Electronics > Repair
Korad KA3005P power supply faulty/repair
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oger:
That did it!
Just had to clean the encoder. No more steps missed.
Andreas:
in a german forum I have read that you can replace the encoder by ALPS STEC12E07 available at Conrad / Reichelt.

With best regards

Andreas
oger:
I t does not not seem to be a special encoder.
but cleaning seems to remedy the problem quite good.
No need to buy a new one. Especially mine was hardly used.
uv3afl:
Hello,

As this is my first post here I want to thank this forum and Dave Jones for plenty of constructive things I knew from EEVblog forum and videos!

I have recently purchased this device as I knew from several youtube videos to be not bad price/performance value. It seemed to be in working condition but out of calibration. It gave about 1,5% setting voltage error. Thanks to this theme I managed to calibrate it and it turned at last into some usable device! Anyway in couple of days playing with it I have run into some sort of a bug or what ever. I haven't seen anyone mentioned it. Thus I registered here and want to describe it and ask if anybody of you had such situation.
So. I attempted to charge a 18650 battery. The process went on normally in CC mode indicating 200mA and something about 3.45 volts on battery. At that moment I thought that there was no need to give it full charge and decided to limit charge voltage to some 'long term storage' value - 3,6 volts. I have set it up and surprisingly found out that it started indicating 3.6 immediately after setting. Multimeter attached showed that actual output voltage was still 3.47V... While indicated was already 3.6.

Some further experiments showed that when in CC there is a difference in set voltage and actual output voltage greater than 0.2 volts - everything is fine. Otherwise you will see limiting voltage instead of actual.

That's the story. Any comments?
Kleinstein:
Still showing the set voltage is a kind of cheating - the voltage display should always show the actual voltage. The only good exception could be with the output disabled and than with a clear marking that it is the set voltage and not the measured.

So it might be worth do a few more tests on this.
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