Chnc Turret Problem

[unalpha]

I have an early chnc and my turret only indexes to 4 positions. When any of the other 4 positions are called up the turret functions properly and turns but then it over shoots the position. I haven't had this machine very long and would like to know if anyone may have an idea what to look for.

Thanks,

[Machineblues]

What model machine? Is it the newer VDI with a servo motor.