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Capacitor replacement????

By D.C. ·
I have a KVM switch that blew a capacitor. I am looking for the replacement, but I lack the know how.
The specs on the bursted capactor are as follows:
220?F 16V
UEC
-40+105
It's girth is about the size of a straw and it's 2 cm long/tall. It isalso black with gray lettering and a gray stripe.
thanks in advance.

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Capacitor replacement????

by dmiles In reply to Capacitor replacement????

You have the know how and the answer in front of you,I also think you are offering to many points for your answer,You want to ask for a 220 micro farad capacitor@16 volt
Take the busted capacitor,with the info you have provided here in your question to a electronics store, radioshack or computer store,they will match the capcitor to 220mf 16V,this is the most important info you will need,you may want to write down the type of Switch you have and the model,they will be able to use a catalogue to Reference the capacitor part.

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Capacitor replacement????

by D.C. In reply to Capacitor replacement????

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Capacitor replacement????

by danpiers In reply to Capacitor replacement????

The capacitor you describe is called an "electrolytic" capacitor. The black stripe you speak of is the device's label to indicate its negative contact. That means the device is "polarized" and will not function properly (or even burst) if put inthe circuit with reversed polarity. You will have to look on the circuit board for an indication of the proper polarity hookup. Usually this is in the form of a circle, half black and half white. The black half is where the negative terminal (black stripe side) should be connected.
Any electrolytic capacitor of exactly 220 microfarads and at least 16 volts will do as a replacement. A 20 volt model will work the same as a 16 volt model. The voltage rating is simply the maximum the devicecan be exposed to without getting damaged.
The real issue you have to deal with is WHY did it burst. Often, another part failed and, in turn, caused the capacitor to fail. If you want to install a replacement, you will have to solder it in. Ifyou don't know how to solder, or don't have a lot of experience soldering, get a friend (who is experienced) to help you. If you have to resort to having to pay someone to do it for you, it will probably be cheaper to get another KVM switch. Good luck.

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Capacitor replacement????

by D.C. In reply to Capacitor replacement????

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Capacitor replacement????

by richard_barsby In reply to Capacitor replacement????

Hi both the above are correct but be sure as to the polarity markings the marking on the pcb is silk screened on and on far eastern products the -ve is silk screened in white if you are not sure check to see if there are other electrolytic capacitors on the same tracks and look at the polarities. The other point to note is that the capacitor in your KVM had a upper temperature rating of 105deg C which might suggest a high ripple current rating especially if it is on the output of a switchmode power supply this needs to be taken into account if the new cap is to last for any period of time make sure that there are no faults which caused it to **** the first time.

Best of Luck

Rich

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Capacitor replacement????

by D.C. In reply to Capacitor replacement????

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Capacitor replacement????

by donmars In reply to Capacitor replacement????

Bravo.... all three excellent answers!! Yes I am an electronic technician and it appears these guys know what they are talking about!
The main things are 16 volts and up, the same 220 microfarad, observe polarity (most times in quality circuit boards all the components will be oriented in the same direction.. so observe where the plus points to on the other caps, if they all point in the same direction then it is a good bet to install yours the same way. Dan makes a very powerful observation however.. "The real issue you have to deal with is WHY did it burst. Often, another part failed and, in turn, caused the capacitor to fail." You should be very aware that there could well be some other component failure, defective diode or some over voltage situation. I think you will however, discover as we all have, troubleshooting can be fun!

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Capacitor replacement????

by D.C. In reply to Capacitor replacement????

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Capacitor replacement????

by JustinF In reply to Capacitor replacement????

Excellent answers, another point is that the electrolyte in these electrolytic capacitors tends to dry out if it is running in a very hot environment and this changes the capacitance of the device which may have caused it to ****. It may be worthwhile replacing other capacitors that are close to the one that blew, especially if they are filtering the output of a switching PSU.

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by D.C. In reply to Capacitor replacement????

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