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#1 |
Senior Member
Join Date: Jul 2012
City & State: Suffolk
My Country: United Kingdom
Line Voltage: 230VAC 50Hz
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![]() Hi,
I've removed some electrolytic caps from a Hi-Fi power supply which are Asia'x? Two of them both 470uF 10V have a high uF value, one reads 693.6uF ESR- 0.12R and the other one reads 670uF ESR-0.12R? I presume caps have a tolerance, either 10 or 20% so even at say 20% they would be still over their uF limit? What effect will these have, will they still work? Thanks, Albert. |
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#2 |
Badcaps Veteran
Join Date: Jun 2012
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![]() Usually if the capacity measures higher they are bad.
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#3 |
Badcaps Veteran
Join Date: Aug 2005
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![]() IIRC, if a 'lytic cap measures well out of tolerance high that means the aluminum oxide dielectric layer has thinned, increasing the capacitance, but reducing its actual breakdown voltage. The typical tolerance for an electrolytic capacitor is +/-20%, 564uF max for 470uF parts.
You might be able to re-form these parts, though they're a junker brand not worth the effort except as a learning experience.
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#4 |
Senior Member
Join Date: Jul 2012
City & State: Suffolk
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![]() Hi, thanks for your help. I've not seen these Axia'x before and they came out of a Panasonic SA-AKX16 CD Stereo System which is completely dead. Am I correct in saying that if all the other caps were good on this board but I left these 470uF high value caps in place, would that have a serious effect on the unit?
Albert. |
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#5 |
Great Sage 齊天大聖
Join Date: Dec 2009
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My Country: some shithole run by Israeli agents
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![]() electrical leakage is BAD, change them or something could get damaged.
or the caps could heat up and potentially explode or burst open and spew electrolyte and bits of paper all over the place. |
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#6 |
Leaking Member
Join Date: Dec 2014
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![]() I replace all caps that are not within spec.
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#7 | ||
master hoarder
Join Date: May 2008
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![]() +1
A bad cap is not going to get better over time. Quite the opposite - it will only get worse. So it's indeed better to replace it. Quote:
Fun fact: Sacon FZ caps have their stamps done from the inside the case, which causes them to burst the vent rather violently when they outgas (sounds like a fire cracker going off, really.) Although you won't find then ejecting paper, they often spew electrolyte quite far. I tried it last week with one and it threw electrolyte spray/mist/droplets more than a few cm / inches away. Quote:
Unfortunately, I haven't seen any caps with high capacitance get healed from this. Last edited by momaka; 10-14-2020 at 08:19 PM.. |
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#8 |
Badcaps Veteran
Join Date: Jan 2018
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