The one thing that always bothered me about Jakks Pacific Plug and Plays is that you can't use a power supply on the units. This is the Plug and Play I have:
Jakks Pacific's first(at least what I presume is the first) Namco Plug and Play. I have added a 6V power supply input wired up for power supplies with center negative polarity, and while it works, there's something wrong and I can't figure it out. The problem is that I get thick white horizontal lines on the screen that scroll from top to bottom. Now, usually, this is a grounding issue, and I've experienced this with a Super Joy III Famicom-in-a-Nintendo-64-controller thing, but unlike the Super Joy III, the Namco Plug and Play just WILL NOT WORK without those stupid horizontal lines. And it only occurs when I have a power supply plugged in. With batteries, there are no lines. So what's the problem? Why am I getting those vertical lines?
By the way, the power supply in question is one of those multi-voltage power supplies with switchable polarity. I have it set to DC 6V with center negative. Power supply is capable of 300mA, and what I don't get is that it works perfectly fine on my Radica Genesis Plug and Plays, but on my Jakks Pacific Namco Plug and Play, there are 2 thick white horizontal bars that scroll down the screen.
Now, Jakks Pacific sells a power supply you can put into the battery compartment to power their Plug and Plays: http://www.amazon.com/Jakks-Pacific-.../dp/B000809OUO
But if you look at the product description where it says "from the manufacturer:", it reads: "For use with all TV Games brand controllers. Input 120V AC, Output 8V DC, Ideal to be used with DC 6V power consumption device."
So what does this mean? Am I undervolting the system by setting my power supply to 6V? Jakks Pacific uses an 8V power supply, and when I lower the voltage on my power supply, the lines become even more visible. I don't trust feeding anything greater than 6V into my Namco Plug and Play, so tell me, what's the problem? A grounding issue or voltage problems? What I really don't get is why this only occurs with a power supply and not with batteries. 4 AA batteries provide 6V, so why doesn't my power supply work right on the damn thing?
EDIT: Apparently, the 8V thing is a mistake. The power supply outputs 6V according to the package of the power supply. It even has a max current rating of 200mA. So all I have to say now is WTF?