My Flipper pool has started play up, l have the game set to add balls at '10 target balls', '12 target balls', '14 target balls' and '15 target balls', also to add a ball at 2000 points and 5000 points. What has started to happen is it wont add balls at 10 and 12 target balls. Inside the machine there is the add a ball stepper which l have checked and cleaned contacts but this has made no difference. l changed the the add a ball to 9 and 11 target balls via the little pin bank and the machine works correctly when setup like this. Any pointers to why 10 and 12 target balls are not adding balls?.
Thanks in advance.