I recently purchased a new rev L TIU to replace an older TIU because of some performance issues. When I simply swapped out the old for the new, the rev L TIU did not produce power from the variable circuit 1. All other circuits work fine. I am using an auxiliary power supply. I reprogrammed the TIU and remote (with insightful support from this forum) hoping that this would solve the problem, but it has not.
Is there possible a DCS programming step that needs to be done or should I dismount the TIU (really a pain removing it from under the layout) and check the fuse?
Thanks,
Tom