Hi I just picked up a Nintendo Vs. Cabinet today. Pretty sure it started out as either a Mario Bros unit or a DK unit, but now has a Dr. Mario pcb. So I'm almost positive it's the Sanyo EZ20.
Anyways, everything is working great except that the screen is scrolling vertically. Now, I spent a good 30 mins or more adjusting that dang vertical-hold knob, but it's super sensitive. Sometimes I can get the screen to hold position, but usually it's off (ex. the top half of the screen is cut off and loops on the bottom.) Then if I bump something in the machine it'll throw it off and will start slowly scrolling again. It shouldn't be that touchy right? Should be a lot more forgiving, no?
What would cause this hyper sensitivity of the v-hold? I looked at the flow chart, is a cap kit really the solution? Other than the vertical scrolling I think the monitor is decent. There's a tad bit of distortion, maybe the top 1/4" of the screen, but the colors and such look fine. Is it possible that the pot is corroded or something? Maybe the sync connection wiring is bad? How would I check that?
I'm completely new to the innards of arcade machines, so I'm just looking for some guidance! Thanks for any help you can give!
http://forums.arcade-museum.com/showthread.php?t=95388 It looks like he was having similar problems, not sure if that helps at all?
Anyways, everything is working great except that the screen is scrolling vertically. Now, I spent a good 30 mins or more adjusting that dang vertical-hold knob, but it's super sensitive. Sometimes I can get the screen to hold position, but usually it's off (ex. the top half of the screen is cut off and loops on the bottom.) Then if I bump something in the machine it'll throw it off and will start slowly scrolling again. It shouldn't be that touchy right? Should be a lot more forgiving, no?
What would cause this hyper sensitivity of the v-hold? I looked at the flow chart, is a cap kit really the solution? Other than the vertical scrolling I think the monitor is decent. There's a tad bit of distortion, maybe the top 1/4" of the screen, but the colors and such look fine. Is it possible that the pot is corroded or something? Maybe the sync connection wiring is bad? How would I check that?
I'm completely new to the innards of arcade machines, so I'm just looking for some guidance! Thanks for any help you can give!
http://forums.arcade-museum.com/showthread.php?t=95388 It looks like he was having similar problems, not sure if that helps at all?