Ok - another quirk that has me completely stumped - probably with the simplest of answers. This Star Trek has an alltek board in it.
When the game starts (or in any test mode) the lower middle bumper pulls in and vibrates. Sometimes it will rapid fire. Also, usually on each initial pulse of the coil, the right bumper fires as well, but does not hold down...neither "lock" on as if the transistor is fried, just pulse rapidly.
Here's the weird part - if i CLOSE the contacts on the bumper spoon switch, the coil releases and all is well. Both other bumper coils work fine. When I let the switch open, it immediately starts the behavior again. Almost behaves exactly opposite from what it is supposed to do.
From what I can tell the wiring is good, but maybe I am missing something.
Thanks all -
-scott