When homing the spindle moves down, the table left, and the saddle back, all moving away from the micro switches. Then gives a Z DAC error. Changed the sign in parameters and machine parameters (BMDC 5.92) from -1 to +1 for X, Y, and Z axis to no effect. X, Y, and Z switches check out using Tuner.
Mill made in 1996 serial #8150E. Ball screw for y axis mounted on front of head. BMD ver 7, Parameter maintenance program 3.2.
What should I check next?