> The serial connection is not the problem (unfortunately). It seems a > thermal problem.... When I switch on the unit it takes a couple of > minutes before the Error-LED starts flashing. Doing a "fast" > power-cycle immediately gives an error-warning (the red-LED start > flashing almost immediately after switch-on). When I let the unit > cool down for some time (say ten minutes) it takes a couple of > minutes before the error-LED comes on.
I don't have any good suggestions. > To my opninion everything inside gets quite warm... Maybe it is a bad > capacitor (high ESR). The crystal is ovenized so I'd expect that area to be warm. DC-DC bricks get more than warm when running at full power. But after the crystal warms up the load should drop way down. I took mine apart and was pleased to find a DC-DC brick. I found the data sheet via google. It says 20 watts and 9-36V (wide range) input. That was nice since I had 24V handy but didn't have 15V. The data sheet says 81% efficiency, slightly lower at low loads. My unit gets just barely warm as measured by my fingers on the outside of the box. I don't know what it's like inside. If you don't find anything obviously wrong/hot when poking around, I can take the cover off mine and get some reference temperatures. It might be worthwhile measuring the input voltage/current, both during and after the crystal warms up. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.