Quoted from Otaku:Anyways, the coin lockout relay is ON when the machine is ON, and obviously vice-versa, they are both off at the same time. So when the machine is off, the door automatically rejects ALL quarters - and when it is on with a properly functioning coin lockout relay, it will accept them.
Not sure this is totally correct. The coin lockout will be in operation while the machine is resetting. But will accept coins once the machine has finished the reset process. Depending on the machine, as a rule it will return any coin that is added while the score motor is mid cycle but accept coins when at zero position . And yes it also returns coins if the machine is off.
