gunrunnerjohn posted:If the smoke resistor is getting hot, check the 5V DC regulator circuit on the smoke PCB. If the resistor isn't getting hot, and it's not open, it's probably the voltage regulator module. I'd also replace the 6 ohm smoke resistor with the 8 ohm one, that was a recommended Lionel mod as the 6 ohm resistor was drawing excessive current and cooking the voltage regulator modules.
I’d be willing to bet it’s the 5V DC voltage regulator. How would I double check that and proceed to fix it?