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I think its more likely to be the opto receivers on the reels, that are notoriously unreliable with the age they are

Good evening. I am as disappointed as you are. 🙄

OK that looks good. Back to the drawing board??? (reprendre tout à zéro)

Good morning, gentlemen. Thank you so much for your patience with this problem. I really have. I took the requested measurements, and here they are. The photo shows what I get with the oscilloscope on each output when I activate a switch. The diagram shows the voltages and the corresponding switches. Note : The voltages are slightly different because I used a different multimeter. Thank you for your help.

Thanks Andrew, this one is a real head scratcher for sure. I doubt it's got anything to do with the switch matrix but I'm really just trying to eliminate everything I can think of, and anything I can't?

Welcome to the site. Enjoy your time here. You sould also have a look at this website. https://www.desertislandfruits.com/forum/index.php

Welcome to the site. Enjoy your time here. You sould also have a look at this website. https://www.desertislandfruits.com/forum/index.php

Welcome to the site. Enjoy your time here. You sould also have a look at this website. https://www.desertislandfruits.com/forum/index.php

Welcome to the site. Enjoy your time here. You sould also have a look at this website. https://www.desertislandfruits.com/forum/index.php

Welcome to the site. Enjoy your time here. You sould also have a look at this website. https://www.desertislandfruits.com/forum/index.php

Welcome to the site. Enjoy your time here

Welcome to the site. Enjoy your time here.

Welcome to the site. It would be great if you could upload some photo's of the machines you own

Hello kevin. Welcome to the site. It would be fantastic if you could uplopad some photo's of the machines you own.

with all switches off, and nothing connected to the orange and black 15 way switches connector, all inputs to the 4049 will be high (near 5v) so all outputs of the chip will be 0v. when a dil is on, it is allowing a pulse through to the input of the ic, this you cannot see on a meter, on a oscilloscope you will see it, the output on the chip from that line will be a exact inverted waveform

Thanks for letting me join. Got a couple of fruit machines, a crazy fruits club and a Thunderbirds club.

Good evening. I misunderstood. Sorry. it's sometimes the weird translation Do I need to remove the DIL switches SW1 and SW2 and take the measurement again? or SW1 et SW2 position ON ? Thank you.

Is that with no DIL switches set to on?

Hello So, I took measurements on IC22. I'm getting 4.44V at the input and 0.9V at the output. Except on pins 11 and 12. There's 3.8V at the input and 1.5V at the output. Could I have a problem there? Everything is disconnected; no switches; no lamps... To try it out, I also used a logic probe, but I can't interpret the results correctly. I'm not very good at this. Thank you for your help.

👍 Thank you very much jimxxx. It's not cheap but these bulb hoders seem to be rare.

There is a listing on Ebay for them, around £8 for 5 but cheaper if you buy more and postage combined, Maybe cheaper else where but not seen any, other than that someone on here may have some. https://www.ebay.co.uk/itm/225459730361?var=0&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338590836&toolid=10044&loc_physical_ms=41413&customid=6599bc59b0bf1594cd17d578665b7886

Thank you midibob. Now, Ihave time to sort out some details and the first one is that many bulb sockets are broken and I would like to know if anyone knows where is it possible to buy new ones. Here is a picture of a broken one.

Hi all, I started a collection as Im a big fan of old arcades i own a few others like Hydro thunder Sit model. also a Tetris payout system under MPU4 i joined here to hope to learn much and be able to bring this one back to full glory

Wow this is turning into a bit of a head scratcher. Can you check all the switch ports are OK? All the inputs to IC22 should be 5v with no switches operated. In which case all the outputs should be low.

Hello I'm back with an update. The oscilloscope arrived, I quickly got to grips with it, and here are the results in photos. IC 10 Pin 3: I'm getting a 514 Hz square wave. IC 18 Pin 12: I'm getting a 100 Hz square wave. And the third photo shows 100 Hz on R83; just as an example. This one isn't a square wave. If you have any other ideas, I'm all ears. In any case, thanks again for your patience.