Hmmm.....
Starting to wonder if it even has the right power supply in it ? 
Is that one the same as yours dealers choice ?
If not are you able to take a pic of your please 
Welcome to the world of project pinballs.
That's the wrong power supply. 500-5000-00 is an early power supply (alphanumeric) definitely not suited to your machine. you need a 500-5047-03 - which is the last used for this platform. I've seen early power supplies modified, and they seem to work. Check the cabinet wiring to the DMD as I believe that in some cases the AC HV return is changed at CN1. Just double check with the schematics AFTER you have decided to replace the power supply with the correct one. rottendog made a solid board compatible with this game.
CN3 - is just some funky wiring - a hack, or shortcut, rather than a repair !
