@POTRZBE posted:I had the same thing happen with a Challenger Lionmaster from that era. 3 smoke units later I am done with it. Great engine, crap smoke units.
It's very difficult to believe you have had smoke unit failures that needed a smoke unit replacement! Of the hundreds I've worked on, I've replaced very few smoke PCB's from runaway regulators, and two diecast smoke units from zinc pest. It's FAR more likely that the smoke regulator is crapping out. This era of early Legacy locomotives were still fitting 6 ohm smoke resistors, Lionel changed to 8 ohm resistors because the lower value was cooking the smoke regulators. They also recommended any received for service change the resistor to the 8 ohm part.
