mpc3501 after firmware failure will not boot up

[kannuki2]

Re: mpc3501 after firmware failure will not boot up

After you receive the error enter in service menu
Backup your adressbook if you need it and give it a memory clear
Try to clear all with
5801-001
or
5801-003 this one initializes default system settings, SCS (System ControlService) settings, operation display coordinates, and ROM
update information.

The question is how can he gets into service mode when it hangs at the 'please wait'? I would suggest unplug the adf and finisher option. Hold down the * button and # button at the same time then turn on the machine. Hopefully this will save you some part. If it does not work, I would try new controller, nvram, and perhaps bicu. What is the firmware part number for adf and network you upgraded?