• Code: 534
• Description: Second duct fan error
  The machine does not detect the fan motor lock signal for 2 seconds while the second duct fan turns on.
• Causes: • Disconnected harness • Overload on the second duct fan motor • Defective second duct motor • Defective IOB
• Remedy: 1. Check or replace the harness. 2. Replace the second duct fan. 3. Replace the IOB.

• 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: 536
• Description: Controller fan error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective controller fan motor • Disconnected or defective harness • Defective IOB
• Remedy: 1. Replace the third duct fan motor. 2. Check or replace the harness. 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: 1. Check or replace the harness. 2. 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
  • After the main switch is turned on or the cover is closed, the increment of the heating roller temperature per 10 seconds is 30°C or less. If this condition is detected five times consecutively, SC 542 is defined. • The heating roller temperature does not reach 100°C for 15 seconds after the heating lamp on. • The heating roller temperature does not reach the ready temperature while 60 seconds after the heating lamp on. • The center temperature of the heating roller does not reach the ready temperature for 30 seconds after the both edge temperature of the heating roller has reached the ready temperature.
• Causes: • Dirty or defective thermopile • Defective thermistor • Defective heating roller lamp
• 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 fusing lamp overheat 1 (software error)
  The detected fusing temperature stays at 230°C for 1 second.
• Causes: • Defective PSU • Defective IOB • Defective BICU
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BICU.

• Code: 544
• Description: Heating roller fusing lamp overheat 1 (hardware error)
  During stand-by mode or a print job, the detected heating roller temperature reaches 250 °C.
• Causes: • Defective PSU • Defective IOB • Defective BICU • Defective fusing control system
• Remedy: 1. Replace the PSU. 2. Replace the IOB. 3. Replace the BICU.