I have a Gottlieb Mustang that has just developed a ball count issue.Was working fine now the ball count will only advance intermediately. She works...She does work . I have check both the ball return switches, they are operating o.k. The player unit looks ok. It advances when pulsed. I suspect it is not getting told to advance every now and again? I also had a look at the "P" add a player unit it also looks fine to me.
When the error occurs , If i activate the second switch , (the one the ball rolls over when kicked out), a number of times the count advances.
what am I missing , ( besides a Mustang Schematic ) . I could be wrong but I feel it is a contact somewhere not doing its thing.
Any help would be greatly appreciated.