There are many motors to operate manually. I'm going to assume you mean the drawer. There are a number of ways of doing this. (First off, there should be a pinhole in the front for a manual ejection, if you just need it open.) There should be a round motor in the front of the drive. 9VDC will open and shut it from there. Also, you can power the drive with the proper connections in the back (5&12VDC) and the eject button on the front will work. If you do it this way, you will not need to reverse the polarity. If you jump right off the motor, you will need a three position switch to reverse the polarity to make the drive close.