If you can obtain/borrow any thermal imaging device, then run with the PSU with covers off and check every 5min. You should identify a cap-thermal problem.
On Sat, 2 Dec 2023 at 21:14, John Dammeyer <jo...@autoartisans.com> wrote: > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > > > If it is a simple linear power supply, yes they are very easy to debug > and > > repair, LIkey it is the caps. > > > > But switching power supplies are much harder to debug, You can guess it > > might be the same issue but these have dozens of parts that can fail.. > In any > > case, the cost to repair is small. > > > > I disagree. Switching power supplies are way more likely to fail from > high ESR. That the system runs for a short while and then fails is again a > symptom of a capacitor overheating due to high ESR. Or the voltage is > right on the edge and as the cap warms up the heat results in a change that > results in the power supply moving out of spec. There may even be enough > heat developed on the board that a solder joint becomes unreliable. > > In the past even PC motherboards have been repaired by a wholesale swap of > the electrolytics. > > So what I would do is an initial survey of the electrolytic capacitors > inside the power supply and order a set. That way the machine can still > run for an hour or so a day while you wait for parts from a reputable > source. Then replace the capacitor when they arrive. That won't prevent > the power supply from working again and it may well fix the 1 to 2 hour > failure period. In either case $30 or so worth of caps is cheap. > John > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
