Krell KPS25s 110V to 220V how?

Hi all,
I change the position of the input switchs and they unit power on and read frecuency error, so..... I pulled the eprom AM 27C010-120DC 5B and in the next day fix the 60hz .
Any one know if the eprom or the program is the same that Krell use in the Krell 400 integrated amp?
Anyone have the program?
Thanks!
Rubén