Analysis and repair: ask the user before lightning are watching the lightning from the power to enter. Folding machine inspection, no obvious traces of discharge. Tracing the path of lightning invasion resistance measurement method used to check the power switch and the output pipe are short-circuit breakdown, replacement, no further obvious open, short circuit fault. Power test, power indicator light, indicating that the switching power supply has started, but no raster no sound. Measuring the output voltage of the switching power supply is significantly higher, 90V voltage promoted to 140V; 20V voltage promoted to 26V. Replace the regulator circuit SE090 and optocoupler is also invalid. After disconnecting the load side 90V, 60W bulbs false parallel load, the voltage of 140V down to 110V. Analysis is the load circuit fault, line scan circuit is not working, mostly. Charles line drive tube be damaged knot, the line supply voltage oscillation AN5192K 51 feet only about 4V, check the power supply circuit and dropping resistor normal, measuring 51 feet on the ground resistance is small, the AN5192K by suspected lightning damage. Replacing AN5192K and promote the pipe line. Machine back to normal.Esqservice manual download site