• Code: 504
• Description: Tray 4 error (Paper Feed Unit or LCT)
  This SC is generated if the following condition occurs. For the two-tray paper feed unit When the tray lift motor is turned on, the upper limit is not detected within 15 seconds. For the LCT If the upper or lower limit is not detected within 8 seconds when the tray lift motor is turned on to lift up or lower the tray. This SC is generated too if the following condition occurs 3 consecutive times. For the two-tray paper feed unit When the tray lowers, the tray lift sensor does not go off within 1.5 sec. For the LCT If the upper limit does not go off for 1.5 seconds even the tray lift motor turns on to lower the tray after the upper limit has been detected at power on.
• Causes: For the two-tray paper feed unit: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection For the LCT: • Defective stack transport clutch or connector disconnection • Defective tray motor or connector disconnection • Defective end fence home position sensor or connector disconnection • Defective upper limit sensor or connector disconnection • Defective tray lift motor or connector disconnection
• Remedy: 1. Check the cable connections. 2. Check and/or replace the defective component.

• Code: 505
• Description: Tray 5 error (Optional Paper Feed Unit or LCT)
  This SC is generated if the following condition occurs. For the two-tray paper feed unit When the tray lift motor is turned on, the upper limit is not detected within 15 seconds. For the LCT 1200-sheet If the upper or lower limit is not detected within 8 seconds when the tray lift motor is turned on to lift up or lower the tray. This SC is generated too if the following condition occurs 3 consecutive times. For the two-tray paper feed unit When the tray lowers, the tray lift sensor does not go off within 1.5 sec. For the LCT 1200-sheet If the upper limit does not go off for 1.5 seconds even the tray lift motor turns on to lower the tray after the upper limit has been detected at power on.#a
• Causes: • Defective tray lift motor or connector disconnection • Defective lift sensor or connector disconnection
• Remedy: 1. Turn the power switch off and on.

• Code: 520-01
• Description: Registration motor error
  The IOB does not receive the lock signal.
• Causes: • Motor overload • Defective registration motor • Disconnected or broken harness • Defective IOB
• Remedy: 1. Check the cable connection. 2. Replace the harness. 3. Replace the registration motor. 4. Replace the IOB.

• Code: 520-02
• Description: Paper feed motor error
  The IOB does not receive the lock signal.
• Causes: • Motor overload • Defective registration motor • Disconnected or broken harness • Defective IOB
• Remedy: 1. Check the cable connection. 2. Replace the harness. 3. Replace the registration motor. 4. Replace the IOB.

• Code: 530
• Description: Fusing fan error
  The IOB does not receive the lock signal 100 ms after turning on the fusing fan.
• Causes: • Defective fusing fan motor or connector disconnection • Defective IOB
• Remedy: 1. Check the connector and/or replace the fusing fan motor.

• Code: 531
• Description: QSU fan error
  The machine does not detect the fan motor lock signal for 100 ms while the QSU fan turns on.
• Causes: • Disconnected harness • Overload on the QSU fan motor • Defective QSU fan motor • Defective IOB
• Remedy: 1. Check or replace the harness. 2. Replace the QSU fan. 3. Replace the IOB.

• Code: 532-01
• Description: Ventilation fan (at the left side of the machine) motor error: front end
  The IOB does not receive the lock signal for 100 ms after turning on the ventilation fan motor in the front end or rear end.
• Causes: • Defective ventilation fan motor in the front end or rear end • Defective IOB
• Remedy: 1. Replace the ventilation fan (at the left side of the machine) motor in the front end or rear end. 2. Replace the IOB.

• Code: 532-02
• Description: Ventilation fan (at the left side of the machine) motor error: rear end
  The IOB does not receive the lock signal for 100 ms after turning on the ventilation fan motor in the front end or rear end.
• Causes: • Defective ventilation fan motor in the front end or rear end • Defective IOB
• Remedy: 1. Replace the ventilation fan (at the left side of the machine) motor in the front end or rear end. 2. Replace the IOB.