• Code: 504-02
• Description: Tray 4 error (3 Tray Paper Feed Unit)
  When the main switch is turned or when the tray is set and if the upper limit is already detected, the lift motor turns on to lower the bottom plate until the lift sensor goes off. If the motor turns on for 7 seconds or more, the machine asks the user to reset the tray. If this condition occurs 3 consecutive times, this SC is generated.
• Causes: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection

• Code: 530
• Description: Fusing fan motor error
  The BCU does not receive the lock signal (CN210-B5) 5 seconds after turning on the fusing fan.
• Causes: • Defective fusing fan motor or connector disconnection • Defective BCU

• Code: 541
• Description: Heating roller thermistor error
  The temperature measured by the heating roller thermistor does not reach 7 °C for ten seconds.
• Causes: • Loose connection of the heating roller thermistor • Defective heating roller thermistor • Defective BCU

• Code: 542
• Description: Heating roller warm-up error
  After the main switch is turned on or the cover is closed, the heating roller temperature does not reach the ready temperature within 60 seconds during fusing unit warm-up.
• Causes: • Heating roller fusing lamp broken • Defective heating roller thermistor • Defective BCU

• Code: 543
• Description: Heating roller fusing lamp overheat
  The detected fusing temperature stays at 210°C or more for five seconds.
• Causes: • Defective PSU • Defective BCU

• Code: 544
• Description: Heating roller fusing lamp high temperature error
  During stand-by mode or a print job, the detected heating roller temperature stays at 210 °C or more for 0.2 second.
• Causes: • Defective heating roller thermistor • Defective PSU • Defective BCU

• Code: 545
• Description: Heating roller fusing lamp consecutive full power
  When the fusing unit is not running in the Ready condition, the heating roller fusing lamp keeps on with full power for 30 consecutive seconds.
• Causes: • Heating roller thermistor out of position

• Code: 546
• Description: Heating roller fusing lamp temperature fluctuation
  The heating roller temperature changes by ±20°C or more in one second. This occurs three times in one minute or two consecutive times.
• Causes: • Loose connection of the thermistor • Loose connection between the fusing unit and main frame