Flip the dip switch back to its original state. The "switch guide" on the machine might be for another board. You can try to re-seat the connector on the board.

100% you don't see many machines that have the very first pcb still installled and when boards got changed over they almost never remove the original boards settings from the cab.
One thing to check and maybe replace is the connector, after 30 years the contacts are often corroded and this causes problems with game running.
I have seen heaps cause sync problems through bad connection.

One thing that always freaks me out is why did LAI mount their connectors facing upwards in their lowboy cabs?
The connectors always collect heaps of dust and when the moisture gets in they corrode.