• Code: 522
• Description: Fusing Unit Drive Motor
  Error The lock signal goes LOW after the motor starts and gets to the set speed. If the fusing motor lock signal stayed HIGH for 5 seconds during motor operation, the motor stopped because of overloading.
• Causes: • Check that the motor drive path is not overloaded. • Replace the motor.

• Code: 530
• Description: Fusing Unit Ventilation Fan Error
  The lock signal goes LOW after the motor starts and gets to the set speed. If the fan motor lock signal stayed HIGH for 5 seconds during motor operation, the motor stopped because of overloading.
• Causes: • Check that the motor is not overloaded. • Replace the motor.

• Code: 541-1
• Description: Fusing Thermistor Error 1
  • The measured temperature of the hot roller stayed below 7C (44.6F) for 60 seconds after the machine was switched on. -or- • During machine operation the hot roller temperature fell to and stayed at 7C (44.6F) for 40 seconds.
• Causes: • Make sure that the thermistor is set correctly. • Make sure that the thermistor cable is connected. • Replace the thermistor.

• Code: 541-2
• Description: Fusing Thermistor Error 2
  The analog voltage input from the hot roller temperature was less than 2 V for three measurements. The thermistor has short-circuited.
• Causes: • Replace the thermistor.

• Code: 542
• Description: Fusing Temperature Warm-up Error
  The hot roller did not get to the ready temperature within 4 minutes 30 sec.: • After the machine was switched on. • After the upper unit or roll feeder drawer was closed. • During warm-up.
• Causes: • Check the fusing lamp connections. • Replace the fusing lamp. • Replace the MCU. • Check the hot roller thermistor. Make sure that it is straight and does not touch the hot roller.

• Code: 543
• Description: Fusing Lamp Overheated: Error 1 (Software)
  A fusing temperature more than 230 °C (446°F) was detected 3 times (measured at 180 ms intervals). Note: A shorted triac or other problem could cause the fusing lamp to stay on.
• Causes: • Replace the MCU.

• Code: 544
• Description: Fusing Lamp Overheated: Error 2 (Hardware)
  A short circuit in the triac on the MCU caused the fusing temperature control to stop or operate incorrectly. A special circuit on the MCU monitors the temperature of the board. The temperature around the board was more than 235C. 544-1 Latch Signal On (50 ms) 544-2 Signal On (1 s)
• Causes: • Replace the MCU.

• Code: 545
• Description: Fusing Lamp Overheated: Error 3
  After it got to the ready temperature, the fusing lamp stayed on at full power for 50 seconds while the hot roller did not turn.
• Causes: Correct the position of the thermistor on the hot roller. Replace the fusing lamp harness. Replace the MCU.