help with servo motor

Hi ALL; I got this motor from a junked printer. It´s a Nidec Model 50M060B, so a Servo Motor. It has a five cable connector ( Vcc, Gnd, FGS Out, /ACC, /DEC ) and a BD6761FS controller. Figuring this could be a real hassle for me ( or is it easy? ). I took the cover off so I can see 3 connections to the poles inside, measured but got no continuity between any to Vcc or Gnd. As far as I understand it can be controlled with a pot and a PWM generator, but how can I identify the connections? Possible to damage it by trial and error? Thanks, Alberto from Venezuela.

BTW, I remember a button " topics posted in ", doesnt work?