Quoted from UNCgump:I continue to have trouble with the rear most lite up target registering hits with mere nudges of the game (and sometimes apparently at rest during gameplay). I can see no physical problem with the target structures or connections. Anyone have any idea what the hell this could be caused by? It's the only bothersome problem with my game, and I actually like to play the targets!
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Is that an original board?
Does reseating the connector on the board make it work better for a while?
Try reflowing the solder connections on the opto on the board.
If that doesn't work, I would replace the opto.
The opto block has 2 component, a transmitter (an IR LED) and a receiver (one on either end of the opto). If the circuit board joint to either of those devices develop a cold solder joint or a break develops inside the housing, they can get flaky like this.
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