Even though we might be able to get this power supply working, it’s disappointing to see how far out of range it is. We would recommend lowering the +5 VDC line down to about 5.1 and the +12 VDC line down to 11.5. If you cannot get the power supply in this range then you might need to contact Happ about getting a new one. As for the positive/negative readings, it could be that you have your black and red leads mixed up either during your test (the black should be on the ground) or hooked up to your multimeter wrong. I wouldn’t worry too much about it, just see if you can get the voltages around where we recommend.

We have also featured your question on episode 23 of our Q&A podcast. Please listen to it for more of our thoughts on your question. Thank you for your question and good luck with your repair.

Trevor

You asked us if this is a power issue and it sure sounds like one. We recommend checking your 5 VDC and 12 VDC on your power supply to make sure that both are giving you the correct voltages. You can also try checking the power at the board on the JAMMA harness to see if you’re getting the same 5 VDC and 12 VDC there. Keep in mind that it’s better to be a little high on these voltages than low so make your adjustments accordingly. If you continue to have problems after you have adjusted the power supply then it might be time to look at your board for problems.

We have also featured your question on episode 11 of our Q&A podcast. Please listen to it for more of our thoughts on your question. Thank you for your question and good luck with your repair.

We are curious as to what arcade game this is going into. Some of the newer style games use 24 VDC but typically have the 12 VDC and 5 VDC included as well. While we have never seen an arcade game that just uses 24 VDC, it is very possible that you have one in your possession. We recommend locating the pinouts for this game to see if they show the 24 VDC line and where it goes on the harness.

It is also possible that someone installed the wrong power supply in your game. Should you need a new power supply, we recommend a standard switching power supply from therealbobroberts.net. These are very similar to the one we use in our Checking And Replacing A Power Supply post. If you buy one and follow the instructions there you should be fine.

We have also featured your question on episode 11 of our Q&A podcast. Please listen to it for more of our thoughts on your question. Thank you for your question and keep us updated on your progress.

Any help on this would be great, thanks!

my question is, how do i wire up this power supply since there are no 12v or 5v??

thanks guys.