On Sunday, June 2, 2019 at 4:44:05 PM UTC-4, David Fleig wrote: > > I've got a Nixichron purchased from Jeff Thomas years ago that's not > behaving. It starts up and runs fine for several hours or even a few days > then starts emitting a continuous beep and the display goes blank. > Unfortunately, it's random enough that no ones seen it actually happen, we > just hear it. Unplugging it and plugging it back in fixes the problem > until it happens again. Jeff had fixed this issue a couple times for me > but I never got the details on what he did. I've looked over the board and > don't see anything obviously wrong. I've also pulled the processor and > level-shifters out, cleaned the terminals and replaced them but it hasn't > helped. >
I have one that used to do that a lot. Updating to the latest firmware (from MichaelB) helped somewhat, but putting it on a UPS seems to have solved the issue. Based on that, I suspect that some power glitches are latching up the power-on reset logic in the clock. Fitting a large-value capacitor across the power input may help (you can test this on a disposable power adapter, rather than opening the clock up again). -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/b11e821b-5714-44dd-9937-c0ac23a05cba%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
