Kyocera TaskAlfa 3501i A3/A4 Mono BW Laser Multifunction Printer - 35ppm, Print, Copy, Scan, Auto Duplexing, Network, 2 Trays, Stand, real name.
what makes you can think changing boards around like that can work at all (like in the 1980s or before)
most things now must be reprogrammed to do that
not reading the service manual first is why you fail, !!! sorry but yes.
it will in fact
tell you how to replace parts .
facts.
ask Kyocera for books and parts. 2013 made I think. 9 years old.
users ,manual is here but is not for repairs ever.
https://www.manualslib.com/manual/550809/Kyocera-Taskalfa-3501i.html#
their real web site has only 3510i support now. and no service manuals there, my guess , ether not sold or not allowed
only their service centers get them.
but gee ask them direct.
i see only this
https://www.kyoceradocumentsolutions.us/en/about-us/contact-us/other-support.html
ask them for , direct support or ask for a service manual.
GUE$$ing mostly fails and is expensive.