Power Supply Unit

[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
Regards

[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 ...

[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;

[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!


-F_D

[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.

[etiennel22]

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!


-F_D

There is 2 wires from it going into the PCB

[Jaws]

You are correct it's a
Bussmann fuse




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[etiennel22]

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

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[ChrisF]

buy a couple ..... the fuse is not the problem - just an indicator of the actual over current .....

[Stef]

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

[etiennel22]

+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

[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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[Stef]

Sounds like you have a dead short somewhere between L -N.

[etiennel22]

Anyway to determine where that would be?

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[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

[etiennel22]

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

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[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