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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!

Hi and welcome.. You say you have changed the battery but what state was the old battery in, was there evidence of leakage around it, can you post a picture of the circuit board around the battery area front and back. 9 times out of 10 problems arise from battery leakage over a period of time, the new battery should idealy be fitted away from the board on fly wires.

Hi, I have a Barcrest King of Roulette (MPU4) that sat unused for about 13 years. It first showed a battery error, so I replaced the battery. Now it boots, but when I insert coins (or even add credit with the key) after 2–3 seconds it shows “BLACK BOX”. What usually causes this on MPU4 and what should I check first to fix it? Thanks!

Hi, I have a Barcrest King of Roulette (MPU4) that sat unused for about 13 years. It first showed a battery error, so I replaced the battery. Now it boots, but when I insert coins (or even add credit with the key) after 2–3 seconds it shows “BLACK BOX”. What usually causes this on MPU4 and what should I check first to fix it? Thanks!

Hi, I have a Barcrest King of Roulette (MPU4) that sat unused for about 13 years. It first showed a battery error, so I replaced the battery. Now it boots, but when I insert coins (or even add credit with the key) after 2–3 seconds it shows “BLACK BOX”. What usually causes this on MPU4 and what should I check first to fix it? Thanks!

Hi, I have a Barcrest King of Roulette (MPU4) that sat unused for about 13 years. It first showed a battery error, so I replaced the battery. Now it boots, but when I insert coins (or even add credit with the key) after 2–3 seconds it shows “BLACK BOX”. What usually causes this on MPU4 and what should I check first to fix it? Thanks!

Hi everyone,I’m hoping for some advice with my Barcrest King of Roulette (MPU4). The machine has been in storage for about 13 years. When I powered it up it originally showed a battery error, so I replaced the battery. After that the machine boots and plays the intro/attract, but when I insert coins it will accept them briefly and then after about 2–3 seconds it shows “BLACK BOX” on the display. It also happens if I add credit using the key/service method (so not only with coin insertion) — after a couple seconds it still ends up with BLACK BOX. Does this point to a coin mech/validator issue, an I/O fault, or possibly RAM/NVRAM corruption from sitting for so long? What are the best first checks to diagnose this (connectors, DIP settings, clear/ram reset procedure, etc.)? How can I fix it and get the machine working again (even in free play just for testing)? Thanks in advance for any help!

Hi everyone,I’m hoping for some advice with my Barcrest King of Roulette (MPU4). The machine has been in storage for about 13 years. When I powered it up it originally showed a battery error, so I replaced the battery. After that the machine boots and plays the intro/attract, but when I insert coins it will accept them briefly and then after about 2–3 seconds it shows “BLACK BOX” on the display. It also happens if I add credit using the key/service method (so not only with coin insertion) — after a couple seconds it still ends up with BLACK BOX. Does this point to a coin mech/validator issue, an I/O fault, or possibly RAM/NVRAM corruption from sitting for so long? What are the best first checks to diagnose this (connectors, DIP settings, clear/ram reset procedure, etc.)? How can I fix it and get the machine working again (even in free play just for testing)? Thanks in advance for any help!

Hi everyone, I’m hoping for some advice with my Barcrest King of Roulette (MPU4). The machine has been in storage for about 13 years. When I powered it up it originally showed a battery error, so I replaced the battery. After that the machine boots and plays the intro/attract, but when I insert coins it will accept them briefly and then after about 2–3 seconds it shows “BLACK BOX” on the display. It also happens if I add credit using the key/service method (so not only with coin insertion) — after a couple seconds it still ends up with BLACK BOX. Does this point to a coin mech/validator issue, an I/O fault, or possibly RAM/NVRAM corruption from sitting for so long? What are the best first checks to diagnose this (connectors, DIP settings, clear/ram reset procedure, etc.)? How can I fix it and get the machine working again (even in free play just for testing)? Thanks in advance for any help!

Hi everyone, I’m hoping for some advice with my Barcrest King of Roulette (MPU4). The machine has been in storage for about 13 years. When I powered it up it originally showed a battery error, so I replaced the battery. After that the machine boots and plays the intro/attract, but when I insert coins it will accept them briefly and then after about 2–3 seconds it shows “BLACK BOX” on the display. It also happens if I add credit using the key/service method (so not only with coin insertion) — after a couple seconds it still ends up with BLACK BOX. Does this point to a coin mech/validator issue, an I/O fault, or possibly RAM/NVRAM corruption from sitting for so long? What are the best first checks to diagnose this (connectors, DIP settings, clear/ram reset procedure, etc.)? How can I fix it and get the machine working again (even in free play just for testing)? Thanks in advance for any help!

Good evening, everyone. Thank you for taking an interest in my problem. So, T56 = BC172 (new) As are T57, T58, T59, and T60 (BC172) (new) T61 = ZTX510 (new) I'm going to do some checks, track checks and others. Thanks; have a good evening.

That's wrong, it should go high after about 1 second. This means there's something wrong in the RESET circuit. What did you replace as T56?