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I have a TIU rev H1 that has developed the following problem.

You press a button on the remote and the engine will respond from now to not at all.

Most of the time its between 1 to 3 second delay.

 

I bought a new TIU REV L and this is not happening.  The engine responds promptly.

So I know its a TIU problem.   

When this problem started I was running two engines, one with MTH passengers cars with light bulbs.

The problem occurred instantly.  One moment the engines respond promptly.   The next everything is delayed.   Something happened.

 

 

I even verified on an oscilloscope that indeed there is a delay between the time  you press a remote button and the time the signal gets sent to the track.

The signal level to the track is good and the signal is good,   The engines always responds if a signal in sent out.  It's just delayed or never happens.

I have tried all the factory resets , tethering the remote.  All TIU channels have the same problem.   Nothing has fixed the problem.

 

Does anyone have a clue as to what component in the TIU has failed to cause this and why?

 

 

 

 

 

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Thankyou for your reply.

I have tried reseating  the transceiver board. There is no difference if I am tethered to the remote or not .

I also tried removing the transceiver to see what would happen.  With the remote tethered there was no change.   Without the tether there is no response with the transceiver removed, as expected.

It seems like the transceiver is working, otherwise nothing would happen at all.  Could there be some other component on the main board that is faulty?

I am not sure if this helps, but the whistle, bell respond better that the speed wheel.   With the speed wheel I have to wait about 5 seconds before advancing to the next speed or nothing else responds on the remote.

The bell and whistle take about a 1/2 second most of the time.  Again, with my new TIU everything works.

Not sure what changing to Speed mode is going to do for the issue.  Since it most certainly should work in normal mode, and certain commands require feedback from the locomotive anyway, you're not solving any problems, maybe just partially masking them.

At this point, I have no idea what is going on with the TIU.  The fact that tethering it doesn't change it seems to eliminate RF issues between the remote and the TIU.  My next attempt would be to try a different remote, but since it works with the Rev. L TIU, that's probably not the problem.

I'm at a loss at this point what could be doing what you see.

Not sure what changing to Speed mode is going to do for the issue.  Since it most certainly should work in normal mode, and certain commands require feedback from the locomotive anyway, you're not solving any problems, maybe just partially masking them.

At this point, I have no idea what is going on with the TIU.  The fact that tethering it doesn't change it seems to eliminate RF issues between the remote and the TIU.  My next attempt would be to try a different remote, but since it works with the Rev. L TIU, that's probably not the problem.

I'm at a loss at this point what could be doing what you see.

John,

In speed mode the remote doesn’t wait for answers from the TIU or engine, can’t remember which. Either way I though if it worked in speed mode that might tell us if the transmit part of the TIU is the problem.  I guess it only matters if there is an ACK/NAK process that happens when the remote is in normal mode.

Another thought, I don’t know if the TIU transceiver boards are universal across revisions of the TIU but if they are OP could try to swap them between TIUs and see if the problem “moves” with it. 

Last edited by rplst8

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