After the system has been working for a long time, When the cutting head is in the following state, overshoot Or severe jitter

1.Possible cause analysis of failure:
The capacitance sensor parameters have changed. Capacitance
Sensors and amplifiers need to be re-calibrated.
After working for a long time, the nozzle of the cutting head dirt and capacitive sensor structure has changed, causing the capacitive sensor.The characteristics have changed, it will cause this situation, the original calibration is required at this time,that is, at a distance of 1.1 mm from the metal plate (Make the cutting head in a stable state), adjust the potentiometer knob on the section amplifier, observe for the display window, set it to 5.5~6V.After the setting is completed, perform an automatic focusing can make the system normal.