• Code: E733 0004
• Description: Error in printer communication (undefined command error)
• Remedy: 1) Turn OFF and then ON the power. 2) Replace the Engine Controller PCB.

• Code: E733 0006
• Description: Error in printer communication (unknown communication error)
• Remedy: 1) Turn OFF and then ON the power. 2) Replace the Engine Controller PCB.

• Code: E740 0002
• Description: An invalid MAC address has been detected.
• Remedy: 1) Check the Mac address. 2) Write the address to the Mac address. 3) Replace the board.

• Code: E740 0004
• Description: LAN Controller Chip access error
• Remedy: 1) Check around the LAN Chip. 2) Replace the board.

• Code: E744 0900
• Description: Model code mismatch
• Remedy: Change to proper bootable. Check the supported series or model of the firmware, and burn the correct series or model of firmware. Replace the Main Controller Board.

• Code: E744 1000
• Description: Mismatch of the series or model of the firmware sent at the time of downloading
• Remedy: Change to proper bootable. Check the supported series or model of the firmware, and burn the correct series or model of firmware. Replace the Main Controller Board.

• Code: E744 1100
• Description: Falsification of the Main Controller Board has been detected.
• Remedy: Change to proper bootable. Check the supported series or model of the firmware, and burn the correct series or model of firmware. Replace the Main Controller Board.

• Code: E748 2012
• Description: Failed to rewrite due to no more alternative block of Flash ROM (NAND) available.
• Remedy: Replace the Controller board.