Hi

I have 3 switches that don't work on my Bally Strikes and Spares. They used to work, and then just stopped. They are adjusted fine and clean. The B center rollover, the Spinner and the S target. These seems to be different cabling interconnects J1 and J3 going to q34, q51 and q54. This machine had a good amount of acid and water damage on the mpu lower left corner that was my first attempt at repair and it has worked for a year. Everything else on playfield works, I can play a game despite these features recently failing.

Could this be diodes, on each switch? What is the common denominator between these items?

I have not repinned the board as it worked without.

Thanks for any ideas.

Chris

May have answered own question, but unsure what the fix is. Switch matrix says I0 54 A4J2-8 controls b top middle rollover, spinner, s target and the pin 1(so it must be broken as well). So that is what they have in common.

15221189008211288085183 (resized).jpg