I believe I have a TMCC S-4 with a bad smoke unit regulator and need confirmation. Let me start with the reg board only powers the smoke resistor. The fan is driven off of the R2LC smoke output circuit and that’s not an issue. I noticed Lionel added the smoke unit regulator to this model after 2002? probably due to complaints of lack of smoke volume?
I’ve gone through trouble shooting and here are my results:
•getting track voltage into the 691-ACRG-ES2 regulator and no voltage is making it out of the triac which is the last component before the brown/blk stripe wire (goes to the smoke switch and then smoke resistor)
•The brown wire on the reg board has 3.6V
•Red and Blk “+/- input” wires have voltage
•Blk “-out” wire was clipped and only 1” long. I didn’t see any wire laying around that would’ve been severed from it. Crappy workmanship? (Also have a yellow wire on the ACDR with a rather large wire nick and it has a random spliced red wire that is 1/2” long and cut at the end of the heat shrink and left exposed.)
So, I believe the reg board is garbage. I’m guessing the 8 pin IC chip flaked out. What’s the point of having this board? Did Lionel add this to up the current capability to the resistor through an auxiliary voltage reg therefore saving the R2LC board? I think I’ll just replace the resistor with a 22 ohm? and omit the reg board. Will this be safe for the R2LC? Any input will be greatly appreciated.