• Code: 7702
• Description: When printing from the paper tray 5, the registration front sensor or the T2/T3/T4/T5TT jam sensor does not detect paper pass within the specified time after the T5TT paper feed sensor detected paper pass.
• Remedy: • Remove the jammed paper. • Add the paper properly using the paper tray 5 paper guide. • Install the latest main firmware.
  1 Foreign object in the front of the machine Remove the foreign object. 2 Registration front actuator attachment failure Reattach the registration front actuator. 3 T2/T3/T4/T5TT jam sensor attachment failure Reattach the T2/T3/T4/T5TT jam sensor. 4 Connection failure of the registration front/rear sensor harness Reconnect the registration front/rear sensor harness. 5 Connection failure of the T2/T3/ T4/T5TT jam sensor harness Reconnect the T2/T3/T4/T5TT jam sensor harness. 6 Connection failure of the TT control PCB harness Reconnect the TT control PCB harness. 7 Connection failure of the T3/T4/ T5TT release clutch harness Reconnect the T3/T4/T5TT release clutch harness. 8 T3/T4/T5TT release clutch failure Replace the T3/T4/T5TT release clutch. 9 Registration front/rear sensor PCB failure Replace the registration front/rear sensor PCB ASSY. 10 T2/T3/T4/T5TT jam sensor PCB failure Replace the T2/T3/T4/T5TT jam sensor PCB ASSY. 11 TT control PCB failure Replace the TT control PCB ASSY. 12 high-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 13 Damaged gears in the TT paper feeding system Replace the TT. 14 Main PCB failure Replace the main PCB ASSY.

• Code: 7800
• Description: The registration front sensor does not detect paper pass within the specified time after the first side was printed in duplex printing mode.
• Remedy: • Remove the jammed paper. • Close the back cover correctly. • Attach the duplex tray correctly.
  1 Foreign object in the rear of the machine or duplex tray Remove the foreign object. 2 Connection failure of the eject motor harness Reconnect the eject motor harness. 3 Duplex tray failure Replace the duplex tray. 4 Eject motor failure Replace the eject motor. 5 Damaged gears in the paper feeding system Replace the main frame L ASSY. 6 Paper eject roller failure Replace the paper eject roller. 7 Main PCB failure Replace the main PCB ASSY.

• Code: 8501
• Description: When printing from paper tray 1 to 5, the T1 paper feed sensor detected open paper tray 1 (before registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed actuator coming off or caught in some sections of the machine Reattach the appropriate LT/TT paper feed actuator. 3 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 6 TT relay PCB failure Replace a TT relay PCB ASSY. 7 TT control PCB failure Replace the TT control PCB ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 8502
• Description: When printing from paper tray 2 to 5, the T2(LT or TT) paper feed sensor detected open paper tray 2 (before registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed actuator coming off or caught in some sections of the machine Reattach the appropriate LT/TT paper feed actuator. 3 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 6 TT relay PCB failure Replace a TT relay PCB ASSY. 7 TT control PCB failure Replace the TT control PCB ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 8503
• Description: When printing from paper tray 3 to 5, the T3(LT or TT) paper feed sensor detected open paper tray 3 (before registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed actuator coming off or caught in some sections of the machine Reattach the appropriate LT/TT paper feed actuator. 3 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 6 TT relay PCB failure Replace a TT relay PCB ASSY. 7 TT control PCB failure Replace the TT control PCB ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 8504
• Description: When printing from paper tray 4 to 5, the T4(LT or TT) paper feed sensor detected open paper tray 4 (before registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed actuator coming off or caught in some sections of the machine Reattach the appropriate LT/TT paper feed actuator. 3 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 6 TT relay PCB failure Replace a TT relay PCB ASSY. 7 TT control PCB failure Replace the TT control PCB ASSY. 8 Main PCB failure Replace the main PCB ASSY.

• Code: 8505
• Description: When printing from paper tray 1 to 5, the T1 paper feed sensor detected open paper tray 1 (after registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 3 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 4 TT relay PCB failure Replace a TT relay PCB ASSY. 5 TT control PCB failure Replace the TT control PCB ASSY. 6 Main PCB failure Replace the main PCB ASSY.

• Code: 8506
• Description: When printing from paper tray 2 to 5, the T2(LT or TT) paper feed sensor detected open paper tray 2 (after registering printing data to engine).
• Remedy: • Close the appropriate paper tray correctly. 1 Malfunction of an LT control PCB or TT control PCB Install the latest main firmware. 2 An LT/TT paper feed sensor failure Replace the appropriate LT/TT paper feed sensor PCB ASSY. 3 An LT control PCB failure Replace the appropriate LT control PCB ASSY. 4 TT relay PCB failure Replace a TT relay PCB ASSY. 5 TT control PCB failure Replace the TT control PCB ASSY. 6 Main PCB failure Replace the main PCB ASSY.