B/W Atari Soccer trakball rolls in wrong direction

halwriter

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Wondering if anyone has seen this problem on a trakball game: when I roll one particular ball really fast backwards, it goes forward instead. If I roll it very slowly, it goes in the correct direction. Changed the sensor card but got the same problem. Any advice and ideas much appreciated!
 

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Have you tried swapping the problem trackball with one of the working ones?

If the problem moves you'll know its in the trackball. If not its a board problem.
 
thanks, robotron

thanks, robotron; good idea. i couldn't duplicate the problem with another trakball. noticed some significant schmutz between the tines of the wheel and cleaned it out. now the trakball is working right again. maybe that was the problem, maybe it'll come sneaking back.
 
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