First hand experience for noting...
I had a bad/loose bulb #7 on my card display. So I shifted the screen as
I have a few times before to slide out the numbers card. I pulled and tested the bulb, it tested good.
So I cleaned the socket and got a little bit more tension on the tab reinserted the bulb, all good. I
then put every thing back in place and tested again... Ugh.. now I was getting multiple hole lights displaying
when a ball would land in certain hole pockets. WTH, an easy problem to fix just took a turn for the worse. After about
10 minutes of checking for a short on the back of the light display, I checked the alignment of the Magic Screen Disc,
well, I must have somehow got it out of alignment just a tad. Once I realigned the disc all card numbers display
properly and the screen moves right or left when needed.
That little mis-alignment really does mess serveral things up.