• Code: E744 0002
• Description: Language file size error
• Causes: The size of the language file exceeded the upper limit.
• Remedy: Install the set of the controller firmware.

• Code: E744 1001
• Description: Firmware version error
• Causes: Versions of the main program and the start-up program were not matched.
• Remedy: Install the set of the controller firmware.

• Code: E744 4000
• Description: Engine ID error
• Causes: Invalid engine connection was detected.
• Remedy: 1. Turn OFF and then ON the main power. 2. Check the DC Controller PCB. 3. Install the DC Controller PCB. 4. Install the set of the controller firmware. 5. Check the model code. (When the model code and the engine code are mismatched, E744-4000 occurs.)

• Code: E744 5000
• Description: Error in the Control Panel PCB
• Causes: Error in the Control Panel PCB (microcomputer)
• Remedy: 1. Check the Control Panel PCB, and install the firmware (PANEL). 2. Install the set of the controller firmware. 3. Replace the Main Controller PCB.

• Code: E744 6000
• Description: Communication error with Wireless LAN PCB
• Causes: Communication with the Wireless LAN PCB could not be established.
• Remedy: 1. Turn OFF and then ON the main power. 2. Check the connection of the Wireless LAN PCB. 3. Install the set of the controller firmware. 4. Replace the Main Controller PCB.

• Code: E744 7000
• Description: Main Controller PCB error
• Causes: An error in the microcomputer which retains fax job information of the Main Controller PCB
• Remedy: 1. Install the firmware of BKUP. 2. Install the set of the controller firmware. 3. Replace the Main Controller PCB.

• Code: E746 0000
• Description: Main Controller PCB error
• Causes: Main Controller communication error occurred (other than scan).
• Remedy: 1. Install the set of the controller firmware. 2. Replace the Main Controller PCB.

• Code: E766 8000
• Description: Firmware error
• Causes: Information at color displacement correction could not be obtained.
• Remedy: 1. Install the DC Controller firmware. 2. Install the set of the controller firmware. 3. Replace the DC Controller PCB.