Is my TIU bad?

Connect the input power to Fixed 1 and Fixed 2 in parallel.  At that point, connect Fixed 2 to the track and see if you have any change.

You must power the TIU from either Fixed 1 input or the aux power.  When you connect only to Fixed 2, the TIU has no power to the internal circuitry.

Regarding Fixed #2, do as John suggests.

Question: are the engines all already in the remote? If so, the remote will not add them again.

If the engines are already in the remote, try just pressing ENG and using the thumbwheel to scroll to one of them to highlight it. Then, press the thumbwheel to select it. If it comes up in the LCD window, press Startup.

I have reset everything.  Therefore, there are no engines list on the remote.

I will try the Fixed 1 / Fixed 2 input power / Fixed 2 output tip.   

Okay,  I did what John suggested, connected z4000 output to both fixed inputs 1 & 2 on the TIU, and then fixed output 2 to the track.  Now DCS finds the engines.

So, what does this tell me?  Is my fixed output 1 non-functional?

Thanks

Sounds like the DCS output on Fixed 1 has died.

Recap:

You reset everything to defaults, then put one locomotive on the tracks and attempted to add it.  It works on Fixed #2 but not if you power the tracks with Fixed #1.  Remember, you should reset everything before trying Fixed #1 for the same test, as you have the engine already added from the Fixed #2 test.

If that's the situation, I suspect the TIU has had a failure.

Question:

When you apply power through Fixed 1 In & Out; do your PS-2 engines that are on the track stay dark and silent?

If yes, this means they are getting the watchdog signal.

If they come up in conventional, then likely the watchdog signal on Fixed 1 Out is non-functional.

You would need to send the TIU in to MTH for repairs. or if you only need one TIU channel, you can just continue operating as John suggested.

Rod

Rod

I had one where the watchdog came out, but I couldn't command anything.  It was fixed by MTH, they replaced a handful of chips and added diodes, then all was well.

His issue sounds the same except mine was all channels, his appears to be just one channel, we don't know about #3 or #4 yet.

If all is well on Fixed #2 and the engines can't be found on Fixed #1, regardless of whether, when power is applied, they immediately start up in conventional or stay dark and silent, the DCS signal generator (at least) on Fixed #1 is defective.

Unfortunately, it needs to go back to MTH for repair. They'll repair Fixed #1 and most likely apply a mod to all four channels that will greatly lessen the probability of a repeat signal generator failure.