This problem originated with an AL-12 on the spindle drive. Replaced the drive and spindle runs good now with no alarms. But won't Orient. When you Issue M19 the spindle just creeps around and never stops. Then we get a 503 Spindle orient not detected alarm spindle still doesn't stop, just keeps creeping around slowly. Swapped orient boards and get the same situation. This machine does not have a magnet on the housing near as I can see. I guess It's Internal In the spindle motor? Any Ideas how to test this thing? And If It's bad do you have to replace the spindle motor? Or is there a way to just replace the orient sensor.