• Code: 535
• Description: Controller box fan error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective controller box fan • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the controller box fan. 3. Replace the BCU.

• Code: 536
• Description: Junction gate solenoid fan error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective junction gate solenoid fan • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the junction gate solenoid fan. 3. Replace the BCU.

• Code: 540
• Description: Fusing/Paper exit motor error
  The BCU receives the lock signal 2.0 seconds after turning on the fusing/paper exit motor.
• Causes: • Motor overload • Defective fusing/paper exit motor • Defective or disconnected connection for the fusing/paper exit motor
• Remedy: 1. Replace the fusing/paper exit motor. 2. Check or replace connector and harness for the fusing/paper exit motor.

• Code: 541
• Description: Heating roller error 1 The temperature detected by the thermopile does not reach 0°C for 6 seconds.
• Causes: • Loose connection of the thermopile • Defective thermopile
• Remedy: 1. Check that the thermopile is firmly connected. 2. 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 edge temperature of the heating roller has reached the ready temperature
• Causes: • Dirty or defective thermopile • Defective thermopile. • Trash on the surface of the thermopile lens. • Defected thermistor. • Input voltage is over guaranteed value • Defective heating roller lamp
• Remedy: 1. Check if the thermopile is firmly connected. 2. Clean the surface of the thermopile lens. 3. Test the conductance for the thermopile and the heating roller 4. Replace the thermopile. 5. 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 BCU
• Remedy: 1. Replace the PSU. 2. Replace the BCU.

• 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 BCU • Defective heating roller thermistor (end) • Defective fusing control system
• Remedy: 1. Replace the PSU. 2. Replace the BCU. 3. Replace the heating roller thermistor (end).

• Code: 545
• Description: Heating roller fusing lamp consecutive full power 1
  When the fusing unit is not running in the ready condition, the heating roller fusing lamp keeps on full power for 8 seconds.
• Causes: • Broken heating roller thermostat • Broken heating roller fusing lamp
• Remedy: 1. Replace the heating roller thermistor. 2. Replace the heating roller fusing lamp.