Repairing a trackball

[mugwump]

I have a 3" Betson Imperial trackball that has started flaking out.  Rolling to the right results in almost no cursor movement while the other three directions work fine.  The rollers all work fine and I replaced the two horizontal directional wires with no luck.  Replacing with a new unit is out of my budget for now.  Any ideas what might be wrong and/or fixable?

[SirPeale]

Check for cold solder joints on the board.

[mugwump]

Thanks for the tip, I'll check that out next.  Boy, do I hate re-soldering!

[dabone]

Did you try inverting the optic boards?

I.e. take the one for vertical movement and put it on the horziontal.

That will tell you if its then encoder boards or the interface board.


Later,
dabone