smoke unit on lionel sd90 #8049 | O Gauge Railroading On Line Forum

JhainerOGR Forum Member

When I pick up this engine the smoke unit was burned up so today I finally bought a new one put it in the engine but no smoke fan comes on sounds work everything seems to work but the resistor doesn't heat up. What else should i look for. The old one looks like there was fire checked fluid as it was new tried second unit since i have 2 new ones neither work checked the switch its on. Turned on with tmcc also.

1/19/168:06 PM

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JhainerOGR Forum Member

Also did a reset of the engine.

RickOOGR Forum Member

Whats the model#?

It could be a bad regulator, often times when the regulator goes bad a loco will smoke like crazy/overheat until the regulator quits altogether. Then it doesn't heat up at all. Lionel sells replacement regulator boards.

Your "burned up" description sounds like this may have happened.

JhainerOGR Forum Member

6-28201

RickOOGR Forum Member

The regulator is #2 here: 6-28201 parts

Its usually in black shrink wrap with the 5 wires( black red and brown) coming out

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JhainerOGR Forum Member

Ok nevermind your right its the regulator once i knew what it looked like i see someone put tape on it removing the tape its cooked

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