Four position tool post, one of the tool number would not stop rotating, while the other tool numbers works fine

1. The Hall element of this tool post is damaged. Confirm which tool post makes the tool post rotate continuously, input the command on the system to rotate the tool post, and use the multimeter to measure whether the voltage of the tool post signal contact to the 24V contact changes. If there is no change, it can be determined that the Hall element of the tool post is damaged, and the signaling disk or Hall element can be replaced.

2. The signal line of this tool post is broken, causing the system to be unable to detect the tool post signal. Check whether the connection between the tool post signal and the system is broken, and connect it correctly.

3. There is a problem with the tool post signal receiving circuit of the system. Replace the main board after confirming that the Hall element of the tool post is fine and the connection between the tool post signal and the system is fine.