MR-J2S displays "AB"

[bob dvd]

I am trying to repair Mitsubishi MR-JS-10B servo amp  It displays "AB"

I have a bunch of bad units.  Anyone know how to fix

[bob dvd]

To clarify problem unit should be displaying D# but is displaying B#

manual says it was told to turn on but it is not on.

 

[Gambit]

The servo amplifier was switched on when power to the servo system controller is off.

The axis No. set to the servo system controller does not match the axis No. set with the axis setting switch (SW1) of the servo amplifier.

A servo amplifier fault occurred or an error took place in communication with the servo system controller. In this case, the indication changes. "Ab" "AC" "Ad" "Ab" The servo system controller is faulty.