I have a 1990 Sabre 1250 with an 850MC with an x-axis servo motor that I put new bearings in. I marked the coupler location for the encoder and put it back together successfully however since I've had this machine i've always notices a high pitch coming from this servo when its just sitting still, the y and z do not do this so this leads me to believe the encoder could be tuned in better. After doing the bearings I turned the machine on and loosened the 4 bolts that hold the encoder on and push the slack one way or the other and I can change the tone of the noise so I'm sure there is a procedure for tuning the 4 potentiometers on the encoder. I've been searching but haven't had any luck finding anything yet. Does anyone here know the procedure or have a document they could send my way. Any help would be great.