Reseting / Repairing AIU

Jim,

Hi, try one AIU separately first. if one works and then try your second one. I hope that you didn't fri one of the AIU Curcuit Board. if you get them bolt working again install a single pole switch, double pole switch  so only one AIU is woking at any giving time. Good luck !

kb2agpjohn@aol.com or 848-992-2157 John

Jim,

If you did fry a relay, just skip it and use the enact one.

As long as you don't reset the DCS Remote, you won't lose any AIU info if you swap out one AIU for another.

John,

if you get them bolt working again install a single pole switch, double pole switch  so only one AIU is woking at any giving time.

Why would you do something like that?

The AIU is a pretty simple device, and I believe most of the stuff on the board can be repaired.

I'd first open it up and see if there's any physical damage due to the excessive current.

That the AIU still clicks and that the 2nd AIU (further downstream from the TIU) work are good things.  A large portion of the control circuitry inside the AIU needs to be working for these things to happen. 

Did you see smoke or can you smell anything untoward (compared to the 2nd AIU)?  As GRJ suggests, if you can open it up if there was an overload it ought to be obvious.  There are no user-replaceable fuses or reset button in the AIU though.  It's very odd that ALL your functions aren't working.  If ONE relay (output) was overloaded and failed, it should not affect the other relays as they are separate circuits which are electrically isolated.  If it turns out that just a single relay failed, it is repairable though it requires soldering re-work; the relay component itself is just a couple dollars.

Actually, my first thought was to double-check the wiring external to the AIU.  Perhaps when wiring up that last accessory a power bus wire that feeds the "IN" terminals on all the AIU ports came loose such that there's no power to switch.

Thanks so much to all who replied.   Really appreciate the help.   I did finally call MTH Tech Support and the technician said that I probably blew one of the circuit boards since none of the ports are functioning.   He said the part is $8-10 and it would be $45. labor.   So I plan to buy a new AIU and replace the bad one today and just send the other in for repair (I will need a 3rd one anyway and its about 1/2 the cost of a new one).   As Barry suggested,  he confirmed that I should be able to just swap the AIU's without without have to re-input the switch or accessory names.   So hopefully back in business tomorrow!