On Sun, 22 Jan 2023, gene heskett wrote: > On 1/22/23 04:19, fxkl47BF--- via Emc-users wrote: >> On Sat, 21 Jan 2023, gene heskett wrote: >> >>> On 1/21/23 20:23, fxkl47BF--- via Emc-users wrote: >>>> i acquired a non-working ps 613u power supply >>>> two 2200uf caps had exploded >>>> i replaced them and it appears to be working >>>> my complaint is the voltage and current pots are very sensitive >>>> it's near impossible to adjust them with any precision >>>> i'm thinking to replace them with multi-turn pots >>>> is this a good idea or a waste of time >>>> >>>> https://www.velleman.eu/downloads/2/ps613a502.pdf >>>> >>> The caps exploded? On your bench or sometime in the past? >> >> that's how it was when i got it > > So you don't know the history. As a CET my best guess in that case would > be that its a 125 volt unit, accidentally plugged into a 250 VAC circuit > and turned on. What size is the fuse supposed to be? It should have > cleared before the explosions of the caps. There might be other failures > in the aftermath. input rectifiers need checked, So would the switching > transistors in the power circuit. Once you think you've found and > replaced the obvious stuff. I'd fire it up on a powerstat set for 50% or > 60 VAC, and raise it slowly over several hours to normal input voltage > while scanning it with an IR thermometer looking for other hot components. > > This is a CET's SWAG, so plz report what you find.
after i replaced the caps i fired it up the fuse was not blown it works as advertised but is very difficult to adjust _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
