Subject:
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Handy Board - Interface/Charger Board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 12 Jun 1997 16:57:53 GMT
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Original-From:
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Robin F Beggs 803282-9245 <beggsrf@bowinc.{IHateSpam}com>
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Viewed:
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1437 times
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Hi,
I have started a project to build a Handy Board and everything was
going fine until I started checking voltage in step 3.2.2. I get
around +5 volts going from pin 2 of U16 to pin 7 of J9. Also, when
checking pin 6 of U16 I'm getting nothing. I read through the FAQ's
and found this :
> OK, well I think it is isolated at the pseudo-MAX232 chip. Did you
> get the +10 v power supply pin on the p-MAX OK? It's at pin 2.
> Measure it w/r/t ground and you should get +10v.
>
> Before you order a real Maxim, check the polarity of your
> electrolytics. Also, it is possible that one of them is marked wrong.
> I have seen this---electrolytics with their wrapper on backward so you
> install it wrong. I am not kidding.
>
> Measure the voltage across each of the 10uF electro's. Two of them
> should have 5v across their terminals, two of them should have 10
> volts.
>
> -Fred
I checked this and got 5 volts on all but C11 for which I got nothing.
I checked the polarity and they look right according to the wrappers.
Robin Beggs
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