KM 421

**CT Copier Repair** · 02-09-2012

Have a KM 421 that just sits at the boot screen
when i remove the board I get to the planet screen then it asks for serial numbers
how do I input
I saw a post here with a pdf but the pdf was corrupted
any help would be appreciated

thanks
Brian

**TheOwl** · 02-09-2012

Serial numbers are entered in from service mode.

Because your machine is having trouble booting up, you will need to go into trouble reset mode and from there you can enter in the key sequence to get into service mode.

The serial numbers are in System1 from memory.

If you replaced a board, then you will need to make sure that you have also done a firmware upgrade as well because new boards often don't come with firmware pre-loaded and if they do, it is usually alot older than the version that is currently on the machine.

**CT Copier Repair** · 02-09-2012

OK
so after i remove the NVRAm board and the machine boots
i enter the serial numbers from service mode

**RRodgers** · 02-09-2012

Originally Posted by CT Copier Repair

OK
so after i remove the NVRAm board and the machine boots
i enter the serial numbers from service mode

You pulled the NVram? Yeah, don't bother putting the serial number in as it won't have a place to store it too. I don't remember if there is a reset firmware for the NVram for this model or not. That would be the place I would start. Course, I'm a tech..... if I wasn't one I'd call one. I mean I'm pretty smart... but I'm smart enough to know when I'm in WAY over my head.