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Finding the right voltage?

PostPosted: Mon Sep 14, 2015 7:18 pm
by Clym5
Hey all,

I recently acquired a Datalogic SC8000 controller. Ex Air NZ I'm lead to believe. It needs a junction box to break out the connector on the bottom, which handles power, Ethernet and a few other things but I don't have the junction box (someone I know might have it though).

Does anyone here know a good way to determine input voltage for a motherboard? The specs say 24v but that's into the junction box. It takes the old style PC motherboard plug but with 3 red wires, one blank, and then two black.

Edit: removed image. It wasn't the same.

I'll put some pictures up soon as it's a really interesting device. Also, seems quite expensive... ... 1259654305 ... 0749785959

Re: Finding the right voltage?

PostPosted: Wed Sep 16, 2015 3:23 pm
by TheM
Looks like old style PC power supply connectors: ... html#oldpc

Re: Finding the right voltage?

PostPosted: Wed Sep 16, 2015 4:28 pm
by Clym5
On closer inspection, it doesn't physically match any of them.

Since this is an industrial board with no documentation that I can find (for the motherboard), I don't really want to try the magic smoke method!

Re: Finding the right voltage?

PostPosted: Thu Sep 17, 2015 9:54 am
by SpidersWeb
Follow a trace from the positive rail until you find components you can identify, and check what their ranges are. Eventually you'll come to a conclusion.

The breakout board looks like it may just pass the power through, and on the motherboard itself I see things like chokes and big caps - which makes me think it basically has a mini power supply on the board itself - so I wouldn't be completely surprised if it actually does take 24V and splits/regulates this to +12/+5/0/-12 on the motherboard.

But yeah, follow traces, look up parts. Capacitor ratings *can* help for evidence purposes too, generally a manufacturer wont use a big 50V eletrolytic cap on a 5V line for example. Good idea to check first, because chips don't like 24V generally lol