I've been given a friend's Oxo to sort out after he decided to overhaul it himself.It was completely dead after years of storage in a damp outbuilding!
Aside from his extensive use of WD40 everywhere, the cleaning and adjusting of every switch in sight, including distmantlng the score motor and just about wrecking it, ( he didnt touch the head, fortunately) I have persevered with it and now almost have it running.
I don't have a schematic for it, most labels to identify various relays etc are missing and the wiring has heavy fade too. Apart from that, it's a nice machine...
So here is what I've done: pulled the motor board out, cleaned with alcohol all the switch blades, checked them over and re-gapped accordingly. Motor stacks, steppers etc done in the same fashion. All these appear to be correct in opening and closing nicely. I discovered the that ball trough switch was distmantled though because one switch blade was cracked, so I've rebuilt that . That was the only apparent issue where something obvious was broken.
So here is where I am with it: With credit on the reel, it won't start up. It will start up,for one or multi-players if if press the front door coin entry switch. All reels reset, the ball is served and it will play well. If the ball goes into either side hole, the ball scores and rejects the ball back into play. If the ball drains, it serves it up again, until game over. It still wont start a new game unless I do as before.
However, I have noticed that if the ball goes into a side hole, or drains it won't eject the ball unless the motor is running. During game play, as the motor is kicking in and out, that's why it's serving the ball, but if the motor has stopped, the eject cycle doesn't happen. I have also noticed that if the motor runs and I hold the start button in, the game will start correctly.
As I say, it's a miracle I've got this far with it after some 2 full days of cleaning it all and re-gappimg everything but with the absence of paperwork and missing labels, it's hard to identify what is supposed to be what. I keep.
wondering if that broken ball trough switch might have something to do with it but it looks correct. That was the only obviously thing wrong with it.
Edit: I've noticed that there is a schematic to view on ipdb so I'll try and print that off. I can then try to identify the relays e.g. by their coil numbers as they are still present, save for the hold relay. The faded wiring colours will be the biggest issue!
Any thoughts or suggestions welcome!