Image scrolling on DK Cocktail system

MonkeyMan

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I have a Donkey Kong Cocktail system that will start scrolling the image upon startup. I am able to set it and center the image but it will slowly start moving again and speed up until it is set back again. I checked the EPROMs and the connections and everything looks good(to me) Any advice on how to resolve this issue? The movement is mainly left to right although I have seen it revert to right to left. (This is the 4 board system)
 
I have a Donkey Kong Cocktail system that will start scrolling the image upon startup. I am able to set it and center the image but it will slowly start moving again and speed up until it is set back again. I checked the EPROMs and the connections and everything looks good(to me) Any advice on how to resolve this issue? The movement is mainly left to right although I have seen it revert to right to left. (This is the 4 board system)

Most likely you have a bad pot on the monitor but you can try either hitting it with some electrical cleaner in hopes the contacts clean up or just install a new pot.
 
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