stargate grounding question

jpk0652

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Basiclly I put a new switching power supply in a stargate. Now it wont credit up. Someone on here said the coin door wasnt grounded anymore because the original power supply had been disconnected. I have 2 questions. 1 cant I just run a wire from the ground to any where on the door? 2 and if I cant do it that way can I just splice into the ground of the harness? Thanks
 
Basiclly I put a new switching power supply in a stargate. Now it wont credit up. Someone on here said the coin door wasnt grounded anymore because the original power supply had been disconnected. I have 2 questions. 1 cant I just run a wire from the ground to any where on the door? 2 and if I cant do it that way can I just splice into the ground of the harness? Thanks

The coindoor metal frame should be connected to the mains earth (if you have fully original cab wiring, then that is the 1/4" wide flat braided wire that connected to the power supply ac line filter, transformer case and any pcb metal plates etc etc. if that is not connected you can get shocks off the coin door and other potential problems. ;^)

Pin 6 of the 6 pin connector of the williams analogue power supply provides the missing ground for the coin door coin switches. look at the stargate drawing set pages 10 and 11, 11 covers the coin switch grounding schematic, 10 shows the game pcb/wiring grounding point on the power supply pcb (4j3) for the coin door. the ground wire you are looking for is the Black/Orange wire from the molex 6 pin in line connector formt he power supply to the coin door. connect that to the DC ground on your switch mode PS by some means and you should be coining up.
 
As Andy said, it is not the coin door, but the switches on the coin door that are not grounded. The original power supply was the point of contact for the coin door ground, so you can either run a jumper to the coin door and attach to the ground to an appropriate place in the switches. Or a better idea wold be to splice a ground from the switcher to the wire connected to pin 6 of the original coin door power connector.

The real answer is to junk the switcher and rebuild or replace the original power supply board. There is a long series of threads about why switchers are bad in Williams games.

ken
 
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