Having a problem with my recently aquired 1991 Cincinnati Sabre 750 VMC, 850 acromatic control. When I power up the machine and enable the hand wheel to line up the alignment marks I can not move the z-axis. The x-axis and y-axis will move but the z will not. I can power feed the z upwards, but not downwards until the tool changer has been aligned, but I need to align the axis before the changer. I may have reset a breaker switch in the control panel that disabled the z-axis hand wheel movement? I reset all of the switches in the panel, looked over all the wiring, wondering if I need to enable z-axis hand wheel movement some how? I am new to cincinnati's, but have cnc experience with fanuc and okuma's. Any ideas will be appreciated, thanks for the help.