Hey all! First time posting a thread and hoping the amazing community can help a first time EM owner out. I picked up a WPC OXO a while back and have been cleaning everything on it, as it sat in a basement for the last 30 years. Let me tell you, this thing was dirty. I got everything cleaned up (steppers, switches, etc.) and working except for a couple things:

First is the top center O and X switches dont seem to register. The contacts were cleaned with iso and a light “sanding” with a business card, and one was adjusted so that the contacts made contact when the ball rolled over the switch. Even after cleaning and adjusting, they still dont work. I cant imagine the leaf switches are bad, but I really dont know.

The second problem is that the pop bumper lights do not stay lit when the A and B targets are hit. The inserts and pop bumpers light for a fraction of a second and then go dark. Maybe I dont know how they activate?

Any help is greatly appreciated.

JAY

I did clean the jones plugs. I also used a wire wheel on my dremel. And I used a .17 cal gun cleaning brush to clean the female ends. I could try bending the female ones slightly and see if that helps. Now to figure out which ones need to be re-cleaned/adjusted...

Thanks for the tip on bending the female ones in just a bit to ensure a good connection.

Thank you for the help gents. I gently filed the contacts for the trough switch and it is normally closed, but opens when the ball is ejected into the shooter lane. I double checked the “A” and “B” relays and all those switches seem to be as they should. I attached a pic of the trough switch, the B relay and the A relay.

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It seems that the pop bumper lights do come on, but only for players 2-4 if you score 25K points. Still nothing on player 1 though. It also seems I have a score reel that doesnt want to reset on player 4. Pretty sure that just needs to be more thoroughly cleaned. I also have the left side rollover switch now not working. The switch is clean and functioning as intended. Wire connections seem good.

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Thanks again for the help dr_nybble and @howardr. It turns out one of the switches on the 4-X relay was open when it should have been closed. This fixed everything and it plays great! I guess it pays to go through all the switches twice, cause I swear I checked all those when I cleaned them.