Model 3 wiring

[erzane]

Hello there,

Maybe it's a better place to post this :

I wonder why a few NAC do have four connectors wired instead of three on the PSU.
On these pics, the 12 posi fourth connector is wired with several yellow wires (maybe some are +5v since they are yellow). What's their purpose ? There are some JVS NH connectors hooked to this extra harness. Maybe these are for Sega Model 3 ?
If yes, which harness should I use to run a model 3 ?

 

[Tibal]

Model 3 boards also need 3.3v (on a 24pin JST NH connector)
Maybe it is for Model 2 boards? They need 10pin JSTs for DC input.
Here you have the pinout for Model 2 and 3 boards : https://www.arcade-projects.com/threads/sega-model-2-and-model-3-filter-board-pinouts.1121/

 

[erzane]

Useful, thanks !
Yes, Model 3.
Can you tell me which wires should I add to the 12 posi conn there ?

 

[Tibal]

Here is the pinout (on the label):
https://wiki.arcadeotaku.com/w/File:Sega_400-5198-01Y_pinout.jpg
There is no 3.3v, so no Model 3

 

[erzane]

Thanks ! Correct as you say. So, refering to your pinout and the model 2 shemas - these wires ends with : 1 x JST 10NH (containing 5 x GND + 5 x 5V) and 1 x 2 posi AMPUP blue (containing 1 x 5V + 1 x 12V).

But on my pic, it seems that these wires ends with two different JST NH conns (and a 2 posi AMP UP blue as well).

So, no way to play a VF3 on any NAC ? Maybe VF3 / Model 3 was developped for Blast or Astro2 ?

Btw, I also found some pinouts on the label of my PSU (400-5198-01X), which are the same regarding CN3.