I had a sticky beak at Adam's machine today and I am very disappointed to say the machine beat me. In fact, I'm pretty P'd off.
Anyway.......
We found a dead transistor on the lamp driver board associated with the pop bumper globe in question -Q39. I would have quite happily put $100 on it that this was the issue and started spruiking that Adam was going to owe me big time etc etc. I replaced it and bugger me, the lamp was still dead. lesson 1 - keep my fat mouth shut until it is fixed next time.
There is continuity between the lamp socket lug and the corresponding pin on the connector. There is continuity between the common power wire to this lamp socket and the other 2 pop bumper lamp sockets. The wire is the correct wire going to the correct pin position on the J3 connector on the lamp driver board. I am pretty confident that the wiring isn't the issue.
We tried another lamp driver board - it made no difference.
We even tried another solenoid driver board - it made no difference.
One thing I did notice though was that when the roll over switch for the corresponding lane (lane A) that should light the pop bumper was activated, it in turn activated the right hand pop bumper (as if a ball had activated the pop bumper) which should be totally unrelated and as far as I am aware should not have been activating. This may be related to some sort of switch matrix issue??????
This is where we stopped as Adam had to go back to work. So as far as I can tell, the only thing we haven't tried swapping with another board is the MPU and everything else seems to test OK.
Anyone have any thoughts.....please?
Just to clarify... only the bulb should light up but the adjacent bumper also fires?.. Remember that a switch only runs the circuit to ground, so if what I read is the case then there is a common ground for the coil on RHS bumper and the lamp on the bumper in question.. is there a common driver IC or 7XXX buffer that is common to both?
