Star Trek: The Next Generation
Williams, 1993I've got a ST:TNG who's right side cannon doesn't recognize that it's been fired whenever a ball is shot from it. It shoots the ball just fine, and the test mode seems to see the opto sees the ball as gone, but the game play still allows the cannon to fire a second time with the game audio telling me to fire the cannon. (even though it's already been fired). If I grab the trigger and fire the cannon a second time ("Dry firing" it) game play seems normal.
Thoughts?
I'd suspect a flaky opto that detects the ball is in the cannon or the 16-opto board under the playfield has a bad connection. Reseat the connectors on the board under the playfield. Then take the cover off the right cannon and look at the optos. These can get cracked solder joints on the pads they are soldered to. Lastly, go into switch edge test and view the transmitter with a digital camera. (I find iPhones don't pick up on this for some reason). You can use a flashlight or your phone's flashlight to trigger the receiver by waving it close to the opto.
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