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andy keptboy has loads of it or he did ... might be worth messaging him ?

hello and welcome

Good evening. So, here's the report about the sound. All the sounds arrive on IC19 Pin 2 and exit on Pin 3. The normal playing noise is a 781 Hz square wave. The alarm is at 3.13 kHz. There's no signal on Pin 1 of IC19. It might not be used on my machine. Anyway, the sound works, because I had T11 reversed. The old boxes are reversed with the new ones. What goes wrong, goes wrong. (redo) . 🙄🙄 Regarding the tubes, I think there's a small problem; but I need to check their operation compared to the other machine. For the speaker, I found a 50 Ohm resistor. If I remove the 27 Ohm resistor and bridge it, will that work? https://composantelectronique.fr/haut-parleur/716-haut-parleur-philips-50-ohms.html Thanks for sharing your knowledge.

I will message you

Yes that would be great ,how do I pay?

I could send you both for £18 posted

Thanks might be worth a try ,how much is it?

I have no idea sorry! Also I have no way of testing them, pulled from a box of around 50 displays I have

Would rev A work mine is rev B ,thanks

Got a couple

One for sale here https://tinyurl.com/23wpo8bs Seems quite expensive though?

1. F3 on the fuse board 2. Unplug all the lamp plugs and reboot, if still alarms with lamps disconnected change MPU. You'll probably need this if you change the MPU BKBD611N9561253.zip

I've got a beaky blinders, one of the buttons the £1 was broken, now i'm getting a MUX col err 32 happening everytime I turn on the machine. It won't go past the error. Anyone any ideas?

I've got a beaky blinders, one of the buttons the £1 was broken, now i'm getting a MUX col err 32 happening everytime I turn on the machine. It won't go past the error. Anyone any ideas?

Thanks that would be great

Will have a look tomorrow should have some

Good evening. Thank you so much for all the details.

I can't remember what the resistance is of the volume control pot but at maximum volume you will have approximately 60 Ohms load so half the power will be dissipated in the 27 Ohm resistor. I think the 10 Ohm is to stop the sound being turned off completely.

Hi everyone I looking for a display for Maygay epoch ,part no 16LF01UA4 rev B,if anyone has one for sale ,thanks in advance

Hello Thanks for the clarification, Bob. Your help is invaluable. I'll look into that. On another note, I have some questions about the volume control board. I've looked at the schematic and I see a 27-ohm resistor! It's original; not modified. Is this resistor related to the 30-ohm resistor of the speaker? And a photo of the series connection would be helpful. Thanks

Some extra info.... The game sounds and alarms originate from IC2 so should appear on IC19 pin 2. The reel alarm should be approx 1.5KHz but I have found that not all games will alarm without the green plug in??? In that case you might need to generate an alarm in a different way. Ordinary switch bleeps (not sure how that will translate) come from IC3 and they are approx 750Hz. IC19 pin 1. All waveforms are squarewave of course. Hope that's useful.

Don't think there was a pc92 game card as the rom mounted to the mpu. I have a sound prom card somewhere buried deep in the boxes of fruity stuff from a bullseye I scrapped.

It depends on what sounds are being generated. This isn't very helpful I know but as you have no sound at all it shouldn't matter. What you could try is to disconnect the green plug then switch on as this will generate an alarm. Then you can check all those outputs from the two chips to see which one (if any) has a waveform on it. If you can't find anything I'll set it up here and let you know for sure which chip sends the alarm tone. Putting two speakers in series is a good idea, just make sure you put them in phase.

Good evening. I need your opinion on a 30-ohm speaker. Since I can't find one, I was thinking of buying two 16-ohm speakers and connecting them in series, which would give me 32 ohms. It's also a question of price: €15 for the pair. What do you think? Regarding the sound itself, with an oscilloscope, should I find a signal on IC19 pins 1, 9, 10, and 13? Or not? Bob mentioned that it came from IC2 and IC3. Am I right or completely wrong? Have a good evening. Many thanks.

hello and welcome sean