Is there any way to adjust +5V on a Punch-Out power supply (PP-1000A)?

MaximRecoil

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Is there any way to adjust +5V on a Punch-Out power supply (PP-1000A)?

I've been having graphic problems with both my PO and SPO boardsets in my SPO machine, and usually doing things like cleaning the card edge and connector, and reseating the socketed chips fixes the problem temporarily. I suspected the power supply wasn't putting out sufficient +5 voltage. I just measured it at the card edge pins on the board and it is 4.89V, so I think that is the problem.

There's no obvious way to adjust +5V on this power supply, but maybe there is an internal way? If not, is there something internally that can be replaced to fix the problem? The simplest thing to do would be to use an ordinary JAMMA type switcher, but I don't want to hack the wiring harness.
 
VR2 inside the power supply is the 5v adjust. If it fixes your issues I'd think about recapping it as well. Use some nice low ESR caps to replace the 3300 uF caps.
 
VR2 inside the power supply is the 5v adjust. If it fixes your issues I'd think about recapping it as well. Use some nice low ESR caps to replace the 3300 uF caps.

Excellent, thanks.

Do you have a suggestion for voltage? Should I try to get it at exactly +5V or should I go a little over, like 5.10V?

If it is not too much trouble, do you have a link for the low ESR capacitors?
 
Personally, I've never had many problems with Nintendo boards and voltages. Try to get it some where between 5 and 5.1 and leave it there. I wouldn't mess with it for too long trying to get some magical value.

Here are some links to some capacitors. I prefer Panasonic or Nichicon caps and use Low ESR caps on the outputs of any switching regulator. Do a check on spacing and height before ordering any of these as I haven't checked. Also, you may need to check the voltage again afterwards.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P10260-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P10261-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12373-ND
 
Personally, I've never had many problems with Nintendo boards and voltages. Try to get it some where between 5 and 5.1 and leave it there. I wouldn't mess with it for too long trying to get some magical value.

Here are some links to some capacitors. I prefer Panasonic or Nichicon caps and use Low ESR caps on the outputs of any switching regulator. Do a check on spacing and height before ordering any of these as I haven't checked. Also, you may need to check the voltage again afterwards.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P10260-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P10261-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12373-ND

Thanks. I adjusted it to 5.02V and that fixed the minor glitches for the PO boardset, and it is working perfectly.

The SPO boardset seems to have something more serious going on with it however. Most of the graphics are corrupted (well beyond a few glitches). The audio seems to be working fine. I last had it on maybe a week ago and it was working fine. I went to turn it on last night and it was in the state it's in now. I swapped the PO boardset into it and it was mostly working, with those few glitches here and there. That's when I checked the +5V. Well like I said, adjusting it to 5.02V solved the PO issues, but did nothing for the SPO issues. I just did the reseating socketed chips and cleaning the card edge routine, but no change.

Would you care to fix it for me? I don't have the equipment or knowledge to diagnose stuff like this.

I wish the SPO-specific chips were limited to one board; then I could just swap boards around with the PO to at least narrow it down to which board is having problems.
 
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