• Code: C4
• Description: Tray 2 (LT) plate-up function malfunction
• Causes: 1 Connection failure between the machine and LT connector. 2 Harness connection failure of plate motor ASSY LT. 3 Harness connection failure of LT paper feed frame unit. 4 LT paper feed frame unit failure. 5 Engine PCB failure.
• Remedy: 1 Connection failure between the machine and LT connector Replace the connector. 2 Harness connection failure of plate motor ASSY LT Check the harness connection of the plate motor ASSY LT and reconnect it. 3 Harness connection failure of LT paper feed frame unit Check the harness connection of the LT paper feed frame unit and reconnect it. 4 LT paper feed frame unit failure Check the sensor performance following the procedure described in “Maintenance mode 32”. If any problem occurs, replace the LT paper feed frame unit. 5 Engine PCB failure Replace the engine PCB ASSY.

• Code: C5
• Description: EL lamp electrifying failure
• Causes: 1 Dirt on electrodes on drum unit and front cover. 2 EL lamp PCB failure. 3 EL lamp PCB harness broken. 4 Engine PCB failure.
• Remedy: 1 Dirt on electrodes on drum unit and front cover Clean both electrodes. 2 EL lamp PCB failure Replace the drum unit. 3 EL lamp PCB harness broken Replace the front door unit ASSY. 4 Engine PCB failure Replace the engine PCB ASSY.

• Code: C6
• Description: Toner cartridge mis-dividing
• Causes: 1 Harness connection failure of develop release motor. 2 Develop release sensor PCB failure. 3 Engine PCB failure.
• Remedy: 1 Harness connection failure of develop release motor Check the harness connection of the develop release motor and reconnect it. 2 Develop release sensor PCB failure Replace the develop release sensor PCB ASSY. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: C7
• Description: Insufficient DIMM memory
• Causes:
• Remedy:

• Code: C8
• Description: RAM area for secure data full
• Causes: 1 Main PCB failure
• Remedy: Replace the main PCB ASSY.

• Code: C9
• Description: Defective DIMM is installed.
• Causes:
• Remedy:

• Code: CA
• Description: Excess current to USB device
• Causes: 1 Harness connection failure of USB host relay PCB ASSY. 2 USB host relay PCB failure. 3 Main PCB failure.
• Remedy: 1 Harness connection failure of USB host relay PCB ASSY Check the harness connection of the USB host relay PCB ASSY and reconnect it. 2 USB host relay PCB failure Replace the USB host relay PCB ASSY. 3 Main PCB failure Replace the main PCB ASSY.

• Code: CB
• Description: Belt unit is not installed into the machine.
• Causes: 1 Harness connection failure of density sensor holder ASSY. 2 Density sensor failure. 3 Transfer HVPS PCB unit failure. 4 Engine PCB failure.
• Remedy: 1 Harness connection failure of density sensor holder ASSY Check the harness connection of the density sensor holder ASSY and reconnect it. 2 Density sensor failure Replace the density sensor holder ASSY. 3 Transfer HVPS PCB unit failure Replace the transfer HVPS PCB unit. 4 Engine PCB failure Replace the engine PCB ASSY.