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Reply to "Atlas O w/TAS Smoke Unit"

Hey Gunrunnerjohn,

I just picked up a project Atlas GP-35 with Train America Studios EOB electronics (factory installed). The seller noted it didn't run and didn't have an idea why. I took a risk and picked it up cheap. I found a 6.3V 1000µf capacitor on the mother board had blown out. I replaced it and everything works except for the smoke unit. The fan motor was slowly spinning backwards while twitching. My thought was an issue with the wiring so I traced them back to the mother board. The hot and ground from the motherboard to the smoke unit board appeared to be switched. BUT, everything looked to be factory pinned? I switched the pins and the fan works properly but the heating element doesn't work. I checked the thermistor? and that's good. I checked all of the components on the smoke unit's board (it's separate from the smoke unit's body) and found nothing wrong. I can't figure it out. I jumped 2 of the 3 solder pins for the semiconductor (triac T2322BG next to the 4 pin plug) on the board and the element heated up. Do you think the triac is bad? How robust are they? Thoughts?

***I saw that you have the wiring diagrams in PDF on another post. Would you be willing to email them to me?***

Last edited by DanVW

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