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Hey all, I've got a "problem" that I'm not sure exists, but I'll throw it out there to those who know more than me. I've been having issues with my dozer blade randomly going up and down during game play, but tests 100%, and plays 100% when required. I've reflowed the solder several times, and while it has improved, the random movement still happens occasionally.

So, I decided to order the replacement opto board (product RS-BOB) from Great Lakes Modular

http://www.greatlakesmodular.com/

However, when installed, their board causes my F104 fuse to blow, which disables solenoids #1-8 (though the manual has an error that says it should disable #9-14). I repeated the blowing of the fuse 3 times over by repeatedly switching out my OEM board, and the fuse, with the RS-BOB, and every time, the RS-BOB caused F104 to blow.

I contacted Tony at GLM and he informed me that since the opto board doesn't receive 50v that the problem must be a short somewhere else, maybe in a wiring harness, that must be getting grounded by the mounting holes on the RS-BOB which are grounded, unlike the original opto board where the holes aren't grounded (which is why I don't have the fuse blowing with the OEM opto board).

Does this sound like something anyone has heard of before?

I've examined my machine and can't find anything visually that could be wrong, and the entire machine tests and functions 100% except for the occasional random raising of the dozer blade during game play.

But, could a 50v short be causing the dozer issue?

Anyways, I can always return it for a refund, Tony has been great to deal with. But, if there's an issue in my machine, then I'd rather fix the issue and keep the RS-BOB.

Any suggestions on where to look for the problem, or if any of this even makes sense?
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