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I have an MTH New York Central 4-6-4 Dreyfuss Steam Engine with Proto Sound 2.  It is item # 20-3045-1.  This engine, along with several other MTH engines, is being controlled by my MTH Digital Command System, and run very well.  However, this particular engine does not respond to the Smoke on/off button on the remote controller.  When you turn the smoke off, the smoke unit in the engine just keeps on working.  A suggestion was made to me that the transistor that controls the smoke unit in the engine has gone bad.  I am looking for opinions, replacement part numbers, diagrams and any suggestions that can be offered.  Thanks very much.

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Need a picture of the inside and smoke unit.  This sounds like a PS-1 smoke unit which is powered from the track voltage via the switch.  I have seen folks who have blown the board, rewire the smoke to track or PV. So again is this a new phenomenon for your engine, or is this a used engine you bought?  G

When in command-mode the smoke on-off switch on bottom of engine should do nothing.   I'm with GGG on this one - I'd say the next step is to look under the hood.  

I'm imagining a scenario where the smoke stopped working and, rather than repair the PS2 smoke electronics, someone re-wired the smoke heater/fan to bypass the PS2 electronics with only basic on-off control from the slide switch.  Thus, the PS2 electronics has no control over smoke (no puffing, no lo-med-hi control).

Did you get this engine new and/or did the smoke ever work in your possession?

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