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Does the speaker actually measure 30 Ohms (or near)? They are difficult to find!

Hello Regarding the sound, I do have 15V, but the speaker is dead. I connected a small speaker; I get some hiss but no beep. A 30-ohm speaker isn't going to be easy to find. 🙄 I'll keep looking and try to sort things out. Thanks.

Whoooo - oooo - ooo 👻 Better (absurdly) late than never! Incoming shortly. (Probably not worth the wait lol)

Wow! Just seen this. What an absolute gem of a machine. Good luck - would be lovely to see the old girl in action.

Hello. I'll take a look at all of that. Thank you.

For the sound it's worth checking that you're seeing the 15v on the collector of T11, if you haven't already. IC3 only delivers the basic sound bleeps, the main sounds come from IC2. Not sure which one supplies the error sounds? For the Hold button it's possibly one of the associated diodes in the switch matrix unless it's affecting other switches you may not have noticed yet. In that case it could be IC22 or one of the caps C24-28 going short. It's quite easy to fault.

Nice result and worth pursuing for such a nice old game

Good evening. Three problems remain to be solved. 1) The sound 2) The display 3) The hold function on the second reel I'll tackle them one by one. The sound: I replaced T11; no improvement. I'll look into IC19 and IC3. Have a good evening.

I am a new member and newbke to this, I am looking to start by fruit machine roms to my handheld powkiddy a12, could be possible? I hope I can custom it over time

Still not here yet! hoping in the next few weeks

Did it arrive ok, were you happy?

As they say... the end justifies the means.

A quick update, i thought i had got rid of this strange reset issue but alas i had not (well i have now). So running on the golden nudge it cart, 9 times out of ten when you got nudges it would work, however with its own nippy nudger cart it rarely would, normal gameplay fine but as soon as you nudged it would reset. Wiring between the two carts slightly different as it uses different lamp outputs for nudge feature and the coin lockout and one of the meters are swapped. Anyway by total accident i realised it was only when the four lamps in the nudge panel were flashing and you nudged it would reset, take the lamps out and it would be fine, now psu is ok all recapped and new regulator, 5.1v very steady but a 0.4v drop on the 15v (15.2v) when lamps flashing. I was only getting 8.6v across the 9.1v zener but that could well be within tolerance. At this point i cheated a little as the only 9.1v zener i have is a stud mount diode so i put an 8.2v zener in (i do recall Barcrest released some notes on MPU3 about changing the zener on low voltage sites, not that mine is low). It works fine now every time. So maybe it is an iffy zener transistor or resistor on the voltage sense circuit (i dont care now it works)

No, the congratulations are for you, the experts. I'll try to find the right diagram. Thank you. To be continued.

There are three different types of RESET circuit. There is pic of them in the downloads area somewhere and they are all different. Felicitations Lamiral.

Well done, you truly are the French Ambassador for Mpu3.

You'll tell me; look at your first repaired MPU. !!! Make some comparisons. It's back in its machine and working perfectly thanks to you. I don't want to touch it anymore. Okay, I'm going to investigate my problems. Thanks

Hello experts So, Bob is right. I installed the wrong component: T56. 🙄 I was really incompetent. This board has already been repaired, and the previous owner installed the wrong component, BC172. I always check the component and the schematic; and on the schematic, it's a BC172. Hence the mistake. Now it starts; yes; Bingo! 🙂 😀 Thank you; thank you again. But, well, there are some problems: The sound; I'm going to replace T11. The display is acting up a bit. One scroll bar is stuck in HOLD mode. And others... I'm going to check the connectors, the soldering, etc. Thank you very much.

I have a couple of motherboards on eBay just now I know they booted a couple of years ago

Hi, yes i did,my supposed working motherboard from flea bay had faults, one being and issue with the switch matrix ics u8 and u9 which were replaced but the fault causing the reset issue on mine was one of the FGPA chips (two square chips in the middle) having some dirt on one side of it and not seating correctly. That was what was causing my issues but there are a few faults that can cause reset problems on the board, processor pcb, sound pcb, voltage stability etc etc. I also recapped the power supply.

See if it boots without the sound card in

That's fantastic mate .thanks ever so much for the advice and very much appreciated 👍👍👍👍

Yeah there is design /edit mode config/ misc/ check the door invert tab, exit design mode machine will reset, hit test tab once for free credits and use the "nudge up button to nudge up (obviously) and the "save it "button to nudge down

same issue here. were you able to solve it?

T56 should be a thyristor? 2N5061 or 2N5060 at least that's what should have been removed. You had better check!