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I'm trying to replace a smoke fan motor in a PS1 AC-6.  I ordered some DC 3V-5V 3.7V 4.2V 31000RPM N20 motors because they seemed the correct dimensions and voltage.  I wired one into the board and.... nothing.  I tried a stock fan motor unit out of another engine, a PS2 GS-4, and it worked fine.  But this new motor I bought won't move at all.  It works fine when 3v DC is applied from a battery pack.  What am I doing wrong here?  Are PS1 smoke motors some special unit?

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@Knight007 posted:

It does run directly on track power, but the smoke chamber and fan housing are mounted on and connected to a board.

I’ve seen PS1 smoke units take a dump, ...first thing to do is verify track power is getting to the board....there’s a clearly marked plug on one side that has AC in marked on the board....black & red wire...

Pat

Last edited by harmonyards

I know everything except the motor is in order.  Everything works fine when I use the motor from another model.  The problem is I can't get this new replacement motor to work when installed though.  It runs fine when I apply 3v DC power from a battery, but won't work when plugged into the smoke unit board.  I don't get why one motor works and the new one doesn't.

@Knight007 posted:

I know everything except the motor is in order.  Everything works fine when I use the motor from another model.  The problem is I can't get this new replacement motor to work when installed though.  It runs fine when I apply 3v DC power from a battery, but won't work when plugged into the smoke unit board.  I don't get why one motor works and the new one doesn't.

Your new motors must be exceeding the amp capabilities of the board....not all those motors are created equally...I think John has said what the mA is , but can’t remember what he said it is,...it’s stupid low amps .....anything to high, and it’ll strain the PS1 smoke motor driver....

Pat

If someone could post the exact specs on the proper MTH smoke unit motor, I'd really appreciate it.  I've been ordering different motors to fix this engine for three months now and haven't found a match yet.  Either the dimensions are off, or like these new ones, they fit perfectly and then just don't work.  Starting to feel like MTH purposefully uses stupidly exact components so you give up and order directly from them.  Except soon that won't be an option.

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