How do I find out what region my AES is

I have a Neo Geo AES with no power supply which I got several years back. Im now looking to replace the power supply but I dont have any of the original documents or box. So I was wondering how do I find out what region the system is?

look a t the back and there should bea power supply thing saying the voltage if it says 220 it is hong kong british and will work in the uk but anything else it is either jap or american i have a hong kong one and you can use a megadrive 1 power supply too make tehre be life in the system