Power Supply Unit

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etiennel22
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Power Supply Unit

Post by etiennel22 »

Good day,

Hope anyone can help me.

Does anyone know what this brown round thing is? after some googling I think it is a fuse.

It is from a 12VDC 3,2A UPS Power Supply Unit.

Thank you
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Re: Power Supply Unit

Post by ChrisF »

do you have a photo from a different angle ?

typically capacitors that release smoke .....

but I dont see any "farad" value .... but then again very often components on commercial pc-boards dont display all info ...
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Re: Power Supply Unit

Post by etiennel22 »

I will upload another photo tonight.
But from what I can gather it might be this, http://za.rs-online.com/web/p/products/2260967/" onclick="window.open(this.href);return false;
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Re: Power Supply Unit

Post by Family_Dog »

How many wires from it? You'll have to look at the other side of the PCB for that. It looks more like a full-wave bridge rectifier to me, so will probably have four equidistant leads.

Whatever, it certainly looks like it is now "fused".

Edit: Aah, might be a Wickmann fuse!


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Re: Power Supply Unit

Post by Stef »

Looks like a fuse yes. Cylindrical (electrolytic) caps are normally used in power supplies are usually marked clearly ito Polarity as well and bulges at the top when blown.
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Re: Power Supply Unit

Post by etiennel22 »

Family_Dog wrote:How many wires from it? You'll have to look at the other side of the PCB for that. It looks more like a full-wave bridge rectifier to me, so will probably have four equidistant leads.

Whatever, it certainly looks like it is now "fused".

Edit: Aah, might be a Wickmann fuse!


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There is 2 wires from it going into the PCB
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Re: Power Supply Unit

Post by Jaws »

You are correct it's a
Bussmann fuse




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Re: Power Supply Unit

Post by etiennel22 »

So can I buy a new one and just replace it?

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Re: Power Supply Unit

Post by ChrisF »

buy a couple ..... the fuse is not the problem - just an indicator of the actual over current .....
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Re: Power Supply Unit

Post by Stef »

+1 Replace and switch on without load, if it blows again there is a short/faulty component on the board.
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Re: Power Supply Unit

Post by etiennel22 »

Stef wrote:+1 Replace and switch on without load, if it blows again there is a short/faulty component on the board.
Thank you, will give it a try :thumbup:
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Re: Power Supply Unit

Post by etiennel22 »

Got the replacement fuses. But as soon as I plug in the unit it blows again. So I guess there is something else wrong.

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Re: Power Supply Unit

Post by Stef »

Sounds like you have a dead short somewhere between L -N.
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Re: Power Supply Unit

Post by etiennel22 »

Anyway to determine where that would be?

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Re: Power Supply Unit

Post by Stef »

Easiest is to measure with a multi-meter to see if that is the case...then follow the actual tracks on the back to see if there is any obvious shorts like a piece of wire/solder or maybe against the enclosure when assembled etc.

With that eliminated, check the major components one by one
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Re: Power Supply Unit

Post by etiennel22 »

Will give it a go when I get a chance. Thanks

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Re: Power Supply Unit

Post by etiennel22 »

Finally got time to test the unit. So it seems the yellow Polypropylene Film Capacitor next to the Fuse is also dead.
Found a place that sell those capacitors hopefully I can get the unit working tonight. Holding Thumbs
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