Subject:
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Re: Expansion Board problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 10 Mar 2000 23:40:06 GMT
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Original-From:
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Gary Livick <GLIVICK@PACBELLsaynotospam.NET>
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Viewed:
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1074 times
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You have a short circuit somewhere. The first thing to check is to make sure you
have the capacitors in the right way. Some of them are polarized, and if you put
them in backwards, they sometimes short out, and sometimes they blow up.
The next thing to do is feel all the components on the expansion board and find
anything that is hot. Since you have a short (probably) something will be heating
up. Whatever it is may be very hot, so use caution.
If neither of these things work, take out all the IC's and the LCD, and start
reinstalling things until you find the thing that prevents you from loading the
pcode. That's the bad part.
Needless to say, be careful while doing these things, because something is pulling
enough amps to pull the voltage down enough that the HC11 won't come on line. You
don't want to smoke anything on the board.
Good luck, and be sure to wear some kind of eye shield for when a cap pops!
Gary Livick
Tiny HC11 products for your robot
http://www.teleport.com/~raybutts/
Alex Stewart wrote:
> Hi,
> Just finished my exp board, checked over all connections twice and looked
> for shorts, installed it, turned on the board and attempted to download the exp
> libs. Wellll when I truned the board on the LCD was just squares across the top,
> but the power light was on....tryed reintalling pcoder , no luck, so I removed
> the exp and turned it back on with the LCD on the HB and it worked fine and
> would talk to IC. Is there a special procedure for installing the Exp or and any
> suggestions?HELP?
>
> Thanx in advanve.-Alex
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Message has 1 Reply:
 | | Re: Expansion Board problems (Kinda OT)
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| (...) I was trying to build a 110V AC -> 24V DC power supply from Radio Shack parts once... It was late at night and I was tired. I only had a 12v transformer, so I pulled out an electronics book and build a voltage doubler on the output side of the (...) (24 years ago, 31-May-00, to lugnet.robotics.handyboard)
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