Weird Jamma PSU tied to MVS

ilpappa

Newbie
Credits
2CR
Hi everyone,
I’m restoring my new cab and found out this very unusual PSU. Please note all works well.
NC is not connected
220v connected to wall plug (phase and neutral)
6 and 8v connected to coin lights
130v connected to monitor chassis
-5 12 and 5 connected to MVS board
G, N and D are all connected and jointed to logic ground.
Earth ground from wall plug is not used at all.

I’d like to make things a little bit more secure by connecting earth ground:
- do you know what G, N and D are supposed to be?
- where should I connect earth ground?

Many thanks for your help
 

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