Hi,
ive recently bought a 2003 Beast Sapp Pachislo, it currently has a 2 pin Japanese Plug and a green wire coming out of the back which I presume is an earth wire. The black sticker panel at the top of the machine has Japanese language and then has 110w and 2A bellow it.

From what I’ve described can anyone tell me if I require a step down converter to run on a UK 240v, and also where the green wire is supposed to go?