• 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: • Check or replace the harness. • Replace the fusing rear fan. • 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: • Check or replace the harness. • Replace the drive unit fan. • 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: • Check or replace the harness. • Replace the toner supply fan. • 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 • Broken +24V fuse on PSU • Defective interlock switches
• Remedy: • Check or replace the harness. • Replace the fusing/paper exit motor. • Replace the +24V fuse on PSU. • Replace the interlock switches.

• 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: • Check if the heating roller thermopile is firmly connected. • Replace the heating roller thermopile.

• Code: 542
• Description: Heating roller warm-up error 1 • The heating roller temperature does not reach 80°C for 30 seconds. • The center temperature of the heating roller does not reach the ready temperature for 90 seconds.
• Causes: • Dirty or defective thermopile
• Remedy: • Check if the heating roller thermopile is firmly connected. • 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: Related SC code: SC 553 • Replace the PSU. • Replace the IPU. • 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: Related SC code: SC 543 • Replace the PSU. • Replace the IPU. • Replace the BCU.