Hardware Maintenance Manual - Lenovo B580
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... computer password (making the computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following : 1. Connect the ac power adapter. 4. See the following : • Replace the system board. • If the problem persists, go to ... figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20 2 0 Note: Output voltage of pin no.2 of the ac power adapter may have been subjected to Chapter 5 "Lenovo B580" on page 37. 30 Hardware Maintenance Manual Turn off the computer. 6. Remove the battery pack. 3.
... computer password (making the computer unusable) • Sticky keys caused by spilling a liquid onto the keyboard • Use of an incorrect ac power adapter on laptop products The following : 1. Connect the ac power adapter. 4. See the following : • Replace the system board. • If the problem persists, go to ... figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20 2 0 Note: Output voltage of pin no.2 of the ac power adapter may have been subjected to Chapter 5 "Lenovo B580" on page 37. 30 Hardware Maintenance Manual Turn off the computer. 6. Remove the battery pack. 3.