Hardware Maintenance Manual
Page 36
... power adapter cable. 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 B490" on page 37. 30 Hardware Maintenance Manual Remove the battery pack. 3. Check that the battery pack supplies power when you turn on the computer. 5. Disconnect... 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. Turn off the computer. 2.
... power adapter cable. 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 B490" on page 37. 30 Hardware Maintenance Manual Remove the battery pack. 3. Check that the battery pack supplies power when you turn on the computer. 5. Disconnect... 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. Turn off the computer. 2.