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 We were running trains for a couple of days inside. We ran several different engines for fun. I had both 2 rail MTH Alleghenies on the 2 mainlines. The older PS1 to PS3 version that I had converted slammed to a stop and seem to be shorted out. I couldn't find a reason. Tried applying power again and it seemed to draw as much current as I applied while bringing up a handle of a Z4000 (5-6 amps).

 I took it off the rails and put her on the bench. Couldn't find any short? I tried just applying power to the tender but nothing. I connected it to the engine and still nothing. I thought their was a short with the smoke unit so I had unplugged it. I believe it was just the elements heating up without any fan running.

 Anyways I finally decided what the heck. I left it powered up on it's side and tried repeatedly to do a conventional reset. On about the fifth time I jumped as the engine sounds sprang to life. It didn't run correctly so I did the reset one more time. I got a couple horn toots reply and then it ran good.

 After testing everything as best as I could, I plugged the front headlight and smoke unit back in while it's still laying on it's side. It ran good for a time or two and then I noticed it chuffed a couple of times after that with nothing moving? I think somehow the board got severely scrambled and it may recover? or maybe not. At least it runs. Seems like the smoke output is higher than anything else I have! 

 So I'm left guessing on what happened. I believe it may have been some intermittent power making the board get confused. It seems like the boards ran the smoke elements yet wouldn't do anything else. I don't know why the high current draw happened or what made it slam to a stop. I will keep searching for some short. It has an old PS1 smoke board that was cut at the traces. So I took my saw and cut that whole end off incase that's what shorted to the shell somehow. I will apply tape to what's left.

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Whoa, I thought I had found the problem. All of a sudden I notice one wire is off of the elements and the solder blob has moved so that it was against the metal funnel. It's odd that I didn't notice that? The smoke unit is laying on the bench tilted from it's weight and the bracket.

 So I resolder the wire on, clean off the extra, and it happens right in front of me again. The elements start heating as soon as power is applied, and the solder starts flowing, and the wire popped off again. Wholly s...

Either the elements are shorted, or the board is going?

 I quickly unplugged the smoke and the engine fired up normal when power was applied. Looks like I'll be running this without smoke.

Last edited by Engineer-Joe

Maybe something for others to look at? If you see the smoke unit fire up right when power turned on, board has a bad FET?

Funny that it ran a few times before the problem got so bad. I must have fired it up 2 or 3 times with different results.

I will post back when the board gets serviced. I have a bad feeling, there's more going wrong. It did seem to run correctly when the smoke unit was unplugged. Fingers crossed. 

Last edited by Engineer-Joe

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