Sega model 3 power supply issues

[Skratcher]

I recently picked up a Harley LA riders cab, it has a 600w ATX power supply, it wasn't working at first(stuck on daughter board detected text) after messing with the wiring I got it to boot up and looks okay but the 5v is reading 4.8
I decided to try another ATX power supply I had laying around and it's reading about the same on the 5v line… weird

Is there no way to adjust the voltage on these ATX power supplies?
I have an orignal model 3 JQA power supply but I would need the harness connectors to re wire it, anyone know where to get those?

 

[Mrhide]

I have an orignal model 3 JQA power supply but I would need the harness connectors to re wire it, anyone know where to get those?

you need
1
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176277-1/2328019
2
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176279-1/2328021
3
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176280-1/1153000
4
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176278-1/2328020

and the pins
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/175152-2/2328002

 

[Skratcher]

you need
1
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176277-1/2328019
2
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176279-1/2328021
3
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176280-1/1153000
4
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/176278-1/2328020

and the pins
https://www.digikey.ca/en/products/detail/te-connectivity-amp-connectors/175152-2/2328002

Thank you, It would’ve took me a long time to find all those, I owe you one.

 

[Skratcher]

Trying to wrap my head around how to re wire this mess back to the original connectors to fit the original power supply. Anyone have any suggestions on how to tackle this mind fuck? I’m not sure where to start re wiring this

 

[Mrhide]

oh boy.

hint: they are color coded.

Sega / Naomi / All Jap Machines.

Red = +12 Volts
Yellow = +5 Volts
Brown = +3.3 Volts
White and or Black = 0V or Gnd

 

[Skratcher]

Ive decided to go with a new power supply. This 300w PSU supplies the proper voltages
https://twistedquarter.com/index.php?main_page=product_info&cPath=521_527&products_id=3785
The one thing I don’t understand is the “5v output” wires from the filter board.
Where do those lines go to the Power supply? Is there a specific spot they go into the PSU or do they just tie into the +5v line

 

[nem]

The one thing I don’t understand is the “5v output” wires from the filter board.

They're not supposed to be connected to the PSU. You can connect them, but that's not the idea.