Subject:
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Re: HB
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 15 Jul 1996 02:15:59 GMT
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Original-From:
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Matt Harlan <mjh10@cornell.eduANTISPAM>
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Viewed:
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1586 times
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HI
Check for a short between pin 11 of the 'hc374 and +5V. Pin 11 is supposed
to be connected to pin 9 of the 'hc138. It is the select line for the 8
flip-flops in the 374. If you have a logic probe, check either of these
pins. They should be pulsing quite rapidly. If they're not, that's the
problem. When I power up my HB, all four red leds light and then go off.
If I short pin 11 to +5V, they all stay on. Check for the short first, if
that doesn't work send another message and I look for something else.
Good luck,
Matt
_______________________
Matthew J. Harlan
Cornell University
Electrical Engineering
mjh10@cornell.edu
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