It turns out that I looked at this and determined the problem to some certainty:
Using a volt meter, and checking pins 3 and 4 with the robot ON, I was able to tell that there was no voltage going to the sensor. I set the screen to "View" > sensor > port # and checked the voltage. On a good robot, I get near 4.5V. On my suspect robot, I get 0.02V.
Have any of you ever repaired a problem such as this?
Just sharing my experience with you, and looking for next step.
Donald Williams P.E.
Phoebus High School
100 Ireland Street
Hampton, VA 23663
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