• Code: 534
• Description: Fusing rear fan error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective fusing rear fan • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the fusing rear fan. 3. Replace the BCU.

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

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

• Code: 540
• Description: Fusing/Paper exit motor error
  The BCU does not receive the lock signal 2 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 detected 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
  • The heating roller temperature does not reach 80°C for 20 seconds. • The center temperature of the heating roller does not reach the ready temperature for 90 seconds.
• Causes: • Dirty or defective thermopile
• Remedy: 1. Check if the heating roller thermopile is firmly connected. 2. Replace the thermopile.

• Code: 543
• Description: Heating roller fusing lamp overheat 1 (software error)
  The temperature detected by the heating roller thermopile stays at 230°C for 1 second.
• Causes: • Defective PSU • Defective IPU • Defective BCU
• Remedy: 1. Replace the PSU. 2. Replace the IPU. 3. Replace the BCU.

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