All right, I've gone a week trying to fix this issue, so now I'm opening it up to everyone. $100 via PayPal if you can help me find the problem(s).
Problem #1. When I am playing TAF, if I hit the "A" in mid-game, the game triggers BOTH the "A" switch and the #4 Opto in the Bookshelf.
Problem #2: When the center trough switch has a ball tripping it, I get switch 12 "Not Used" tripping on its own.
1. Performed PinWiki 6.24.3 Switch Matrix Problem with the jumper wire and triggering the switches one at a time. Doing that, all the switches function correctly one at a time. This is evident in video #2 below.
2. Swapped MPU boards with BSD to make 100% sure it wasn't a board issue.
3. Swapped 7-opto boards with JM to ensure it wasn't an issue there.
4. I have clipped one end of each diode of the switches marked with green circles in the below image. All measure 0.480 - 0.720 volts and operate properly when the test leads are swapped. All of the same switches function properly when triggered by hand (except of course "A" and Opto #4)
5. I have swapped the "A" target out entirely with a new switch and new diode.
6. When the center trough switch has a ball tripping it, I get switch 12 "Not Used" tripping on its own. I have swapped the "center switch" with another one of the trough switches to see if the problem followed the switch to its new location. Nope - stayed at the center switch. Reference video #4 to see what I am talking about.
7. I have pulled nearly every molex/IDC connector off the power driver board and underneath the PF in so many combos I couldn't type nor remember them all.
8. I have check the diodes for each bookshelf switch - both read solid readings and operate as expected.
9. I re-soldered the leads to the bookshelf optos on top of the bookshelf - no change. All wiring looked ok going to the PCBs as well as underneath the bookshelf assembly.
I dunno what else to check. I really feel like I've run the gamut of possibilities. So, if anyone can suggest something to me and TELL ME how to do it if I ask "how?", $100 is yours. I have all the usual tools including a brand new logic probe, DMM, soldering iron, etc.
$100 - on the line, AND I'll make a Pinside+ donation.
Let's see who can get it. I'll be honest, I am eager to see who can find this issue. I don't mind repeating the things I have already tried - maybe I performed those tests wrong. Fact-check me if you think I might have done it wrong.
YT videos in chronological order of troubleshooting the problem. All of maybe 8 minutes combined:
Video #3 - Bookcase Closed vs. Open (only 2 switches tripped in Open vs. 3 switches in Closed):
Video #4 -