John, HC52, I checked the voltage from the smoke unit pcb and got no reading at the female plug where the fan plugs into. On the test track I checked power from the plug you diagramed. With a connection on red, I got 17.6vac(matches track power) on the chuff sw white wire; 9-10vac on the ac regulator black wire; 17.6vac on the H+ black wire(don't know what that is). So it seems to me there is power to the smoke unit pcb. Your picture of the pcb is very close to the one I have. Then I put the chassis on the track and pressed the reset button on the Cab2. The manual for the engine doesn't mention an engine reset that I could find. I'll put the smoke unit back together and install to check if the reset corrected anything.
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