There are two LED's on the circuit board next to the power supply module. One is green blinking. I'd never seen the other one on.
I needed to get them off of my bench power supply and onto a permanent supply. I tried a 24V 3A supply. They must have been cheating a little on the ratings. The voltage dropped down to about 16V when the oven heaters fired up. I noticed that the mystery LED was lit. It's red. A good guess is that it's a power fault indicator. The LED's are next to the black power supply module. A picture is attached. Also, Below is a link to some plots from Ulrich Bangert's Z38XX software of the initial day of operation. The units had about 30 minutes of run time before I got a permanent power supply, GPS Antenna and RS-422 connection set up. I thought it was interesting to see the graph of the EFC Value slowly flattening out. I guess if I was asleep for 15 years It'd probably take me a while to get going too :-) http://mesterhome.com/timenuts/gpsdo/ -- Luke Mester http://mesterhome.com/
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