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Hi Al - I have a NYC Lionel Mohawk TMCC (6-38053) one of my favorite engine - great sound set.  Anyway, the smoke force out of the stack has gotten weak.  There is plenty of smoke volume, but coming out of the stack, it just waifs out.  Had it apart and the motor is spinning and at slow speeds will pulse, but it seems to have no force.  Checked smoke chamber nothing appears to be blocked. Any ideas what to look for?  Thanks

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The impeller fan could be loose on the motor shaft. The motor spins up to the correct speed but the impeller might be slipping on the shaft. I've seen this a few times, I'd remove the impeller, clean the shaft from any contaminants (smoke fluid), and pinch the opening with needle nose pliers to increase the grip the impeller has on the motor shaft.

Last edited by H1000

It could simply be the motor.  Also, the 5V power source on the smoke unit may be dying, top suspect is the capacitor or regulator.  Finally, the impeller could be slipping on the shaft.

The smoke PCB isn't available, so if the regulator circuit is dying, you'll have to entertain the option of repairing it.  An easy way to check it's health is with the locomotive powered and the smoke unit running, measure the power supply voltage.  Measure the DC voltage using the ground reference, if you don't get 5VDC or very close out of the regulator, that's a problem.

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If the voltage is low, I'd look closely at the capacitor, it's probably either bad or loose from the board.

The Super-Chuffer replaces all the logic on the semi-smart smoke unit, so clearly that would solve that problem.  Obviously, it's more expensive than repairing the smoke unit board, but it also does a lot more.

Note: the capacitor is on the bottom of the board.

Last edited by gunrunnerjohn

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