Hello fellow techs! Jumped into my Service Manual today for an error code on Xerox 7845 machine I'm working on, and I don't see the usual area that lists errors codes. Just a bunch of RAPs.

Can someone please help me with the following error code? 04-565-00 - Client's machine starts initial boot, the doc feed moves, then nothing except flashing lights on control panel and that is 4 quick blinks, and then stops, then 4 blinks repeating. Panel never lights up and the rest of bootup sequence doesn't do anything.

On the back controller's LED display the three letters say E...F...B

Thanks in advance for any help you might provide.

I suspect Main control board, but need verification.

Weird part is, I can still pull up GUI interface on computer browser. Here's that code under description and alerts.