Tracball doesn't work in the down direction.

MC35

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Donor 2011
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I just installed an older used tracball in a 60 in 1 I built. I don't know if it worked before. All other directions work fine (at least in the setttings menu). I am guessing I wired something wrong, but it doesn't make sense to me that up would work but down wouldn't because they use the same encoder wheel. Could the encoder board be shot or am I right in my suspicions that I have a wiring problem.
Any suggestions?
 
The trackball should have two optic boards (one per encoder wheel) - try swapping them to see if left/right work with the (current) up/down board.
 
switched the boards around and the problem followed the board. Any place I can get a replacement encoder board or the photo transistors on the board?
 
again thanks for the help. I was confident in my wiring. The only frustraing thing is, a wiring problem is a much cheaper fix. Oh, Well, it is what it is.
 
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