Specs seems to say the Namco 246 system and Tekken 4 output both 15 and 31kHz. Not sure if you can set the game to one or the other, or if it uses both for FMV vs in-game or what.
So, yer, more info pls. What make/model of monitor is in the cab? How is the picture rolling, vertically, horizontally or diagonally (both)? What PC hardware, OS and software are you using? What type of RGB cable, what connectors, and wtf is a Jamma(b) card?