Todd's version of the ground update is frankly, a minimal approach. There's a lot more you should be doing besides adding two wires to the CPU to Driver board connector. Ground mods on gottlieb's is a huge deal, and he just takes the short cut.

On the sys80b power supply, do not spray the 5 volt adjustment pot. REPLACE the damn thing! it's like 50 cents (500 ohm pot). He's on the right track (in that this pot is failure prone), but it needs replacement, not sprayed with some chemical.

I'm sorry Todd but your approach is minimal at best. The whole reason for the ground mods is because the edge connectors just can't be trusted. Where other manufacturers had "hard" grounds (boards screwed to a metal back plane, which was ground), Gottlieb relied on connectors to do this.

The whole point of this is to make sure the grounds are SOLID. That is, they don't float (because of crappy connectors.)

Let me put it this way... If you drive a car into a ditch, is driving another car into the ditch making things better??? Because that's your version of the "ground fix", where you rely on the same crappy connectors (new or not) to do that job!

Another way to put this... Doing the same thing again and again and expecting different results, well, that's the definition of "insane."

And to add to that, you're using USED parts in the version of the ground mod you do? Seriously????

What i don't understand Todd, is why are you so lazy on this issue? it takes me about 15 minutes to do ALL the ground mods. ALL of them (including adding the interconnector wires you do.) This is one of those things where's you really can't do too much. Running hard (wires) grounds to the boards is the best way to handle this. Relying on the same crappy connectors (and used ones in your case!) that failed before is just, well, lazy and dumb.