Game is set for 230VAC
Game was working fine.
Game now blows circuit breaker when switched on, not when plugged into the outlet.
Varistor or Filter is not shorted otherwise there would be a problem when the machine was plugged in with power switch off.
Power Switch could be shorted. I would examine and check the switch to make sure it isn't causing a short.
Measuring the resistance between the black and white wires going to 1 and 7 you see a short.
3 and 9 are supposed to be connected for 230VAC operation.
Measuring without the 3 to 9 connection opens the primary circuit, so with the machine UN-plugged, the 3 to 9 connection OPEN and power switch ON, measure the resistance of the black and white wires 1-7. If you see a short now, the power switch is the problem.
A short would be 0 ohms.
If your primary winding setup for 230VAC is shorted, transformer repair is possible, however the cost of repair most likely exceeds the transformer replacement cost. The solution is to find a used or new transformer.
I hope it is the power switch. The transformer is one of the most reliable components in the machine.