1. The signaling disk is not aligned. Remove the tool holder cover, rotate and adjust the signaling disk position, align the Hall element of the tool holder with the magnetic block, and stop the tool position at the correct position. The system anti-lock time is not long enough. Adjust the system anti-lock time parameters. Mechanical locking mechanism failure. Disassemble the tool holder and adjust the locking mechanism. Check whether the positioning pin is broken;

2. The Hall element of this tool position is damaged. Confirm which tool position makes the tool holder rotate continuously. Rotate the tool position on the system and use a multimeter to measure whether the voltage of the tool position signal contact to the +24V contact changes. If there is no change, it can be determined that the tool position is broken. Replace the signaling disk or the Hall element. The signal line of this tool position is broken, causing the system to be unable to detect the tool position arrival signal. Check whether the connection between the tool position signal and the system is broken. The system's tool position signal reception is determined to be OK. Replace the mainboard circuit after confirming that the tool Hall element is OK and the connection between the tool position and the system signal is OK.