For a machine with Ultimax (twin screen) control:
You have the Tach. and Sig. pots wound too far CCW. Wind the Tach. pot fully CW then back eight turns. wind the Sig. pot fully CW then back about five turns. Power up the servos and put your meter on DC volts and measure the voltage at the brown and orange wires on the edge of the amp being checked.
Jog the axis forward and backwards at 40IPM and adjust the Sig. pot for 0.8v in both directions (use the Bal. pot to even things up about centre i.e 0.79v one way and 0.81v the other can be balanced to get 0.8v both directions).
If there is not enough adjustment on the Sig. pot, wind the Tach. pot CW one turn and try again. When you have 0.8v in both directions, wind the Gan. pot CW until the axis just becomes unstable then back it off 3 turns.
Rinse and repeat for the other two axes.
If the machine has a BX (single screen) control you'll need to jog at 25 IPM and set the Sig. pot for 0.65v