MTH RK 1108 Challenger Smoke Unit

you can test it with track power ac or dc if its the proto 1 smoke unit.. it sound like you have a proto 1 smoke unit..whats wrong with it?  GGG showed me how to fix mine.. so far Id fixed  3 and moditfied my smoke units to really put out the smoke too.

You can test it by connecting it to an AC source at about 10-14 VAC.

It should produce plenty of smoke at that level.

There should be two board connections for power.

The fan motor should be already plugged into a separate connector on the board; leave it as is.

It would have been connected to track power originally.

The fact that it has been disconnected may mean it is faulty for some reason.

Rod

All of the PS/1 locomotives I've dissected have run the smoke from track power.  As mentioned, you can test it with 12VAC and it should run.  If the fan works, but the unit fails to produce smoke when connected, the most likely suspects are some of the semi-conductors on the board.  They would be pretty easy to replace.

It's nice when a plan comes together.

Rod