1. The spindle motor to drive three-wire cable from the connector. Workaround: re-insert or re-connect and try again.
2. The engraving machine spindle motor to open the inner lead bonding. Confirmation Method: multimeter between the spindle motor three core outlet resistance. Solution: Remove the socket to open the heavy weld wire.
3. The spindle motor to drive three-wire cable break. Confirmation Method: multimeter resistance between both ends of the cable plug. Solution: The disconnection of the connected or change line.