GRJ, thanks for your analysis. I agree with you that 1) this is not rocket science (there is only 1 external two wire connection to the PCB), and 2) it's hard to believe all the boards are bad. However, I am testing all the boards with the powered units from my 6-34513 and 31772 sets. Both have working smoke units. When I plug the new (just returned) smoke unit into those engines they don't run the fan, either the one that originally came on the new unit in November or the one the tech just replaced. If nothing else the returned smoke unit with the new motor should work when I plug that smoke unit into either engine, but it doesn't. Also, when I plug any fan motor into either of those 2 working smoke units it always runs. So what's up with that? I have to go out for awhile but will test these boards for the +5v when I return. Thanks again. John
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