No head or needle out of the head is abnormal:
(1) Check the pressure of the relief valve is normal (normal value is 2-4 atmospheres);
(2) Check whether the air line is connected, whether there is air leakage at the needle sleeve connection, and whether the air pipe connector is inserted well;
(3) Use a manual test to see if the needle vibration is working and see if the needle valve vibration is normal;
(4) Check the circuit board, solenoid valve frequency and duty adjustment potentiometer is adjusted properly. W1 adjusts the frequency and W2 adjusts the duty cycle. After adjustment, the voltage between the upper right corner of the control board “24-” and the MAC is less than 9.6V.
