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Old 03-01-2012, 02:53 AM
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spalmer spalmer is offline
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Problem is likely U20 on the CPU board. Check for battery corrosion in that area. If it looks good. I would try replaceing that chip. Switch Columns are controlled by this chip. Again this is on the CPU board not the driver board. Also check check to Green wire with the yellow strip at connector j207 pin #4.

Another way to see if you have a board problem or problems elsewhere you would need

1. A jumper with aligator clips on both ends. (available at radio shack)
2. a diode. also available at radio shack.

Place the game into the switch level test on the menu. Remove connector j207 and j205 from the driver board. Connect one end of the jumper to pin 4 or j207. Next connect the other end of the jumper to the non banded end of the diode. Next touch the other end of the diode (the banded end) to the pins on j205 starting at pin 1. If the test shows you are closing switches, it is not a board problem.

Last edited by spalmer; 03-01-2012 at 12:35 PM.
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