1.Problem description:Press the manual/automatic switch button to the manual state,Z+ and Z- will go up or down normally.Switch to automatic state,pressing the autofocus button,but there is no follow and reponse.
2.Possible cause analysis of failure:Press the auto -focus button to see if the light of the WORK in the heightening box flashes or not.If it does not flash,there is a problem with the circuit.If flash,then measure the voltage of pin COM3-31 and pin 1 of the high box in the setting state to see if it is between 5.5 and 6.5.
3.Solution:Check the wires and reconnect them if there are some problems.