Possible causes:

A. The power supply is not connected;

B. The safety tube is burnt out;

C. Poor connection or open circuit of high-frequency cable;

D. Transducer circuit fault;

E. The circuit board is burnt out;

F. Other reasons.

Treatment measures:

a. Check and plug in the power supply;

b. Confirm that the power supply voltage is appropriate and replace the fuse tube of the same specification;

c. Connect the high-frequency cable or replace the cable;

d. Check the line or consult customer service;

e. Find out which component is burnt out, replace the component or directly replace the board;