If worse comes to worst, Radio Shack sells infrared sensors so you can see whether or not the board is putting out a beam. If it isn't, check for 5v somewhere on the board (not too familiar with Oscar controls so I don't know where to test).
EDIT: I forgot to mention that all that the IR sensor is is a light-sensitive strip of laminated paper with some sensitive material on an end of it that shows where the beam is striking. Not high tech, but cheap (a buck or two if I remember).
Good luck, and welcome to the forum!
APf