Breakout AC questions

kralleman

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Hi!
I am troubleshooting a loud hum in my Breakout cocktail and I came across the following that I just don't understand. Maybe someone here can shed som light? Sorry if it's a noob question.

Looking at the schematics for the edge connector, pin 7/H (solder and parts sides of the pin are connected) is marked as 6.3 VAC. Following the cable it goes to the tab marked as 14 on the xformer. This is what is also illustrated in the schematics (see attached). Tab 14 on the xformer is not a ground tab and it shows continuity to tab 13. The cable from tab 13 goes to the start-button lights and the coin return lights. These lights work as expected.

Pin 7/H at the edge connector is connected directly to the ground plane of the PCB, so I don't quite understand what is going, wouldn't tab 14 of the xformer feed AC to the ground plane of the PCB? It feels wrong but I can't quite wrap my head around this.
 

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the first pic, 6.3VAC GND. in other words 0 volts. You have continuity between 13 and 14 on the transformer because its a low impedance winding. Its really one REALLY long piece of wire with each end connected to each terminal.
 
Ah that's right, it does actually say 6.3vac gnd in the first pic. I missed that, I just stared at the 6.3vac part of that and the text in the pic with the edge connector pinout.
 
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