Troller went out of business a long time ago and the failures like you're experiencing was one of the things that did them in. This question came up a couple of years ago and no one had a schematic or could identify any of the parts as anything currently available.
We had two Troller power packs at our club with the exact same problem.
I remembered in "Easy to build electronic projects for model railroaders by Peter Thorne", he talked about repairing Troller packs. So I went and dug up the book...lo and behold, he talks about everything in the pack...but the voltage regulator's.
I thought I could help, but it was for naught....
Bob Berger, C.O.O. N-ovation & Northwestern R.R. My patio layout....SEE IT HERE
There's no place like ~/ ;)
I had the same thing happen a couple years ago .... a fried output transistor. I WAS able to get the part number off the transistor package only to find it to be a discontinued part. After an exhaustive cross-referencing search, the only thing I came up with was an electronics supplier in Africa that was more than willing to sell me a minimum order of 100 pieces !!!
The Troller pack still remains in the back of the closet ....
Mark.
¡ uʍop ǝpısdn sı ǝɹnʇɐuƃıs ʎɯ 'dlǝɥ