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Lenovo Rectangular Power Adapter to 5.5mm Round Jack

Signal Pin

power rating 	resistance
36 W 	 7,3 kΩ
45 W 	 120 Ω
65 W 	 280 Ω
90 W 	 550 Ω
135 W  1 kΩ
170 W  1.9 kΩ
230 W  4.6 kΩ