If the emitters are IR, look at them with a digital camera with
viewfinder on. Most cameras will pick up IR and it will show on the
viewfinder as visible. This may tell if the emitters are active and
proceed from there.

I tried that. I did not see any light coming from the emitters. I think at
this point, it's just going to be easier to swap out the emitters and see
what happens.

Thanks for your reply.

--
David Farber
Los Osos, CA