• Code: 520
• Description: 2nd paper tray cooling fan error (optional paper feed unit). The motor lock signal error from the cooling fan is detected for 10 seconds after turning on the cooling fan.
• Causes: • Disconnected harness of the cooling fan • Defective cooling fan • Defective BCU
• Remedy: 1. Check or replace the harness of the cooling fan. 2. Replace the cooling fan. 3. Replace the BCU.

• Code: 521
• Description: 3rd paper tray cooling fan error (optional paper feed unit). The motor lock signal error from the cooling fan is detected for 10 seconds after turning on the cooling fan.
• Causes: • Disconnected harness of the cooling fan • Defective cooling fan • Defective BCU
• Remedy: 1. Check or replace the harness of the cooling fan. 2. Replace the cooling fan. 3. Replace the BCU.

• Code: 522
• Description: 4th paper tray cooling fan error (optional paper feed unit). The motor lock signal error from the cooling fan is detected for 10 seconds after turning on the cooling fan.
• Causes: • Disconnected harness of the cooling fan • Defective cooling fan • Defective BCU
• Remedy: 1. Check or replace the harness of the cooling fan. 2. Replace the cooling fan. 3. Replace the BCU.

• Code: 530
• Description: Development fan 1 error. The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective development fan 1 or development fan 2 • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the development fan 1 (SC530) or development fan 2 (SC531). 3. Replace the BCU.

• Code: 531
• Description: Development fan 2 error. The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective development fan 1 or development fan 2 • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the development fan 1 (SC530) or development fan 2 (SC531). 3. Replace the BCU.

• Code: 532
• Description: Laser unit fan error The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective laser unit fan • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the laser unit fan. 3. Replace the BCU.

• Code: 533
• Description: Fusing fan 2 error The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective fusing fan 2 • Disconnected or defective harness • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the fusing fan 2. 3. Replace the BCU.

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