Electronics > Repair

Mastech HY5020E 50v 20a Bench Supply: Economical to repair?

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Seekonk:
Send me your old caps! I'd be perfectly happy using them.  I'm pretty amazed at how expensive even crap ones are from China. Doesn't matter if some of the shrink is burnt off.  If you were happy before, they aren't an issue. 

richfiles:
I would actually like to get one of those component/ESR testers. I know they're pretty much just a micro with and LCD running a testing program. I think it'd be useful to have around, and they are pretty dirt cheap too. Every gut instinct tells me the caps are just fine. I just have not tested the ESR yet. I feel like it's probably gonna be fine, but I just don't know yet. This puppy went bang pretty hard.

And you're right... those caps can get spendy! I normally spam part replacements, just to be on the safe side. If I think a part was even slightly stressed, I prefer to replace it. When you have 4 parts that cost $4-7 each... The cost adds up quick, though. As long as they test okay though, i'm gonna reuse them, I think. At least for testing anyway.

bitseeker:
An ESR meter is definitely a good thing to have. If you have an oscilloscope and function generator and don't mind a little math, you can still measure ESR.

richfiles:
Haha! I already have THAT video up on another tab! I just haven't had the time to do anything. Probably won't have time for about 2 weeks, due to work. I'll have to clear my workbench for my current order...

But yeah, definitely looking at getting one of those cheap combo component testers. At the price, why not. Looking at http://www.ebay.com/itm/2016-EZM328-transistor-tester-ESR-table-frequency-meter-square-wave-genera-/172129915560 at the moment. Seems to be latest rev, with socketed micro (good for testing flashed rev updates).

bitseeker:
Yeah, real life has a way of taking over. I haven't seen that particular version of tester. It seems to have most of the right stuff (encoder, socketed uC, plug for leads). I couldn't tell if it has input protection. I wonder what the little trimmer pot is for. Screen brightness? Anyway, that'd be a discussion for https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/

Looking forward to seeing how the rest of this supply turns out when you're back from your income-generating project(s).

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