Originally Posted by
Gameguy
You just mentioned how you needed to set it at 12V because it wasn't working with 9V, though the system is meant to use 9V. That's because there isn't enough amperage. I had the same problem with a Model 1 Genesis, I bought a bundle locally and it just came with a universal adapter rated 300mA. It had similar problems that you're describing and needed to be set at 12V to work, and I noticed the adapter got super hot during use. I bought a proper Sega adapter and the system worked fine without any more video or sound problems. The systems are rated at 850mA but the proper adapters are usually capable of 1.2A, I guess they wanted to be sure that there wouldn't be any problems in case the system needed more power for some reason.