1 Topic by 314159

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Topic: Power supply polarity

Well, I did something stupid, and I'm hoping someone here can help me.

After being busy with other stuff for a few months, I came back to my Solidoodle 3, and the power supply immediately went pop when I turned it on.

I took it off to see if I could fix it, but didn't note the polarity, and I can't see it on the board.

I've now got a replacement 12.5A power supply, but I'm not sure of the polarity.
Could anyone with a solidoodle 3 take a look and see which is +v and which is ground?

2 Reply by ronsii (edited by ronsii 2013-12-14 01:49:43)

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Re: Power supply polarity

On my sang boards the blue wire is ground and is on the bottom of the board when it is mounted to the printer I don't have a printrboard in front of me so not sure if it's the same but if you have a ohm meter handy just check from part of the ground plane or usb shield to the power terminals and one will be a dead short.

3 Reply by adrian

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Re: Power supply polarity

It is "center positive".


In other news, its a 20v/10A rated jack, meaning its 200W rated. 12v/12.5amp means it runs at 150W, or 75% of rated max load...

4 Reply by 314159 (edited by 314159 2013-12-14 02:10:50)

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Re: Power supply polarity

ronsii wrote:

On my sang boards the blue wire is ground and is on the bottom of the board when it is mounted to the printer I don't have a printrboard in front of me so not sure if it's the same but if you have a ohm meter handy just check from part of the ground plane or usb shield to the power terminals and one will be a dead short.

That's what I need to do. Thanks!

I'm guessing later boards have a power jack, hence the 'center positive' comment.

Mine is like this.

http://www.solidoodle.com/wp-content/uploads/2012/01/Motherboard.jpg

Also, the power supply that came with it originally was 12V 12.5A. I'm doing a straight swap for the exact same type.

5 Reply by adrian

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Re: Power supply polarity

Oh, yes, sang boards are boring old screw terminals.

Yes the new printrboards have jacks.  I mistakenly believed you where referencing one of those.

6 Reply by 314159

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Re: Power supply polarity

And it's powered up again!

Thanks for your help, helpful people!

7 Reply by ronsii

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Re: Power supply polarity

Easy as Pie wink