Subject:
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Re: WARNING: +5 supply exposed
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 14 Sep 1998 17:25:20 GMT
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Original-From:
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Jeroen van der Vegt <a.j.vandervegt@its.tudelft.STOPSPAMMERSnl>
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Viewed:
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1311 times
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I got my PCB from Miranda Robotics (mail to colin@prospero.u-net.com for
more information) in England, and the trace is fully covered. Apperently,
not al HandyBoard PCB's ar exactly the same.
Thanks for the tip anyway.
Jeroen van der Vegt.
> Take a moment to look at your Handy Board. There is a thick trace • along
> the top, right and bottom edge. This is your regulated +5 line. Now look
> very closely at the outer edge of this trace. It should be completely • green
> (covered with solder mask). I discovered that on my board there is a small
> portion of this trace exposed on the outer edge all the way around. If • yours
> is like this, I recommend that you paint it all around with enamal paint.
> This edge is most likely to find something grounded.
> I was doing an experiment with my board which involved monitoring the
> NiCd battery voltage while cycling a motor. I had the volt meter alligator
> clipped to the stub of wire extending from the battery compartment. While • I
> was removing the + lead, it brushed for a second onto this exposed +5 • trace.
> The very bright LED was my first clue of the problem. The blank LCD was • the
> second clue. the Pcode loader still says the board is working, and the • LEDs
> cycle properly, but the LCD appears to be gone. I'm still checking for • other
> problems.
>
> Hope this can save some boards,
> Pherd
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