I've recently torn down and old printer as a learning experience and to maybe build something kinda fun out of it. As many will know that have taken apart printers, most newer ones have ceased using stepper motors and have started using a system of regular dc motors mixed with photo interrupters and optical strips to tell distance. A particular one photo interrupter I've come across a lot now has six pins out of its small black package. 2 I have determined are for the infrared led and the other 4 are for the phototransistor. Sadly, I can't find this little photo transistor on the internet and have instead resorted to the wonderful people here for some help. I removed it from the housing, figured that'd help a lot.