• Code: 5100
• Description: Printable pages set for the MP paper feeding kit have reached the limit. (Printing does not stop.)
• Causes: 1 End of life of the fuser unit. 2 Main PCB failure.
• Remedy: 1 Abrasion of the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2 Replace the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 5200
• Description: Printable pages set for paper feeding kit 1 have reached the limit. (Printing does not stop.)
• Causes: 1 End of life of the fuser unit. 2 Main PCB failure.
• Remedy: 1 Abrasion of the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2 Replace the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 5300
• Description: Printable pages set for paper feeding kit 2 have reached the limit. (Printing does not stop.)
• Causes: 1 End of life of the fuser unit. 2 Main PCB failure.
• Remedy: 1 Abrasion of the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2 Replace the MP paper feeding kit, paper feeding kit 1 or paper feeding kit 2. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 5400
• Description: Printable pages set for the fuser unit have reached the limit. (Printing does not stop.)
• Causes: 1 End of life of the fuser unit. 2 Main PCB failure.
• Remedy: 1 End of life of the fuser unit Replace the fuser unit. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 5500
• Description: Printable pages set for the laser unit have reached the limit. (Printing does not stop.)
• Causes: 1 End of life of the laser unit. 2 Main PCB failure.
• Remedy: 1 End of life of the laser unit Replace the laser unit. 2 Main PCB failure Replace the main PCB ASSY.

• Code: 5600
• Description: The eject sensor detected that the fuser cover was open.
• Causes: 1 Eject actuator attachment failure. 2 Eject actuator spring attachment failure. 3 Eject actuator and/or fuser cover failure. 4 Eject sensor PCB failure. 5 Main PCB failure.
• Remedy: 1 Eject actuator attachment failure Reattach the eject actuator. 2 Eject actuator spring attachment failure Reattach the eject actuator spring. 3 Eject actuator and/or fuser cover failure Replace the fuser cover. 4 Eject sensor PCB failure Refer to "1.3.10 Check sensor operation (function code: 32)" in Chapter 5 to check the sensor operation. If the sensor operation is faulty, replace the eject sensor PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 5700
• Description: The registration front sensor does not detect paper pass within the specified time after the first side was printed in duplex printing mode.
• Causes: 1 Foreign object in the duplex paper feed system. 2 Outer chute coming off. 3 Connection failure of the duplex solenoid harness. 4 Duplex gears attachment failure. 5 Duplex tray failure. 6 Duplex solenoid failure. 7 Damaged duplex gears. 8 Main PCB failure.
• Remedy: 1 Foreign object in the duplex paper feed system Remove the foreign object. 2 Outer chute coming off Reattach the outer chute. 3 Connection failure of the duplex solenoid harness Check the connection of the duplex solenoid harness, and reconnect it if necessary. 4 Duplex gears attachment failure Reattach the duplex gears. 5 Duplex tray failure Replace the duplex tray. 6 Duplex solenoid failure Replace the duplex solenoid. 7 Damaged duplex gears Replace the main frame L ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 5800
• Description: Any of error codes 6A00 to 6F00, 7600, 7800, DD00,DE00, or E200 (fuser unit error) occurred when the power switch was turned ON or sleep mode was released.
• Causes: 1 Connection failure of the fuser unit harnesses. 2 Connection failure of the eject sensor PCB harness. 3 Fuser unit failure. 4 Eject sensor PCB failure. 5 Low-voltage power supply PCB failure. 6 Main PCB failure.
• Remedy: 1 Connection failure of the fuser unit harnesses Check the connection of fuser unit harnesses, and reconnect them if necessary. 2 Connection failure of the eject sensor PCB harness Check the connection of the eject sensor PCB harness, and reconnect it if necessary. 3 Fuser unit failure Replace the fuser unit. 4 Eject sensor PCB failure Refer to "1.3.10 Check sensor operation (function code: 32)" in Chapter 5 to check the sensor operation. If the sensor operation is faulty, replace the eject sensor PCB ASSY. 5 Low-voltage power supply PCB failure Replace the low-voltage power supply PCB ASSY. 6 Main PCB failure Replace the main PCB ASSY.