Description: Version mismatch between BOOTABLE and BOOTROM
Causes: A version mismatch between the main program and the start-up program.
Remedy: 1. Update the firmware.
Code: E744-4000
Description: Invalid engine connection error
Causes: It was detected that an invalid engine was connected.
Remedy: 1. Check whether a proper Engine Controller PCB (UN1) is installed. 2. Update the firmware. 3. Replace the Engine Controller PCB (UN1).
Code: E744-5000
Description: Communication error between Control Panel PCB and 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).
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 harness/connector between the Wireless LAN PCB (UN35) and the Main Controller PCB (UN30). 3. Install the set of controller firmware. 4. Replace the Wireless LAN PCB (UN35). 5. Replace the Main Controller PCB (UN30).
Code: E744-7000
Description: Backup microcomputer error
Causes: An error in the microcomputer that retains fax job information of the Main Controller PCB.
Remedy: 1. Update the firmware. 2. Replace the Main Controller PCB (UN30).
Code: E746-0000
Description: Main Controller PCB error (others)
Causes: A communication error with the Main Controller PCB occurred (other than scan-related communication error).
Remedy: 1. Update the firmware. 2. Replace the Main Controller PCB (UN30).