MTH U50C Smoke Unit and Lights Not Working

I believe that engine has springs and pads for the connections to the shell. They have to be aligned perfect.  Take the shell off again and set it down on the chassis and wiggle the shell a little while applying  downward  pressure on the spring contacts.

Chuck, you are correct about the setup. I made sure the springs were in propely, plastic wire connectors were in securely, and made sure the springs were touching the pads. I even shimmed the plastic sliding pieces that house the springs with celophane to make them a little tighter to be sure the were touching the pads. I fear i have a bigger problem here.

Chuck is correct - I have that engine exact same and it does have spring contacts.

I find that gently stretching the springs and ensuring that the spring blocks are as close to the bottom of the cab as possible will often restore lost lighting.

However, that will have nothing to do with the loss of smoke. For that, I would trace the 4 wires from the smoke unit back to the PS2 board (2 for the fan and 2 for the heater resistors) for either loose connections, or pinched or broken  wires.

One thing to note is to be very gentle with the cab. Your model has a cab that is prone to cracking if not handled with the proper amount of TLC. I had to have mine replaced because it started coming apart.

Did you do a factory or feature reset?  DCS or conventional operations?  Having all lights, smoke heat, smoke fan all not working is significant, if not a simple factory reset.  Can the couplers fire?  G

George, I did a feature reset and then a factory reset using DCS neither solved the problem. I do believe both couplers fire, but i will double check that. I'm begining to fear repair may be beyond my capabilities. Could be a job for you if you are interested. I also have an MTH  DAP Santa Fe decapod that is completely on the fritz! Several issues with that one!

Sure, my e-mail is in profile, I can test board out of engine and go from there, I am thinking board issue because of the number of items not working.  G