Long story short, this started on with a (Check Fuses F115 and F116, J112 Opt board error)
- I have cleared all of this now and am at the current issue where two balls are ejected at the start of a game.

The Ball 4 Opto is definitely the issue but I can't find the root problem.

#1) I used a switch matrix tester that I have and the switch matrix works 100% (It tests directly at the MPU)
#2) All of the LED's in the through trough are working
#3) I swapped an unused opto with the #4 opto and it still doesn't work.

My main first question is, can I "jumper" anything on the A-14977 7 OPTO Switch board to see if the issue is on it?
- My concern is properly jumpering and not frying something.

Has anyone done this? Thanks in advance for support and thoughts....
NOTE: Stock image, not my opto board
A-14977 7 Opto Switch (resized).JPG

Bump….

When I set it in switch test mode, opto 4 never shows closed. All the other opto’s respond. I was assuming that because opto 4 didn’t respond it was causing the 2 ball isssue. Might be totally wrong with my analysis….

Appreciate the comment, I think you can get to close to an issue and be totally blinded by the real problem

SIDE NOTE: of all of my machines, I have spent more time working on RS than all the others combined!

One additional data point. It is a 4 ball game. If I take one ball out the game plays fine. Doesn’t kick out two balls.

Does that provide any additional insights to anyone?

Help?..

Interestingly enough, it doesn’t give a missing ball message and from what I have read the game can be played with 3 balls.

I don’t clearly understand the small board that runs the opto’s. (See photo in thread) I am trying to understand a way to fake it out (with jumpers) and see if everything works from that board back.

Just needed someone else to make me think differently. You are 100% correct. I found a white with green trace wire that was cut. It appears to be the root issue! As I discovered it, I found 4 wires in the exact same area frayed. The were pressed into a connector for Ted’s dozer plug and they look all really bad. It’s gonna take me an hour to clean it all up and was too tired tonight. Will give a final post once done but shout out to The Pump House for the suggestion!

Just to close it out. I replaced the connector at Ted’s dozer. That is where the wires were broken. The flakiness of the dozer was related to this plug having issues as well. Everything back to 100%.

No on to my BabyPac man. It has some intermittent issues as well plus I have a new playfield overlay for it,

Full time job keeping the home machines working

38B6D8FB-E0CE-465A-85A7-E20735136041 (resized).jpeg