• Code: 8507
• Description: When printing from paper tray 3 to 5, the T3(LT or TT) paper feed sensor detected open paper tray 3 (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: 8508
• Description: When printing from paper tray 4 to 5, the T4(LT or TT) paper feed sensor detected open paper tray 4 (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: 8702
• Description: Machine stack sensor detected the ejected paper full state at the start of printing.
• Remedy: • Remove the paper from the machine output tray. 1 Machine stack actuator coming off or caught in some sections of the machine Reattach the machine stack actuator. 2 Machine stack sensor failure Replace the machine stack sensor. 3 Main PCB failure Replace the main PCB ASSY.

• Code: 8903
• Description: The back cover/duplex tray sensor detected that the cover was open when duplex printing is started. (Before registering printing data to engine)
• Remedy: • Close the back cover correctly. • Attach the duplex tray correctly.
  1 Back cover/duplex tray sensor attachment failure Reattach the back cover/duplex tray sensor. 2 Connection failure of the back cover/duplex tray sensor harness Reconnect the back cover/duplex tray sensor harness. 3 Damaged back cover Replace the back cover. 4 Damaged duplex tray Replace the duplex tray. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 8904
• Description: The back cover/duplex tray sensor detected that the cover was open during duplex printing. (After registering printing data to engine)
• Remedy: • Close the back cover correctly. • Attach the duplex tray correctly.
  1 Back cover/duplex tray sensor attachment failure Reattach the back cover/duplex tray sensor. 2 Connection failure of the back cover/duplex tray sensor harness Reconnect the back cover/duplex tray sensor harness. 3 Damaged back cover Replace the back cover. 4 Damaged duplex tray Replace the duplex tray. 5 Main PCB failure Replace the main PCB ASSY.

• Code: 8A01
• Description: The registration rear sensor detected that the paper fed was smaller or larger than the specified size in duplex printing mode.
• Remedy: • Use specified paper. 1 Registration rear actuator caught in some sections of the machine Reattach the registration rear actuator. 2 Registration rear sensor failure Replace the registration front/rear sensor PCB ASSY. 3 high-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 4 Main PCB failure Replace the main PCB ASSY.

• Code: 8B01
• Description: Detected that the TT was not turned ON.
• Remedy: • Turn ON the TT. • Reconnect the AC cord of the TT.
  1 Malfunction of the TT control PCB Install the latest main firmware. 2 Connection failure of the TT lowvoltage power supply PCB harness Reconnect the TT low-voltage power supply PCB harness. 3 TT AC cord breakage Replace the AC cord. 4 TT low-voltage power supply PCB failure Replace the TT low-voltage power supply PCB ASSY. 5 TT control PCB failure Replace the TT control PCB ASSY. 6 Main PCB failure Replace the main PCB ASSY.

• Code: 8E02
• Description: Detected that the size of the paper set to paper tray was over 10 mm shorter than letter size when receiving fax or printing a list/report.
• Remedy: • Set A4 or Letter-size paper. 1 Registration rear actuator caught in some sections of the machine Reattach the registration rear actuator. 2 Registration rear sensor failure Replace the registration front/rear sensor PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.