>Shipping the whole slot back here probably doesn't
>make much sense. Failure do not seem to be specific
>to the same cabinet over and over but instead
>across a bunch of cabinets.
>
>In this case they are accommodating but so far I
>haven't proven anything about what could cause the
>failures.  If I can't reproduce the problem
>it's a lot harder to fix.

Does seem to be the symptoms of mains interference. Doe sit happen when the
cleaning crew plug the vacuum in? Is there some other electrical appliance
nearby?

I suspect the only way to fix the problem is to go through all machines on a
rolling basis installing shielding and grounding within the machine. You
will probably need some suitable noise generators in the workshop to
ascertain the noise sensitive points.

A handful of vacuum cleaner units with universal motors and suitable arcing
brushes would probably do the trick.

You may need to go through a specimen cabinet and look at how the mains
filtering is done, how the various bits are linked together to an earth
bonding point - do the casinos even provide any sort of earthing for the
cabinet (I am thinking here that you are in 2 pin 110V territory, so maybe
unit not earthed)? If you can reproduce the apparent problem in the W/S then
you probably have a pretty good handle on sorting it out.

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