• Code: 534
• Description: Fusing exit sensor fan error
  The BICU does not receive the lock signal 10 seconds after turning on the fusing fan motor.
• Causes: Defective fusing fan motor
• Remedy: 1. Replace the fusing exit sensor fan motor (at the front right side of the machine).

• Code: 535
• Description: PSU fan 1/2 error
  The BICU does not receive the lock signal 10 seconds after turning on the PSU fan 1/2 motor.
• Causes: Defective PSU fan motor 1/2
• Remedy: 1. Replace the PSU fan motor 1/2

• 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
• Remedy: 1. Replace the controller fan motor.

• Code: 540
• Description: Fusing/Paper exit motor error
  The BICU 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. Replace the fusing/paper exit motor.

• Code: 541
• Description: Heating roller thermistor error 1
  The temperature measured by the heating roller thermistor does not reach 0°C for 6 seconds.
• Causes: Loose connection of the heating roller thermistor. Defective heating roller thermistor. Defective thermopiler disc.
• Remedy: 1. Check if the heating roller thermistor is firmly connected. 2. Replace the heating roller thermistor. 3. Replace the 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 thermistor is firmly connected. 2. Replace the thermistor. 3. Check or replace the thermopile. 4. Replace the heating roller lamp.

• 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.