Subject:
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Re: handy board troubles...
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 22 Mar 2000 13:20:17 GMT
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Viewed:
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1443 times
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great, that's excellent!
the key trick was pulling all the socketed chips. it's a weird but
true fact that chips that don't have valid logic supplies can draw
power in from their inputs pins (when the inputs are high) and operate
off of that leeched power.
i've seen it before with the RAM.
fred
In your message you said:
> In lugnet.robotics.handyboard, Fred G. Martin writes:
> > that's possible, it's easy enough to test (just check continuity
> > across F1).
> >
> > more likely that U14 croaked. is there batt pwr on its input side.
>
>
> I traced the lack of power to a dead wire between C5 and pin 28 of U14;
> soldering a small piece of wire between these connections fixed it.
>
> Thanks, everything works perfectly now!
>
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Message is in Reply To:
 | | Re: handy board troubles...
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| (...) I traced the lack of power to a dead wire between C5 and pin 28 of U14; soldering a small piece of wire between these connections fixed it. Thanks, everything works perfectly now! (25 years ago, 22-Mar-00, to lugnet.robotics.handyboard)
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