I have been repairing my Lionel product # 6-38095. On the fan driven smoke unit the resistor was bad and the AC regulator board was shot. I have replaced these components. My problem that still exists is that the fan will turn on for only about 2 seconds and then will shut off. If I use my remote to turn smoke off and then back on the fan again will run for about 2 seconds and shut off again, the resistor for the smoke unit stays on the whole time I have the smoke unit activated. The fan itself works when bench testing and I am struggling to find what my next step is. Could it maybe be the separate capacitor in this circuit? Any suggestions would be awesome.
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What resistor is in the smoke unit? If its a 6 ohm resistor you should replace it with an 8 ohm resistor as the 6 ohm resistors have a reputation for eating AC regulators. Another possible culprit is the wires going to the fan motor may need to be re-tacked with fresh solder or replaced. A similar thread for these problems popped up a while back and here's the link for it, hope this helps.
@Peter B Thank you for the tips. Yes I did replace the 6ohm resistor with a 8 ohm. I also did look at the discussion you linked thoroughly last week (which gives me some relief we are on the same page haha). I will check the fan leads again. when testing with a battery the fan works A Ok. Just when put back together I wont stay on but for 2 seconds.
Sounds like the power supply for the fan on the smoke unit is the issue. Check the 5V supply, it's pretty simple, a diode, cap, and the 3-terminal regulator. My guess is it's either the cap or the regulator that is crapping out. Many times the cap comes loose from the board, that would cause a brief burst of power from the regulator and then no voltage.
No, actually the regulator components I speak of are on the smoke unit PCB. You can see the large cap I speak of in the picture from the exploded parts view. The regulator and diode are close by. I don't have that exact smoke unit to look at, so without seeing it, I can't be more specific.
So I am still having no luck. It appears the power supply checks out. I have now tested with 2 new PCB boards and no luck. Again the only time the fan kicks on is for a second or two when on my legacy remote I hit the plus button a few times to turn on the smoke unit. Again I have new PCB and AC regulator on this loco. Any suggestions?