Spindle command error 4 meldas M3

Hey all.

I bought an Argo A-1 from 1993 with power on the backup battery
after just getting over my first problems with a dead backup battery, and getting all the parameters back in. i ran into another.

the machine can do everything but start the spindle by an M3 code.
when i do i get the "spindle command error 4"

the spindle can index when i make an tool change. and if i type "s2000 m3" in mdi mode and reset the error, i can start the spindle in jog mode with 2000rpm.

can anyone point me in an direction to fix this error.

thanks

-MMAD