Help with sensor curcuit - CR Encoder
At a guess, that's a very specialized 2-channel reflective optical sensor, which is optimized for use as a quadrature encoder. I do hope you kept the motor and wheel.

Looking at your middle picture, it's likely that the lower pin, with its associated large trace, is ground. The two middle pins are obviously the sensor outputs, which leaves the top pin as the power. I'd suggest you try 5 volts. 

Assuming I'm right, the optical spacing of the two channels is very specific to the line spacing on the code wheel, so you're unlikely to get much use out of the board, except perhaps as a simple proximity detector.