Follow the path of the Y-capacitor between primary ground (hot side) and secondary ground (cold side). If this capacitor shorts, the adapter will trip the house GFCI but pass a low-voltage multimeter test. The schematic identifies it as CY1 (2.2nF/250V).
Where the wall's AC voltage is converted to a high-voltage DC.
Follow the path of the Y-capacitor between primary ground (hot side) and secondary ground (cold side). If this capacitor shorts, the adapter will trip the house GFCI but pass a low-voltage multimeter test. The schematic identifies it as CY1 (2.2nF/250V).
Where the wall's AC voltage is converted to a high-voltage DC.