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correct way to ground this
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kenzo42:
hey everyone,

i have a jamma cab and it only has 2 prongs. the back of the cab has a ground screw. however, i am using a 2 prong step down converter that has 3 prong outputs.

is the step down converter not really grounded since its power plug is only 2 prong? what are my options?

thanks
JoyMonkey:
Take a look at this diagram I threw together in the Arcade Misc forum, it's not exactly your setup, but has some relevance.



As far as I can tell, you should run a heavy wire from the ground prong on your new plug to your monitor, metal control panel and the inside of the coin door.
kenzo42:
what if my step down converter, which my cab is plugged into,  doesn't have an earth ground though? will my cab still be grounded if i do it your method?
cholin:
I dont quite get it, but theres two types of "ground".  Theres the negative current, called a ground, and theres an earth ground.  On a two prong plug, you get + and -.  So the screw at the back of your cabinet should lead to an earth ground.  I dont know about transformers, but anything that is plugged in with two prongs is not earth-grounded.

I just got it.  The step down converter is probably not earth grounded, since it only uses 2 prongs.  You probably have to put a ground wire to it.
flyguy1821:
I am confused.  How many prongs are on your transformer? 
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