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Old 26th January 2012, 06:19 AM   #1
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Default NEED help identifying Wima Cap.

Okay I think I have a bad capacitor. The cap is WIMA and has a green casing (dont know about epoxy color since its still on board). But it has the following on one side (black letters).

2200
100-u
WIMA

and on the back/opposite side "2.5".


I've gone through a bunch of data sheets from wima and can't find one with the same color casing, does it matter? I know wima has them by color for a reason.

Anyways I think its bad because when testing it with my dmm on continuity mode it read 0ohm and beeped no matter if I switched leads. This doesn't happen with the other wima caps on the board, besides this one in question.

Thanks.
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Old 26th January 2012, 06:29 AM   #2
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You need to pull it out of the circuit. Something in the circuit could be shorted.
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Old 26th January 2012, 06:36 AM   #3
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Ahh, well someone used a jumper wire for the relay and that may be the problem. Having problems with the relay in my PA2 for second source (has two input sources with two remotes).
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Old 26th January 2012, 06:52 AM   #4
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But all it has is two winds from the transformer on one side and then on the other pin they are going to pin 8 & 11 on IC TL494IN. You think there's a short in the IC? I'll remove it tomorrow and check it out.

Last edited by jeanious2011; 26th January 2012 at 06:54 AM.
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Old 29th January 2012, 05:38 PM   #5
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Okay took it off the board and with my dmm on diode/beep test I place both leads on the board pins (where the wima in question was located) and it beeped. But notice both traces come from the transformer (both on the same side of the transformer) could this be a short in the transformer? I doubt it because it still powers up and worked with wima cap in board. It just wouldnt allow me for the second remote source to switch on the relay.

But once out of the board I went ahead and used my fluke 111 with capacitance mode and checked the wima cap and it read 3nf - which leads me to believe its bad but need second opinion.

Any help is appreciated.

Last edited by jeanious2011; 29th January 2012 at 05:52 PM.
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Old 29th January 2012, 05:40 PM   #6
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Should this "2200 100-u WIMA" wima cap read 3nf? Or is my dmm not capable or reading them because of limited range?
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Old 29th January 2012, 06:05 PM   #7
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This is what it looks like, same color for casing and lettering. Opposite side has "2.5" . Its exactly like the first picture, but thought I add the second since it had the opposite side.
Click the image to open in full size.Click the image to open in full size.

Where can I find some of these, it seems there only available in UK?

Last edited by jeanious2011; 29th January 2012 at 06:07 PM.
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Old 30th January 2012, 01:04 AM   #8
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It should likely read 2.2nF but the meter isn't likely going to be accurate at the capacitance. I think it's OK.

2200pF, 100v, 2.5% tolerance.
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Old 30th January 2012, 02:45 AM   #9
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Okay but it must be normal for two winds on the same side of the transformer to be on that cap (one on each lead).

I wonder why am having problems with "SOURCE 2" switching on the relay and powering up.

Perry do you think you can check out some pics I've taken, I did all the traces in color and have both sides with colored traces so you can check it out and let me know what you think.
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