• Code: 508
• Description: By-pass bottom plate error
  The signal from the by-pass tray HP sensor does not change for 1.0 second after the by-pass motor has rotated counterclockwise. If this condition occurs three consecutive times, the SC is generated.
• Causes: • Disconnect or defective harness of the by-pass motor • Defective or disconnected connection for the by-pass motor. • Defective by-pass motor • Disconnect or defective harness of the by-pass HP sensor • Defective or disconnected connection for the by-pass HP sensor. • Defective by-pass HP sensor
• Remedy: Check the operation of the by-pass motor with SP5804-023. No operation: 1. Check the harness connection of the by-pass tray and duplex unit. 2. Replace the by-pass motor. Operation: Check the operation of the by-pass HP sensor with SP5803-048 while the by-pass motor is rotating. No change of Bit 0 1. Check the harness connection of the by-pass HP sensor. 2. Replace the by-pass HP sensor.

• Code: 530
• Description: Ventilation fan: front error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective ventilation fan: front or rear • Disconnected or defective harness • Defective DRB • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the ventilation fan: front (SC530) or rear (SC531). 3. Replace the DRB. 4. Replace the BCU.

• Code: 531
• Description: Ventilation fan: rear error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective ventilation fan: front or rear • Disconnected or defective harness • Defective DRB • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the ventilation fan: front (SC530) or rear (SC531). 3. Replace the DRB. 4. 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 drive board • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the laser unit fan. Replace the laser unit fan motor. 1. Replace the DRB. 2. Replace the BCU.

• Code: 533
• Description: Fusing front fan error
  The motor lock signal error is detected for 10 seconds after the motor lock signal was first detected.
• Causes: • Defective fusing front fan • Disconnected or defective harness • Defective DRB • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the fusing front fan. 3. Replace the DRB. 4. Replace the BCU.

• 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 DRB • Defective BCU
• Remedy: 1. Check or replace the harness. 2. Replace the fusing rear fan. 3. Replace the DRB. 4. Replace the BCU.

• 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: 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.