I don't know if this will be helpful, but I did find a link where someone had another problem with that controller (http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=27352), and that link had a link back to this forum (http://cs.trains.com/trccs/forums/p/143181/1591917.aspx). If you scroll down in the second link there is a little circuit diagram based on another Troller product, but there might be some similarity between the two items.
Does any one have or know where I can get schematics for this pack. The AC still works fine, but the DC is dead. I understand that Troller is long gone. Thanks!