I started repairing pinball last year. This is my second EM. The first, VOLLEY, was 95% working when I got it, so there wasn't much to do. This one, OXO, was the opposite. It was almost completely non-functional. But through this great site and the wealth of knowledge it contains, I have successfully brought it back to life. I'm still struggling with reading schematics, but I'm getting there. So, I would like to offer up my repair notes here in hopes it can help someone else in the future. I also have repair notes for our BSD that I repaired last year with help from this site that I may post as well. Thanks.
Cleaned and adjusted all score reels, steppers, switches
Problem: Reset sequence not resetting all reels to 0.
Repair: Readjusted switches on problem score reels.
Problem: Reset sequence doesn’t shoot the ball from out hole. Essentially getting stuck on step 11 of the Williams reset sequence from the EM repair guide. The score motor keeps running.
Repair: Magic….After checking the entire path from the score motor to the transformer, Somehow hitting the plumb bob tilt to cause the tilt relay to activate then putting a ball in the outhouse fixed this issue. Perhaps a plate on a relay wasn’t aligned properly and that somehow knocked it into position?
Problem: 10 point relay, 100 point relay, 1000 point relay stays energized when hit. Coils stuck on chimes, No. Match Unit, and elsewhere.
Repair: Readjust switches on point relays. They were too close together to pulse properly.
Problem: Overheated coil on "No. Match Unit"
Repair: New Coil
Problem: Gate would stick open.
Repair: Disassembled and cleaned post.
Problem: Multiple relays buzzing.
Repair: readjust switches and springs to allow the relay to pull in effectively.
Problem: Points not displaying on reels. Even with manual activating of point relays no score would show.
Repair: Cleaned switches on TILT relay again. Specifically the two M&B.
Problem: 100 points not showing on any reels.
Repair: Readjusted 100 point relay switch for drum reels closer together.
Problem: Knocker staying energized when the ball rolls over right rollover after special lit.
Repair: Readjusted Right Rollover Relay.
Problem: Rollover Button not activating.
Repair: Traced it down to a wire that had come off of the Rollover Button Relay.
Problem: Sometimes rollovers won’t tally a score or light “x” and “o”
Repair: The long bar on the reset bank was slow to return to home causing relays to stick. The solution was to replace the spring on the reset bar.
Problem: “9-0” not lighting.
Repair: Bad LED bulbs. They may have shorted during a repair of something. I don’t know.
Problem: Flippers buzz in hold position even after rebuild.
Repair: I’ve tried a few things to solve this, adding a spring washer, readjusting coil stop, they still buzz.
Thoroughly cleaning and adjusting the switches on the relay bank fixed a myriad of gremlins.
I took a thousand photos of the repair, but I'll only post a couple. Thanks again. Now on to the next machine!