Causes: An error occurred in ROM for backing up fax data.
Remedy: 1. Check the connection of the NCU PCB (UN38). 2. Replace the NCU PCB (UN38). 3. Replace the Main Controller PCB (UN30).
Code: E743-0000
Description: DDI communication error
Causes: Software sequence error
Remedy: 1. Turn OFF and then ON the power.
Code: E744-0001
Description: Incorrect combination of language file versions
Causes: Language file version did not match that of the main program.
Remedy: 1. Update the firmware
Code: E744-0002
Description: Language file error
Causes: The size of the language file exceeded the allowed size.
Remedy: 1. Update the firmware.
Code: E744-4000
Description: Invalid engine connection error
Causes: Invalid engine connection was detected.
Remedy: 1. Check if the valid Engine Controller PCB (UN1) is installed. 2. Update the firmware. 3. Replace the Engine Controller PCB (UN1).
Code: E744-5000
Description: Communication error between the Controller PCB and the Main Controller PCB
Causes: Communication with the Control Panel PCB could not be established.
Remedy: 1. Check the harness/connector between the Panel PCB (UN31) and the Main Controller PCB (UN30). 2. Replace the Control Panel (including the Panel PCB(UN31)). 3. Replace the Main Controller PCB (UN30).