If the ATC is not home or ready, YOU CAN NOT EXECUTE ANY PROGRAM. If this is an early MV55, it may not have a motor to turn the ATC arm. Some early machines had a hydraulic rack for 60deg and 180deg. Those are really a pain to do.
You can try holding the feed hold button down while turning the edit key switch. I can't remember when this feature started but that put the machine in field adjust mode. (the feed hold light should flash) Then try the M31. Your machine may be to old for that. not sure.
If it it a hydraulic style, you need to go through the manual and find what rack (60 or 180) is not home. You also need to check the pot up diag. and spindle clamp diag. If you ARE VERY CAREFUL on this style machine you can manually operate the solenoid on the valve. |