Missile Command Trackball not working

SkippyJoe777

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Mar 10, 2010
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I have a Missile Command Upright that I just cannot seem to get the trackball working on. All connections are tight, dipswitch switch 4 is off, and the game passes all tests. I have a Missile Command Cabaret control panel and hooked it upand turned dipswitch 4 back on and the trackball doesn't work on the Mini panel either so I am assuming it is a board problem.

I have a spare non-working MC PCB that I can swap parts from if I need to. Is the problem on the board? If so, what would be the suspect componant?
 
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