Boot IC160 measuring voltage of 0 v (PQ3D13) (1) feet (5 v) for normal, vice power supply didn't work. Measure insurance R003 and R005, discover R003 (l0 Ω / 5 w) circuit. DO01 is normal, check the whole bridge D010, D011, D020. D021, Cll0, Cl01 didn't also found the problem. Estimated over-current components in IC101 (MlP286A) itself, measuring IC101 5 feet of ground resistance is small and unstable, doubt IC101 have soft breakdown phenomenon. MIP286A can't buy, try to draw the side power supply circuit diagram analysis, found MIP286A close to common TNY266PV parameters and pin is consistent, by substituting TNY266PV MIP286A, resistance R003 replacement quality insurance at the same time, check after the commissioning, the machine back to normal.8ncservice manual download site