Electronics > Repair
Korad KA3005P power supply faulty/repair
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cavlovic:
I got this power supply a couple of days ago and it worked well until today. I tested it by charging almost empty 72Ah car leadacid battery at 14V 4-5A, under supervision a few times. It worked all well.

Today when I try to do the same thing, once output is turned ON voltage readings are way off of actual voltage. Output on Korad reads 6-7 volts (14V set voltage) and my multimeter reads almost 13V (which is fine as battery is not fully charged).

I also measured current and it reads fine on both Korad and my multimeter. Only voltage reading is way off.

I believe it needs to be calibrated, but not sure how it got so messed up in a few days. I tried to find any information on calibration all day long, but had no luck. I also dissembled the unit but didn't find any obvious pots for adjustments, which led me to believe that it should be done through software or some kind of key combination. Does anyone know how to do this? Manual is all in chinese and I doubt it contains information about calibration.

Also, software which comes with this unit is complete garbage. It's half scrambled and unreadable and it also doesn't function at all. I need to change location to some automatic log location, but I can't seem to be able to do it, so I can only start unit from software but not adjust voltages and current.

Is there any other software that can be used with this Korad KA3005P power supply?

Thank you!
iloveelectronics:
There was a document posted not too long ago here. Try a search for it.
Bored@Work:

--- Quote from: cavlovic on October 20, 2013, 05:13:03 pm ---I believe it needs to be calibrated,

--- End quote ---

No, it doesn't. It needs to be repaired.
wraper:

--- Quote from: Bored@Work on October 20, 2013, 05:56:53 pm ---
--- Quote from: cavlovic on October 20, 2013, 05:13:03 pm ---I believe it needs to be calibrated,

--- End quote ---

No, it doesn't. It needs to be repaired.

--- End quote ---
+1
Carrington:

--- Quote from: Bored@Work on October 20, 2013, 05:56:53 pm ---
--- Quote from: cavlovic on October 20, 2013, 05:13:03 pm ---I believe it needs to be calibrated,

--- End quote ---

No, it doesn't. It needs to be repaired.

--- End quote ---
+1
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