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Tekken 3 only 5v question

pierpa86

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Joined
May 5, 2022
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Hello guys,
Im trying to consoling my Tekken 3, as always i will use only 5v power since 12v is needed for sound AMP.
But on Namco System 12 its will stuck on JVS screen test, loop test.
Checking JVS power connector on board we have only this pins:

1 - 2 - 3
4 - 5 - 6

NC - NC - 5V
GND - GND - GND

So its can be powered with only 5v but need USB JVS connected ?

Bonus question :-)
I got this power supply with 12v and 5v on two separated channel:
So its have 1GND for 12v and 1GND for 5v.
Since on jamma we have only 1 channel so 1GND in common for both 12v and 5v if i use it will short the two power supply channel and it pop ? ?(

1754162635420.png
 
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