Subject:
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Re: Charge polarity on each board opposite?
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 29 Aug 1996 12:52:28 GMT
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Original-From:
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Mike Ross <mross@outland{spamcake}.jsc.nasa.gov>
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Viewed:
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1501 times
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On Wed, 28 Aug 1996, Fred G. Martin wrote:
> the hb has a diode to protect against reverse polarity at the coax
> jack on board.
Do those two boards (Hboard and I/F) have differing requirements of the
transformer charge plugs, as the schematics indicate? I have so many
wall-warts around, DC and AC, but they all have the return line on the
outside. Perhaps it doesn't matter, I don't have the schematic in front
of me here.
> maybe you just blew your config register. the ic manual for the hb
> has instructions on using the downloaders to reburn the config.
Great idea, I went and tried that. Alas, no. I downloaded the pcode
config0C.s19, got nominal responses, yet LCD's still all bars after
resetting board, and IC then cannot synchronize. Actually, LCD is bars on
the top row all the time now. Odd that the pcode downloader works, but IC
cannot synchronize. A brief examination of the board showed no burnt
areas or obvious damage. Right before it died, I noticed the regulator by
the polyswitch fuse was quite warm, which I don't believe it did before.
The motor driver circuits are unused. Any thoughts? TIA.
-mike
* Michael L. Ross/C33 | Lockheed Engineering & Sciences Co.****
* Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77058*****
*(713)333-7094 voice,(713)333-6071 fax*#include <disclaimer.h>*
* Finger me for my public key. mross@outland.jsc.nasa.gov ****
* If you weren't a socialist in your twenties, you had no heart.
* If you weren't a conservative by your thirties, you have no brain.
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