Subject:
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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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Wed, 28 Aug 1996 16:55:24 GMT
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Original-From:
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Mike Ross <mross@*nomorespam*outland.jsc.nasa.gov>
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Viewed:
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1519 times
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Well, I finally broke it. My Handyboard has been a true workhorse,
so forgiving of my newbie errors, until now.
Mine has a 9.6V Nicad in the case. When I tried to fire it up last, the
battery was low so I plugged in the 12V DC supply line from the onboard
battery, which is grounded on the outside, not the center of the plug.
This might have been the first time I'd used the DC onboard supply rather
than the wall-wart transformer to charge the NiCad, I'm not sure.
Now I see the schematics show the charge plugs as being *negative
centered* for the Hboard, and positive centered for the I/F board.
Anyway, the robot jumped with a start (which could have been due to
transient radio noise when hooking up the power) and the Hboard LCD
display went all blocks across the first row. Now I can get dl to
download the pcode_hb.s19 file, but ic cannot subsequently synchronize
with the board, and the display remains all blocks across the top.
Now, the question: Are the charge plugs oppositely polarized? The Power
Supply Circuit schematic dated 11/30/95 shows that particular plug to be
grounded in the center, which is opposite to the I/F board supply and all
the wall-warts I tested. Is this just a boo-boo in the schematics?
I haven't started tearing the board out of the robot for a closer look
yet, I'm just looking for speculations on what might have happened.
Thanks for any and all neuronic activity on my behalf :-)
-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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