Missile Command Please help!

sleepygtr

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I am having an issue with my missile command (regular cab) and the trackball pointer. Cursur goes left and right, no problem but only goes up, not down. When the cursur gets to the top of the screen it blinks as if it is having draw in issues. I took the optic boards off the trackball and swapped them to make sure it was not the board - these checked out fine - with the swap - same problem. I tried the dipswitch setting with #4 on and off and no luck. Any ideas what I should do next? I also wanted to note 2 things: 1) I have a Braze Multigame installed that gave me trouble in the beginning, but i self tested and saved settings and never had an issue again and 2) I wanted to note that the game was left on for about 4 hours before this started happening. Vert hold went crazy, I fixed that with a simple monitor adjustment - and trackball issue started then too and is unresolved. HELP!!
 
It sounds like a PCB issue. Can't be the optic board as you say that when they are swapped the problem remains. Don't think it's a connection issue either, as I think the PCB takes up/down on just one pin, and you say that up still works. If you're sure that there's nothing mechanical preventing the trak-ball roller from spinning in the down direction, then that only really leaves the PCB.

The second post in this thread might help: http://forums.arcade-museum.com/showthread.php?t=154123&highlight=missile+command

BTW, every MC PCB that I've ever had has displayed the same symptoms as yours re cursor blinks at the top of the screen – so that's not likely to be a factor.
 
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