Subject:
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Re: Board not responding
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 23 May 1998 15:35:54 GMT
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Original-From:
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Wong Sy Ming <smwong@post*stopspam*1.com>
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Reply-To:
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smwong@post1.com^avoidspam^
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Viewed:
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3483 times
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Mark Sokhwee Kim wrote:
> Hi!
>
> The handy board was working good before
> and I haven't used the board for a while.
> Recently, I ran the downloader few times,
> but I couldn't download the bootstrap.
> I think the download mode is ready, but
> the error message like "Board not Responding"
> is repeating(I know the downloading procedure).
> I believe there must be something wrong on chips.
>
> I remember one time I got a short around the reset
> switch while I was measuring the current. I still
> wonder why a short was made on the reset switch.
> There was a confusing LCD readout like blinking
> few times. Since that time, I could use it without
> any trouble till now.
>
> 1. Any possible way to check that some chips are
> not properly functioning?
> 2. If U1 is wrong, any handy source for
> purchasing U1?
>
> Best Rerards,
>
> Mark
The most probable cause of this is a dead 6811. (it spoils rather easily...
:(Because everytime i have a problem with the board, it turns out to be
nothing more than a shot 6811. Even replacing the 7805 with a LM2931T kills
it.
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Message is in Reply To:
 | | Board not responding
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| Hi! The handy board was working good before and I haven't used the board for a while. Recently, I ran the downloader few times, but I couldn't download the bootstrap. I think the download mode is ready, but the error message like "Board not (...) (28 years ago, 23-May-98, to lugnet.robotics.handyboard)
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