• Code: EC51 3103
• Description: USB Print bulk in bus error (support number : 6933)
• Causes: Bus error occurs at print bulk in end point.
• Remedy: 1 Check the cable connection and if the cable in use supports USB2.0. When connection is proper 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 3104
• Description: USB sub system firmware error (support number : 6940)
• Causes: USB firm error occurs.
• 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 3105
• Description: USB sub system command error (support number : 6941)
• Causes: USB command error occurs.
• Remedy: 1 Check the cable connection and if the cable in use supports USB2.0. When connection is proper 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 3106
• Description: Timeout error of USB sub system (support number : 6942)
• Causes: USB watch dog error occurs.
• 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 3107
• Description: USB sub system data copy error (support number : 6943)
• Causes: USB-Relax firmware data copy error occurs.
• 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 3108
• Description: USB sub system instruction error (support number : 6944)
• Causes: USB-Relax firm ware instruction copy error is occurs.
• 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 3109
• Description: USB sub system starting up error (support number : 6945)
• Causes: Boot error of USB-Relax firmware occurs.
• 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 3110
• Description: Timeout setting error of USB sub system (support number : 6946)
• Causes: Initial value set error of USB-Relax firmware watch dog occurs.
• 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.)