24V fuse on the PSU.

• Code: 541
• Description: Heating roller thermopile error
  The temperature detected 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 80°C for 20 seconds after the inverter turned on. • The center temperature of the heating roller does not reach the ready temperature for 90 seconds after the fusing lamp turned on.
• Causes: • Dirty or defective thermopile
• Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the thermopile.

• Code: 543
• Description: Heating roller overheat: Center (software error)
  The detected fusing temperature stays at 215°C for 1 second for 10 consecutive times.
• Causes: • Defective AC controller board • Defective IOB • Defective IPU
• Remedy: 1. Replace the AC controller board. 2. Replace the IOB. 3. Replace the IPU.

• Code: 544
• Description: Heating roller overheat: Center (hardware error)
  During stand-by mode or a print job, the detected heating roller temperature reaches 220°C.
• Causes: • Defective AC controller board • Defective IOB • Defective IPU • Defective fusing control system
• Remedy: 1. Replace the AC controller board. 2. Replace the IOB. 3. Replace the IPU. 4. Replace the fusing unit and reset the counter of the fusing unit using SP3-902-014. Important: The fusing unit cannot be used because an abnormal high temperature was detected. After this SC occurs, the counter reset of the fusing unit should be done manually using SP3-902-014 because the counter reset is not done automatically.