I have a Big Guns, and a couple of months ago the center drop on the right bank stopped registering. It works occasionally, but most of the time it just won't register. This is both in-game and in the switch test. I recently swapped the board with the drop target board on the left, and the issue moved with it to the left center drop, so I know the issue is with the board itself and not the cables or anything like that.

I've tried reheating the connector pins on the board and the center opto component, but that hasn't made any difference. I'm not really sure where else I could try, although I did notice an inconsistency while probing the board with a multimeter. I don't know much about electronics so I don't really know what I should be looking for, but I do know that an inconsistency can be a sign of an issue.

Basically, while probing the board, I noticed one component measured about 21 for the left and right drops, but 26 for the center. I've included a pic of the component that measured differently circled, as well as a photo of the settings I was using on my multimeter.

Should I replace the component, and if so, where can I find a replacement?

PXL_20210605_214205229~2 (resized).jpg
PXL_20210605_214157436.MP (resized).jpg

What are the headers? I've already reheated the connector pins for both plugs if that's what those are.

Okay yeah, I already reheated those. Didn't make any difference. The plugs did fit a bit more tightly after doing so, but otherwise the issue still persists, and is still intermittent.

Can anyone tell me what the circled component is? I'd like to try replacing it, but there's no assembly info for this board in my manual. If it doesn't fix the problem, then I'll probably just buy a new board, but since I can probably buy that component for super cheap I figure it's worth a shot.

Thanks, but I've already tried those things as well. The issue definitely seems to be a bit more complicated.

Well, now I'm not really sure what to do. I received the new resistors I ordered but upon probing the board again all three resistors now measure at about the same value, 27k, which is what they should be according to the manual (The center one measures at 26.9k but that's still close enough right?). I have no idea how I got 21k on the left and right resistors the first time I probed the board. I'm kind of tempted to go ahead and swap the resistors anyways now that I have extras, but I really don't think it would help. Does anyone have any more ideas I should try before I just buy a new board?

Got it working by replacing the opto component on the opto board!