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The AD Power Adapter is PN: 608428-004. This adapter has the center Smart Pin. The AD Power Adapter is PN: 608428-004. This adapter has the center Smart Pin. The adapter is rating +19VDC 1.6A* The inner ring (2) voltage tests: 19.40 VDC* The smart pin (3) voltage tests: 18.81 VDC (unloaded)19.40 VDCUnloaded meaning that the volt meter does not provide the completion of a circuit. With the laptop connected, the "load" becomes present, which will reduce voltage across the smart pin. It is presumed that factors such as a charging battery or processor work on the laptop will increase the load, causing further voltage drop on the smart pin.