This may be your magic bullet: http://www.kahr.us/daughterboard.html $30 and your reset issues are likely solved.
(Topic ID: 183087)
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Bram Stoker's Dracula
Williams, 1993
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Quoted from mcklit:lyonsden Don't know what to think about this. I tend to think that it's a bit like fixing a flat tire by filling it with foam. It will get you running again, but who can tell with what possible side effects? The game was build to run without the "adapter" so I like to fix the root cause rather than fixing the problem itself.
The usual cause of the WPC resets is low voltage on the +5V going to the MPU board, which is VERY sensitive to low voltage. Kahr's board basically has a power regulator that taps into the system's +12V to create a new +5V current that goes straight to the +5V MPU board. Otherwise, whenever I get a WPC game, I replace the 5V voltage regulator with this: http://www.ezsbc.com/index.php/products/psu5.html and, while I have the board out, the +12 voltage regulator with this: http://www.ezsbc.com/index.php/featured-products-list-home-page/psu3-12.html. I also replace the capacitors as they only have ~1000 hours of life and most WPC games are in need of those.
Of course, I highly recommend going through pinwiki's breakdown of the WPC reset problem: http://pinwiki.com/wiki/index.php?title=Williams_WPC#Game_resets
However, if you just want to get your game up and running again, Kahr's board is the easiest way to go.
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