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Have an MPS machine here, and it won’t accept tokens. I’ve already swapped out boards with no change. i fitted a faulty PSU (no payout) but get INTERMITTANT token acceptance when manually flicking token switch. tried another token switch, no change. have since tried 4 PSUS and can only get the one mentioned above intermittently accepting them via switch, any ideas please? just to add, all make machine alarm when switch is held down, so machine knows it’s connected

Well there are some white wires on that board but not as many as on the main board, so once booted the hopper motor twitches which in turn triggers the error, I will check that hopper board tomorrow as for the mpu I replaced all the triac drive transistors already and the caps are all intact and not brittle, I’m still thinking the burnt resistor in the switch matrix has something to do with this !

Every day`s a school day, i was thinking it was a serial hopper but i see not now. Anyway back to the beginning to what Bob said about the capacitors, transistors etc underneath the battery (as the board is vertically mounted) they all do the triac drives which now we know (thanks Generation) that that is the hopper control board. So do the whites from the triacs go to that board.

Ah so is that for sure the hopper board ? I thought not, will have a closer look at it

You pictured the hopper board. is two types, rectangle and the more square version you pictured

Thanks can’t see a hopper board on this! Seems to be controlled by the game card as said above, and yes I need to be sure the switch matrix is good

Can’t see what error you have, but it’s known for the hopper driver boards to burn out. just like with solenoids, and battery leaks the payout constantly fires/spins. I would say concentrate on switch issue first as may be related to that, and needs to be fixed regardless

Just the one hopper Jim

Quick question, what make/ model are the hoppers / hopper?

Thanks for the input Jim, well it's good to get an understanding of how it works, let's hope it's not an issue on the card! Hope Bob can advise on the chip readings I posted earlier.

I think you are right on both counts. I have just had a look on one of mine and although it has not got a hopper it has got the extended game card and that square chip near the aux 3 connector on the game card is a 68681 DUART which makes sense, so power from pl10 and information from aux3 on the game card. So that is a dead end as none of the tracks that directly go to the hopper are anywhere near the battery area. As Bob says a screwed up switch matrix can make them do funny things and something else i would look at which realy can do strange things is the RAM, although it looks quite clean in the photo it is in the battery area.

Ok so had a look at what I thought was a hopper driver board but thinking it’s some kind of power board? It looks like the hopper might be driven by the game card? Or the blue pl10 connector it’s hard to tell! the white triac connctor is fully populated so must be doing another job! thanks Ronnie

Never had anything to do with one with a hopper on it (bit modern for me lol) but i would think it is still related to the battery damage. Which port on the mpu does the hopper plug into, maybe have a look at the tracks to that socket and see where they go in relation to the damaged area. Jim

Thanks for this jimxxx, that makes sense, and maybe confirms a switch matrix issue in that the hopper is getting switched on. Or could it be the hopper driver board, it looks to be over engineered to me. Thanks Ronnie

After typing the above i did a quick search and found this on github/mame, seems to point in that direction although F knows what it means apart from it appears to be hopper related.

As a complete guess (but logical) and i may be completely wrong but heres my two peneth worth. Since you have mentioned that about the hopper is the alarm maybe Unexpected Pay Out.🤔

Might be a smoking gun? As machine boots up and just before the error comes up I can hear the hopper motor pulse for just a second and that triggers the error message, I see a hopper driver board under the mpu if I unplug the hopper I get error 4.0 hopper jam the error with it plugged in id 4.0 unexpected PO thanks Ronnie

So IC22 pin 3 is pulse pin 6 is high pin 8 is low and pin 11 is pulse checked IC33 pins 16 and 13 are floating, only other pin pulsing is pin 2, the rest are either high or low Thanks Ronnie

Thanks bob will double check those pins but everything else was pulsing other than 4 5 and 6

You should see pulsing outputs on pins 7-15. The ones we're interested in go to IC22 so make sure the outputs on 3,6,8 and 11 are good. Depending on what switches are operated you should then see good outputs on IC33 & 34. These two are in the firing line for the battery vapours and can do funny things. I think I've mentioned this already.

I’m on holiday at the moment, so not with a machine.. BUT hopefully this helps. with the route plug in place, it’s either top two left side, or top left, and bottom left. 90% sure it’s the former, you can link these without a plug if you wish, but a plug would be cleaner unless you have some link tabs there

Just got round to checking IC23, not sure what I should be seeing? The enables 4 and 5 are low 6 is hi, inputs and outputs are all pulsing? Thanks Ronnie

Power, Power, Power. We have all done it and will no doubt continue to do so, start off and get side tracked, cant see the the wood for the trees scenario. Well done Bob, another interesting read. Didnt realise Caroline was still going, just had a look on their home page and the solar power meter for the Orford Transmitter made me chuckle.