Subject:
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Re: motor port problem .
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 19 Nov 1998 02:01:57 GMT
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Original-From:
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phillip chia <philchia@ANTISPAMsingnet.com.sg>
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Viewed:
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1637 times
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hi,
I have a big problem. I followed the method of yours that just lift up pin
8 of one L293
and wirewrapped it. The positive supply is wirewrapped to pin 8 . How about
the negative supply of the batteries should insert or wirewrapped? I
inserted the negative supply in the bottom row of digital input as ground
together.
Suddenly. after a short while, the L293 turn so hot. It burnt my hand.
Besides, the socket on the HD mounted with pin 4,5,12,13 of L293 has melted
in that particular area. Simply it is a plastic part. What is really
happens ?
Should I also wirewrapped the negative supply to one of the grounding point
pin of L293 ? By the way, If I cut the trace on HD, is it only cut the
trace to the positive supply only . How about the negative supply trace ?
should I cut? BEsides, If I cut, it there any way to mend it back to
originally ?
MOST IMPORTANTLY, Where should I cut ? Please show me the path? My proect
jam down here. I really in a rush to complete and submit the project .
thank you very much . Please reply asap.
rgds,
phillip
----------
> From: FThompson9@aol.com
> To: handyboard@media.mit.edu
> Subject: Re: motor port problem .
> Date: Tuesday, November 17, 1998 10:00 PM
>
> Philip
> I would first suspect that the motor chip has blown. This is eash • to
> check since the Handy board has two L293 chips. Swap them (disconnect • your
> motor connections) and run testmotors(). If the problem follows the • chips,
> replace the bad one. (You might want to buy a small stock of extra L293
> chips.) If the problem does not follow the chips, I would suspect the • 68HC11
> chip. You will probably need an osciloscope to be sure, but start at the
> inputs to the L293 and trace back to the chip to be sure of the signal • your
> getting. (There is a 74374 and 7404 that you will need to check. You • will
> find all this documented in the Handy Board Technical Reference manual. • See
> page 49 for details on the motor drive.
>
> Pherd
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