Electronics > Repair
Korad KA3005P power supply faulty/repair
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AllanMN:
The KA3005P arrived today from SRA Soldering. QUick.

Some testing... and.... the negative isn't floating. It surely IS suppose to float on this supply, right? Because if I connect negative to ground it draws over the CC setting (i.e. set to 0.1 it draws 0.2) with nothing on the positive. I noticed it when I tried to scope the output with scope ground to negative.

Allan
TopLoser:
I've recently heard the phrase 'Single use only' being applied to these power supplies. Korad, Tenma, whatever the name that's stuck on them.
AllanMN:
'Single use only.... lol.

Yes, I think of them as more of a kit/project. You start with what you get and go from there. So, this thread, and a partial schematic makes for a just more interesting project. I guess.

Allan
baljemmett:

--- Quote from: AllanMN on January 24, 2014, 11:06:34 pm ---Some testing... and.... the negative isn't floating. It surely IS suppose to float on this supply, right? Because if I connect negative to ground it draws over the CC setting (i.e. set to 0.1 it draws 0.2) with nothing on the positive. I noticed it when I tried to scope the output with scope ground to negative.

--- End quote ---

Now, that rings a bell; something about a chassis screw in a really stupid position...  *rummages*

Ah, unfortunately that was on a Mastech supply, rather than one of the Korad threads -- so it's not an already-documented issue with this model.  But just in case it's of any use, https://www.eevblog.com/forum/reviews/bench-supply-ground/ has the gory details.
pomonabill221:

--- Quote from: AllanMN on January 24, 2014, 11:06:34 pm ---The KA3005P arrived today from SRA Soldering. QUick.

Some testing... and.... the negative isn't floating. It surely IS suppose to float on this supply, right? Because if I connect negative to ground it draws over the CC setting (i.e. set to 0.1 it draws 0.2) with nothing on the positive. I noticed it when I tried to scope the output with scope ground to negative.

Allan

--- End quote ---
I checked both the positive output and the negative relative to chassis ground and they ARE floating.... Your supply may have a problem.
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