Quote Originally Posted by FoxNtd View Post
I checked the FC adapter and the Genesis model 1 adapter since I have both. They're both outputting 10V DC but there is a difference. The FC adapter is marked 850mA but the Sega adapter shows 1200mA (1.2A). I wonder if the higher amperage is what is the cause for the excess heat building up. Maybe you should get the Japanese Nintendo adapter; it's the same part/adapter for both the FC and SFC (part number HVC-002).
Higher amperage doesn't matter, it will only take what it needs. It's more like the maximum amperage that the adapter can supply, systems won't always use as much current as the adapters list. The thing is while some Genesis Model 1 adapters output 10V, most seem to be rated 9V. They changed the adapters during production of the Model 1s, so his might be slightly underpowered to run the Famicom properly.