• Code: EC51 3000
• Description: Net work sub system starting up error (support number : 6900)
• Causes: Starting up sequence of Network sub system is failed.
• Remedy: 1 Reboot. The problem is resolved Complete. The problem is not resolved Reinstall the firmware.

• Code: EC51 3001
• Description: Timeout error of network sub system (support number : 6901)
• Causes: Network sub system does not switch to ON (alive).
• Remedy: 1 Reboot. The problem is resolved Complete. The problem is not resolved Reinstall the firmware.

• Code: EC51 3004
• Description: Wired LAN driver error (support number : 6920)
• Causes: The fatal error occurs in the ethernet driver.
• Remedy: 1 Reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 3005
• Description: Wired LAN hardware error (support number : 6921)
• Causes: Ethernet driver is physically broken.
• Remedy: 1 Check the connection of the I/F PCB UNIT and the MAIN PCB UNIT. The problem is resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.) The problem is not resolved Connect the I/F PCB UNIT to the MAIN PCB UNIT.

• Code: EC51 3006
• Description: Other network sub system error (support number : 6902)
• Causes: Starting up sequence of network sub system fails.
• Remedy: 1 Reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 3100
• Description: USB control out bus error (support number : 6930)
• Causes: Bus error occurs at USB control out end point occurs.
• Remedy: 1 Check the cable connection and if the cable in use supports USB2.0. When proper connection and USB2.0 is supported, reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 3101
• Description: USB control in bus error (support number : 6931)
• Causes: USB control in end point bus error occurs
• Remedy: 1 Check the cable connection and if the cable in use supports USB2.0. When proper connection and USB2.0 is supported, reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)

• Code: EC51 3102
• Description: USB Print bulk out bus error (support number : 6932)
• Causes: Bus error occurs at print bulk out end point
• Remedy: 1 Check the cable connection and if the cable in use supports USB2.0. When proper connection and USB2.0 is supported, reinstall the firmware. The problem is resolved Complete. The problem is not resolved Replace the MAIN PCB UNIT. (After replacement, perform PCB replacement mode and necessary adjustments.)