• Code: FA
• Description: The black drum unit is not installed.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: FB
• Description: The cyan drum unit is not installed.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: FC
• Description: The magenta drum unit is not installed.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: FD
• Description: The yellow drum unit is not installed.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: FE
• Description: Detection of incorrect measurement value of density sensor sensitivity calibration.
• Causes: 1 Harness connection failure of registration mark sensor holder ASSY. 2 Harness connection failure of shutter solenoid. 3 Registration mark sensor holder ASSY failure. 4 High-voltage power supply PCB failure. 5 Main PCB failure.
• Remedy: 1 Harness connection failure of registration mark sensor holder ASSY Check the harness connection of the registration mark sensor holder ASSY and reconnect it. 2 Harness connection failure of shutter solenoid Check the harness connection of the shutter solenoid and reconnect it. 3 Registration mark sensor holder ASSY failure Replace the registration mark sensor holder ASSY. 4 High-voltage power supply PCB failure Replace the high-voltage power supply PCB ASSY. 5 Main PCB failure Replace the main PCB ASSY

• Code: FF
• Description: Wireless LAN module overcurrent error.
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.