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Old 26th July 2010, 05:46 PM   #1
Reidy- is offline Reidy-  United Kingdom
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Default Capacitor electrolyte or just glue?

Opened up my subwoofer to try and work out what is causing the intermittent popping noise.

nothing looks decidedly suspect other than these cap's

my capacitor tester only goes up to 200uf and these are rated at 2200uf @ 35v so dont have anyway of truly testing them.

but if the leakage is electrolytic fluid then they will need replacing

please have a look at the image and see what you think.

http://img842.imageshack.us/img842/6754/p1000769.jpg
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Old 26th July 2010, 06:16 PM   #2
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Life is too short to wait for that image (dial-up here), but remember that electrolytic caps don't have much liquid in them. If you see a brown deposit of any significance, it's glue. If you see something that looks like a dried up white deposit, I'd get suspicious.
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Old 26th July 2010, 06:38 PM   #3
avr300 is offline avr300  Denmark
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Looks like glue to me.

Now you have them taken out pop in some new ones. Just to be safe.
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Old 29th July 2010, 06:01 AM   #4
amc184 is offline amc184  New Zealand
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Looks like glue to me as well. I'd also recommend replacing them, they don't have to spew electrolyte everywhere to be performing badly. Replace them with some quality equivalents, like Nichicon, Nippon Chemicon, Elna etc.

Quote:
my capacitor tester only goes up to 200uf and these are rated at 2200uf @ 35v so don't have anyway of truly testing them.
Unless your capacitor meter shows ESR, it isn't going to help with detecting all but the most catastrophic failures.
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Old 29th July 2010, 06:41 AM   #5
Mooly is online now Mooly  United Kingdom
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Agreed... glue
Make sure you fit good quality parts that are physically the same size.

For those on dial up,
Attached Images
File Type: jpg Caps.JPG (46.8 KB, 132 views)
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Old 30th July 2010, 01:24 AM   #6
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I have never seen an audio product's cap leak, but I have seen many computer motherboards and they are usually bulging at the top along with leakage at bottom. It makes sense that the pressure would build internally, cause bulging at the top to a point, then begin leaking from the bung. That dark brown glue is very common. Most likely glue.
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Old 30th July 2010, 01:34 AM   #7
wwenze is offline wwenze  Singapore
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Glue, if the electrolyte leaked from the bottom it couldn't have travelled upwards against gravity.
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Old 30th July 2010, 08:06 PM   #8
Reidy- is offline Reidy-  United Kingdom
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Hi, thanks for the responses I bought a new tester and you were right it was glue however I found out that these caps were largely out of balance where as one read at 2100uf the other was at 2500uf.

cheers, Reidy-
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Old 30th July 2010, 08:13 PM   #9
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hi,
You could just replace them those are not expensive,
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Old 30th July 2010, 08:21 PM   #10
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Sorry, but you misunderstand.

21/22 is about 5% low. 22/25 is about 12% high.

Both well within a 20% tolerance. Even for 10% caps it isn't bad.
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