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I’ve have had another good root in another location and found these. Again untested but I know people on here have the ability to repair. 3 x system one PSU 1 x impact PSU 2 x barcrest comm's pcb 1 x impact game card 1 x unknown PSU (please let me know what it is) 3 x barcrest top box with MUX pcb 2 x barcrest top box with MUX pcb

Oh my god, I have just had the little grey cells motivated at the mention of "a couple of blackjack or poker type video machines" I remember driving around France changing memory cards on Video Roulette machines. That will be in a future post which will now be a little bigger ....

Set on 10p with the jackpot at £4 thanks to the rom and image provider and the late great genius wizard (r.i.p) NUDGE BONANZA.zip

Set on 10p play/£2 jackpot thanks to the rom provider, and to the late great genius of a man wizard NCU.zip

Reading the description, One has part missing and second is just an empty cabinet. https://www.ebay.co.uk/itm/255180100638?hash=item3b69eb541e:g:PbAAAOSw4rZhaW0t

righto after many years ive finally stuck all the flyers i have left in manufacturer order i am sure there are some that are not scanned for whatever reason so please if there are any gaps or anything wanted please list game name and manufacturer and i will have a quick look , cant promise anything . stay safe you lot rich

Fired up first time and ran without a hitch. Don't you just love it when that happens.

Some more boards giving me the run around or beyond economic repair. First one was a real pain, it wouldn't initialise and for the life of me I couldn't see why? Someone had been here before which is always a worry but they work seemed of a good standard. So the nitty gritty....on switch on there was just a short pulse to the RAM and then a few address lines died and it just sat there. IC9 (74LS138) and IC24 (74LS12) had been changed so I knew all was good in that dept and all the other usual stuff had been done. The first suspect was the CPU which was swapped but no difference. Next one was the 6840 as I've seen this stop boards booting before, but again nope! Not wanting to continue the wild goose chase I thought I'd try and think this one out. Next step was to tap out all the data and address lines to make sure there were no shorts or open circuits, which there weren't. Then it was the turn of all the other functions eg E, NMI, VMA etc. When I got to the R/W I found there was no connection from the RAM (pin 10) to the R/W line feeding the rest of the board? What a relief I'd actually found something. On the previous repair the two RAM sockets had been changed but because they were using the RAM daughterboard they had to be the stamped pin type as you can see in the pic. On removal of the socket in IC8 I found this... The via at pin 10 of IC8 had been ripped apart and consequently lost connection. So a quick rivet insert, a tack wire and a bit of solder mask to finish off and she's as good new. When all put back together it booted and ran fine. ....and the next one. This had already been deemed beyond economic repair as you will see from the pic.... The board was toasted right through just above the power diodes and various components further up the board varied in incinerated, well done to medium rare depending whether they caught the flame or not. As I was head scratching yet another board I thought, why not, and stuck it on the bench. First thing is to give it a clean and try and remove as much carbon as possible. Once done this left a sizeable hole in the board. This has to be done though as any carbon left will just track and start the whole process over again. I must admit it does look scarey but I've done this quite a few times now so it's pretty much business as usual. The next step is to make up some resin, seal the bottom with cellotape and then fill the hole. Once this has set the track needs to be re-made, holes drilled, rivets fitted and solder mask applied. New track cut and fitted and riveted. They do look close together but it's a trick of the light! I still need to drill and fit another rivet for the white power lead but that's tomorrows job. Then a bit of solder mask to finish off. All that's left is to swap out all the burnt components and the usual bits and pieces. I just hope after all this it doesn't have any obscure faults!!

Great read and another interesting chapter .like Alan (roadrunner) says this for me is the most interesting era of jpm for me as well .if i can ask a couple of questions which ive often wondered about. Was the development of club machines since electro development kept separate to the awp side ?obviously they were designed for a different market and had higher jackpots and played quite differently to awp .also why did jpm choose not to include a nudge feature on any of its mpu based club machines during the late 70s and throughout the 80s ?was it perhaps to avoid paying carfield fees ?

Well well well ive managed something and it works lol I decided against removing what looked to be a riveted coil etc. And just decided to move everything from the old bases and piggyback the new relay on top lol Thanks everyone Happy days

you need to know if this machine has a valid time limited dongle 9C is typical of a non comms error with the dongle,,,,,,,,,,, most likely something he has done to disturb the TLD setting or its gone out of time itself or with the machine time date setting ( battery short ?) ADVICE turn off the machine unplug the dongle and unplug the note accepter (if fitted) reboot the machine and let it fully reset???? turn off again and just replug in the dongle leaving the noteacc unplugged and boot it again if it fails check the mpu plug at plug N and that wire loom to the TLD then plug the note accepter back in and boot again the battery may have been corrupted or low/high if the error changes to 9d or 99 the TLD has maybe expired or is set incorrectly this can be checked in test mode extended test checking test 9.2 clock set to see if the current date and time are ok.. extend test to 10C which allows the dongle time left check and set it up with correct date etc, if required .. if its expired it needs replacing as thats why they are time limited-good luck info. if it is dongle .. if its pre dongle its likely the battery (it may be cured already by now? ) TLD for some older machines can now be 'lifetime' approx 15-20 years and will show expires 2038 or similar others only live for 6, 12, 24, months or similar if the machine is data encrypted 'DES' then the note accepter could have 'unpaired' and alarm NOTE RC A2 NP may show on the display so will perhaps also need matching to the machine the op should know how this is done if he has swapped any............ if its all ok with the doors open at this point close the top door first and the lower door last while the power is 'on' and see if it reboots without error?? its a tricky one as i am not in front of the machine. perhaps this may help? sorry late aid Ronnie only just seen the HELP request .

Yet another board from hell arrived on the workbench! From initial looks anyone would think it's not too bad, just the usual stuff to swap out and off we go. How wrong was I! The list of faults won't be in chronological order as there were so many I've lost track. I think it originally was stuck in reset but as all the transistors and other components were going to be swapped out in the reset circuit no in depth testing was done. There were loads of crumbly solder joints and getting some of the old bits out was a challenge but no pads lifted in the process which was good. So with all new bits in and looking shiny underneath it was time for a power up.....and....nothing! Not surprising really but things went downhill from here onwards, especially my sanity! On switch on you can get a rough idea if it's going to boot or even initialise by the click it makes and the reels judder. In this case there was nothing and the first step is always to check the RAM, of course it was knackered. In with my test RAM daughterboard and ..... nothing! Next one I always go for is the 555 ocillator as if this is out of limits then it won't run. Having said that with the diags it should show a triac output whether the osc is running high/low or not at all but in this case there was nothing. With the scope it measure around 450Hz which is far too low. All the associated components were swapped to no avail so a new 555 was put in and we had a good 500Hz. Still no boot though. So we now move on to the support chips and see which one is stopping it from booting. I won't bore you with the details here but once the 6840 (IC2) the three 6821's (IC 3,4&5) were swapped it sprang into life. However things weren't right and the reels were intermittent as were the lamps (there were more problems here) and the triacs. What was happening was the connectors were covered with that brown corroded (patina) and weren't making good, if any, contact. No amount of switch cleaner made them any better so the best course of action was to get them all swapped out. Luckily I had a donor board to hand and this is the only way to get these sockets now especially with the right colours. So with 'new' clean sockets things were better but still not right. Moving the ROM cart caused it to freeze and despite cleaning just tapping the cart caused it to freeze. On of the connectors was also broken which you might be able to see but I don't think that was an issue. Anyway back to the donor board and exchange the cart socket. Now flexing the cart it was solid but a tap and it would freeze!! Hmm thinks, I'll come back to that one. Attention was now turned to the lamps. The new socket had brought a few more lamps into play but there still a couple of lines playing up and 2 BDX34's were found to be duff. There were also switch issues which were caused by IC22 (CD4049). OK, so it all appears to be running and testing fine, except for one thing, after about 10 mins on the test rig it freezes. Tapping around the cart and CPU also causes it to freeze? Hmm not removed the CPU yet so out it comes and back in with a socket and.... still the same. By this time I'm thinking of jumping in the Thames again! New day, new ideas. As the CPU is now in a socket it's easy to put a new one in. Well, what do you know solid as a rock. Back in with the old one and either leave it for about 10 mins or lightly tap it and it freezes. The pins are all clean so it must be intermittent inside. You couldn't make it up. So almost time to wrap up until I checked out the AUX port PIO. I always run software with an alpha as if that runs OK then the chip is usually good. Well guess what the alpha just came up with a load of rubbish! In with yet another 6821 and thats all my spares gone. It all looks like it's working so now it's off to the Cabaret machine for a soak test. Half the 7 segs aren't working!! The diags don't check these which is a pain. This was due to IC16 (ULN2803). At last it's a goer and passed the soak test with flying colours.

The nightmares continue... Just finished a board that after the usual corroded components had been swapped out showed up a lamp fault with some lines not working. From cold though they were all working, I also noted that once the lamps stopped so did half a bank of switches. No amount of freezer anywhere or preheating the board made any difference to the time the fault took to show? With the switch test running on the diags the bad bank would work until a couple of minutes when if a switch was operated the board would continually bleep as if the switch was being operated on and off. Shortly after it would just stop and the whole bank was then dead. The other bank worked just fine?? Eventually I noticed that IC4 (6821) was losing an o/p which feeds to IC11 (74LS138) which controls the mux pulses for the lamps and switches. From cold it was there but then it would go intermittent and then stop. No amount of freezer on IC4 made any difference, nor did heating it up before switch on. So, in with a replacement and bingo all switches remain operational. Ready to wrap up when I noticed there was still one line of lamps out. IC11 had a bad o/p. Once changed all was good. Phew!!

LOL, they're all out there waiting for us.

I've got 3 MPU3's in at present which at first inspection didn't look to bad. Two of them though have been absolute horrors. This one has taken the best part of two days to get going and has had me going quite a few times. The first thing was the power regulator had the wires removed which was odd so these were reconnected. All the usual corroded bits were swapped out so then it was on to testing. Power up and a nice 5v but no sign of it booting. After a couple of minutes the 5v has dropped to about 1.5V and the regulator is running hot!! Checked for shorts and there weren't any. Switch on again and a nice 5v but a few mins later and here we go again. After disconnecting a few bits to try an isolate it I just ended up with the regulator board??? With it switched on and delivering a good 5v as soon as I touched the back of regulator transistor it shorted itself out?? I've never come across anything like that before. Anyway after a replacement was put in the 5V remained stable. That would have probably been enough for most folks but I'd hardly scratched the surface.So it still doesn't boot and after flexing the chassis up and down a couple of times the was no 5V on the board again. This time the red wire had broken and no amount of stripping it back showed any clean copper, which is normally the case. Off with the regulator board again, fit a new loom and off we go again. On power up the first check is to see if the CPU is running, which it wasn't. In with a new one and now there was activity on the address and data lines, stil no boot though it did initialise. Normally if you see a second twitch of the reels the diagnostics will show you what the fault might be by operating one of the triacs. In this case all the triacs were operated!! At some stage I discovered that the RAM chips were bad as well so it was in with my test motherboard to eliminate that one. The next chip to check was the 6840 as it's only a 28 pin device. With the chip removed it booted so it was time to move on as to why all the triacs were firing. This turned out to be IC3 (6821). With all the new IC's fitted it would now run all the diags with sound but I noticed one set of lights wasn't working and this turned out to be a BDX33 gone bad. Now the next one also had the wires removed from the regulator transistor!! Once these were connected and powered I was greeted with a big puff of smoke! C4 (1uf/35v tant)on the regulator board had gone short circuit. Once changed the 5v was good and the CPU was active. No boot though.... That's all for now folks, tune in later in the week, if I can work in the freezing cold, to see if I can sort this one.🥶