with out looking at one right now im not sure, but often there is a switch on th back of the power supply that alows you to select 115 or 220 volt. Not sure tha amiga 3000 had that. Otherwise you have two options
1 get a new 220 3000 power supply
2, get a stepdown converter, a big box that converts the 220 volt 60hrz to 120 50hrz.
It's realy importatnt the the converter you use also steps down the hrz otherwise you will blow the thing up. Do NOT use one of those univeral traveling converters made for shavers.
