Amplifier fault on X axis.

Fadal VMC 6030 CNC88HS. Powered up, select 'Jog', amplifier fault message on whatever axis I select. Power down, hooked a jumper on the 1100-1b board,right side of fuses, between 12 and 16 to bypass stop condition. Powered up, 'Jog', select Z and move, select Y and move, select X and 'amplifier fault X axis. Swap axis cards, no change. Had motor rebuilt ($$) no change.

The amp that had initially tested good, now proved to be defective. Replaced it (X axis), and with the rebuilt motor, and alarms were cleared, all axis functional.