Cabinet Q&A • NAC counter issue

[ArcadeOtaku]

What is ''1N4001'' ?
It's a diode.

So, the counter will work without any GND?
Correct. However, if your counter has a light in it, then it will need an additional ground wire.

Also, by this way, how to make the counter activated when pushing on the service switch?
The counter is driven by the game board. Normally service credits don't add to the counter, because they're not 'real' credits. If you want to change this behaviour, you need to swap the wiring from the coin mech switch to the service button.I see. Thanks!

Source: https://forum.arcadeotaku.com/viewtopic ... 08#p564008