CPS 2 Graphics Issues when using a new power supply

[Big_P Big_p]

Hi Guys a quick question, I changed out a PSU today in my CPS 2 Multi Cabinet. This cab was initially going to be the home for a CPS 1 multi from aliexpress I had picked up as a result of it not working. Someone left it with me for repair but never picked it up. Because of this I had built the cab with bits and pieces I had laying around. Once I picked up the Darksoft CPS 2 multi and loved it, I have being upgrading to more reliable parts.
Today I changed out the power supply. I attempted changing it from a Cheap 10A Chinese PSU that looks to contain crappy parts and have a few... lets just say "safety issues, to a Mean Well RT-65A which I also had lying around and I typically find better built. In the process I added a voltmeter to the cab measuring voltage at the PSU. I put the Mean Well in and adjusted the voltage at the JAMMA edge to 5v (which showed on my new voltmeter as 5.08v at the power supply.
When I powered up the cab I got flickering graphics, after playing around a bit not finding the solution, I switched back to the old power supply, which powered up without graphics flickering. The old power supply I reinstalled is showing 5.21v at the supply and 5.12v at the JAMMA edge. I am just wondering if this is an issue with the Mean Well being only rated at 6A in which case I will get the bigger one (RT-125???). I have a coin mech, CGA to VGA converter and marquee and coin door lights, also running off the power supply, but it never seems to draw anywhere near 6A. I also though that it could be that I didn't adjust the voltage up quite high enough on the new supply. I never checked the old power supply before I pulled it out because I had checked it prior to putting it in a while ago, but it must have settled a bit higher. My final though was that it could be a dodgy Mean Well, maybe cooked caps. Any thoughts as I feel like I really should get the current PSU changed out, but not sure if I should give up on the RT-65a or keep digging.

 

[brad808]

To be honest measuring at the PSU itself is all but useless. Especially since you say that you are running multiple loads off it with variable current draws.

 

[Big_P Big_p]

Yeah, I have a voltmeter reading the JAMMA edge on my harness, and even thats not perfect. It's also hard to almost impossible to see when you are playing around with the PSU. The idea was to tap the PSU voltage adjustment pot and put a dial in next to the new voltmeter. If you knew the JAMMA edge voltage the PSU reading should be enough to adjust it from the back before going back to check it at the JAMMA edge.

 

[Big_P Big_p]

Even without the pot installed voltage adjustment was much easier with it, but you are correct in that I wouldn't work off that alone.

 

[Big_P Big_p]

I think I have worked this issue out. It looks like the amp draw is really close to the PSU max. While it's no where close to 6A on the 5v, I didn't realise that the 12v was only 2A, for some reason I thought it was 3A. Combined everything running in zthe cab would be close (just under 1A on the 5v and 1.7A on the 12v. It looks like most games run with the RT-65a however graphically heavy games like sfa3 which is what I was running during my test have graphics flickering. I just ordered a few RT-125a so I'll install one of these when they turn up.