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.

I have:

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 #1:

Video #2:

Video #3 - Bookcase Closed vs. Open (only 2 switches tripped in Open vs. 3 switches in Closed):

Video #4 -

Does anyone have a good, solid picture of the "A" stationary target and its wiring?

You each get $50 for coming up with this together.

The fricking diode was on backwards......

Took me a week, countless hours of frustration, more tests than I ever thought I would learn how to perform, and $100, but now I have learned two very valuable lessons:

1. Don't overlook the most simple stuff.
2. Bring out triple digit rewards, and the good ideas come out of the woodwork.

Both of you, please PM me your PayPal emails. I'm a man of my word, and I will happily pay up.

Pinside+ donation made!

Thank you, everyone : ).

This was the picture of the old switch that verified the diode was backwards. I compared it to the one I put in...man....last year right before I deployed for 6 months - hence - why it seemed to appear out of nowhere.

Man, can't believe I did that....

Learn from me, everyone - DOUBLE CHECK your work....

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Truth be told, I think I also had the wires on the wrong blades on the switch, so I was totally hosing myself. I took pictures from last year, compared wht I had to what was in that picture before I had to change the switch, and got both the diode in the correct orientation as well as the wiring on the right blades.

I need your PayPal email : ).

PM'd you waiting for your Paypal addy. I'll happily take care of you as you did say exactly that.

I keep my word.

You're going to have to walk me through what you want. The diode on the switch in question was soldered on wrong by me. I reversed it to the correct orientation per my photo from the original switch last year, and all is good. My initial soldering of the diode occurred nearly 10 months ago before I deployed, so my machines were in storage and this "seemingly new" problem was present since last year, I just didn't know until now.

What exactly do you want me to do? I need a walk-through. Please remember, my knowledge base is not as advanced as yours, and common knowledge/procedures to you may be unknown to me.

You were correct. The problem was I didnt compare pictures from June 2019, as I had forgotten about them.

Big oversight.

Man, that was fantastic. Well done - thank you for taking the time to do this!