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@MattyL that's not what he asked 😆

The PSU sounds like an ultra sonic cleaner! The fans seem to fail. My take is its just general case air movement... its not like a proper heat sync or critical exhaust fan but is beneficial obviously. Both power supply types can be used. You just have to unlatch the end red wire crimp and move to a spare 12v. I still think you might have another problem. I'd at least expect it to start booting. If you can use a multimeter you can measure the 5v while connected to the machine. If it dips bellow a threshold voltage I forget what so im going to guess at 4.8v-5.2v (Sega) the Scorp4 will keep reseting. Needs to be connected to the load (machine).

all i can say then is google is your friend, find the pinouts, check they are the same, if not modify the wiring and there you go, good luck in your quest

No I didn't. I asked about 2 specific PSU's, gave their model numbers and asked if they were Interchangeable. Thanks all the same.

no idea!, you didn't post a pinout of the sps077w. you asked if all scorp4 power supplies were basically the same, i said they are not and gave you the reason why they are not the same

It's hard to pick up on the video but I tried. Also I just noticed there is a fan in the unit that doesn't spin. Should it spin as soon as it's powered on? YouCut_20260410_092220064.mp4

Yes mate I've separated it from the machine and it's humming like high pitched. The battery was done a few years ago and is now wired separately from the board to protect agaist future leaks. So from your comments, a working sps077w should just plug and play?

I think you have another problem because of the noise. Can you confirm its defo coming from the supply and not the speaker? Unserviced Scorp 4 machines in 2026 will probably have a leaking battery on the main board which most people diagnose as a power fault, so take a look at that. Film the noise if you can, I've never know a scorp 4 supply to be humming personally- x2 seems very strange/interesting. Looking at your loom, if there is a power supply mismatch- its not the destructive way around. Ive seen machines with the wiring the same as yours and with the later supply it usually manifests as something like no power to the reels... Defo shouldn't be humming.

Thanks so much, this is the plug from my machine which appears to utilise the end pins like in your picture, is that what you mean? Should I look for a psu that has a similar pin label to that ?

this is what i mean, some have nothing on the end pins, some have 12v

there are differences between supplies, its usually the end pin, some have 12v on them, some have something else, so the trick is to make sure your machine doesn't use the very end pin then they work, as for the models that this happens with i cant remember now

Hi, I have a Scorpion 4 machine with a failed PSU (makes a really loud humming noise and does'nt power the machine correctly). The PSU is the Sanken GSK017HA 44v. About a year ago I took a gamble and bought a 44v Sanken SPS077W hoping it would work as the connections are identical. However, it didn't light up the machine. It just made a loud whining noise, I assumed that this PSU isn't compatible and left it hoping to come across a 2nd hand GSK. I've come back to it this week, and discovered the the replacement I bought makes this noise even when its not plugged into the the machine. So my question is: Did i buy a faulty PSU and just assumed its not compatible, and are these 2 PSU's actually inter-changeable? Thanks,

Welcome, we’ve had loads of people called Gary join today 😅 when you inevitably try and comment, but unable to reply, pls change theme of page by scrolling to bottom. This is a common issue for years now

Hello and welcome to the forum. There's many good people on here.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Thanks for the pictures, will be great for emulation purposes. I can dump the ROMs for you if needs be.

Well, one of the functions that IC24 does is to monitor the lamps for short circuit bulbs and turn off that bulb as a precaution. It does this by monitoring the voltage dropped across the mux voltage feed resistors. This is fed into a little two transistor sensor circuit which then puts a signal on pin 10 of IC24. In this case both the transistors were iffy and the signal on pin 10 was constantly low. This is then fed back to the CPU which told IC12 to send permanent wait states up the CPU's own backside! Both transistors (T68, T69) had black legs and the BC337 (T69) tested leaky. Once swapped out along with the 5.1v zener as a precaution IC12 didn't send any more pulses on pin 7 and you could see the lamps at full brightness along with all the switches now working. To say I was relieved was an understatement.

Come on Bob, put me out of my misery 🤣