4. Different engraving depth
Solution: (1) Control card was loose; (2) Stepper motor was wrong; (3) Drive was wrong; (4) Z axis lines was wrong; (5) Spindle motor was wrong; (6) Transducer was disturb; (7) Electrostatic interference; (8) Computer virus.

5. Engraving not normal
Solution: (1)Control card was loose; (2)Transducer was disturb; (3)Files route was wrong; (4)Electrostatic interfernce; (5)Software setting not OK; (6)Drive was wrong; (7)Data cable was wrong; (8)Computer virus

6. Milling not flat
Solution: (1)Spindle was vertical to working table; (2)Engraving tools problem; (3) Control card was wrong; (4)Z axis Drive was wrong.

7. Spindle stopped suddenly
Solution: (1)Inner lines short circuit in the Spindle; (2)Bucking current; (3)Transder parameters was wrong; (4)Control card was wrong; (5) Spindle cable and Data cable under short circuit.

8. Spindle moving owning noise
Solution: (1)Transducer parameters was wrong; (2)Spindle was stopped; (3)The spindle was wrong.

9. The machine can’t back to original point
Solution: (1)Opposite direction; (2)Control card was wrong; (3)Limit Switch was wrong; (4)Drive was wrong; (5)Stepper motor was wrong.

10. Spindle can’t stop
Solution: (1)Control card was wrong; (2) Transducer was wrong.