I’ve got an Eight Ball Deluxe with a switch matrix issue that has me chasing my tail.
I have a typical phantom switch issue, but my attempts to fix it have not worked.
So, when the “2” target and “5” target switches are closed and the left slingshot is hit, it activates the collect bonus saucer. Whenever the “5” target and “6” target switches are closed, the left pop bumper fires. No other combination of switch closures on the target bank give me problems (i.e. 1-2, 1-3. 1-4. 2-1. 2-2. etc).
I removed J2 from the MPU and verified that this is not a board issue; no switches showed closed on the switch test.
I replaced the diodes on the 2, 5, and left slingshot switches with no resolution.
I replaced U10 on the MPU with no resolution.
I replaced all remaining diodes on the target bank with no resolution.
Where should I go from here?