I've just installed a real knocker into my Stern Spiderman and have strange behavior which I'm sure has a simple software solution somewhere. I've changed the settings on Q24 to knocker and turned the artificial knocker sound off on #55 to off.
Mechanically and electronically all seems to be fine, and when I run the specific knocker test in the diagnostic menu both the electronic knocker and the real knocker solenoid fire. So far so good!
Unfortunately in the game nothing sounds or fires on a replay. Not expecting a sound from game, but was expecting the physical knocker to fire. Also when I do a coil test and test the spare coil on 24 nothing happens. ??
Must be a reason, but I'm lost