fmetz374
Member
I've been searching through the forums for an answer to getting a switching power supply to work in a 2-board Donkey Kong but it appears most posts are quite old going back to 2010/2011. I apologize in advance if I am asking a duplicate question that has already been answered.
I purchased a switching power supply conversion kit from Arcade Shop found here:
http://www.arcadeshop.com/i/545/nintendo-power-supply-conversion-kit.htm
After installing, I am now getting vertical graphics corruption that I've seen other people with this issue refer to as "sprites". In any case it appears this is due to the -5V power rail not delivering either the correct voltage or amperage to the DK 2-board set, thus causing graphics corruption.
I can switch back to the 37 year old Nintendo power supply and the game goes back to working flawlessly. For those that are asking why I'm attempting to swap out a working power supply, my reason is that after 37 years it is likely time to replace or it soon will be time to replace.
The power supply that came with the kit was a Suzo Happ Power Pro. I did a meter reading on the power supply with no load and only AC connected to it. While the +5V terminal reads +5V, the -5V terminal only reads -4.2V. I suspect this is why I am getting the graphics corruption on my board. I can adjust the 5V potentiometer on the power supply to get the -5V terminal to read -5V, but then the +5V terminal reads 6V's which is much too high for the DK PCB.
Just curious if there is a different power supply I can use? I've attempted to go as high as 5.2V on the PCB and this reduces the graphics corruption but does not eliminate it.
I purchased a switching power supply conversion kit from Arcade Shop found here:
http://www.arcadeshop.com/i/545/nintendo-power-supply-conversion-kit.htm
After installing, I am now getting vertical graphics corruption that I've seen other people with this issue refer to as "sprites". In any case it appears this is due to the -5V power rail not delivering either the correct voltage or amperage to the DK 2-board set, thus causing graphics corruption.
I can switch back to the 37 year old Nintendo power supply and the game goes back to working flawlessly. For those that are asking why I'm attempting to swap out a working power supply, my reason is that after 37 years it is likely time to replace or it soon will be time to replace.
The power supply that came with the kit was a Suzo Happ Power Pro. I did a meter reading on the power supply with no load and only AC connected to it. While the +5V terminal reads +5V, the -5V terminal only reads -4.2V. I suspect this is why I am getting the graphics corruption on my board. I can adjust the 5V potentiometer on the power supply to get the -5V terminal to read -5V, but then the +5V terminal reads 6V's which is much too high for the DK PCB.
Just curious if there is a different power supply I can use? I've attempted to go as high as 5.2V on the PCB and this reduces the graphics corruption but does not eliminate it.



