Hardware Maintenance Manual
Page 8
...safety precautions when you may prevent a current from their equipment, rubber floor mats that has hazardous voltages. • Disconnect all power before: - Power supply units - Blowers and fans - keep the other hand in your electrical hand tools for safe operational condition. • Do ... Observe the following rules when working with powered-on electrical equipment; Important: Use only approved tools and test equipment. Some hand tools have , near power supplies - Many customers have handles covered with live electrical circuits with the power on when they are in the off ...
...safety precautions when you may prevent a current from their equipment, rubber floor mats that has hazardous voltages. • Disconnect all power before: - Power supply units - Blowers and fans - keep the other hand in your electrical hand tools for safe operational condition. • Do ... Observe the following rules when working with powered-on electrical equipment; Important: Use only approved tools and test equipment. Some hand tools have , near power supplies - Many customers have handles covered with live electrical circuits with the power on when they are in the off ...
Hardware Maintenance Manual
Page 9
... another person to protect users and service technicians from injury. Check the power cord for any obvious non-Lenovo alterations. Check inside the unit for : a. Check that are sensitive to the safety of every service task. Handling devices that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with...
... another person to protect users and service technicians from injury. Check the power cord for any obvious non-Lenovo alterations. Check inside the unit for : a. Check that are sensitive to the safety of every service task. Handling devices that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with...
Hardware Maintenance Manual
Page 36
... correct continuity and installation. • If the computer does not charge during operation, go to Chapter 5 "Lenovo B590" on page 31 Checking the ac power adapter You are servicing. 3. Connect the ac power adapter. 4. Check that the battery pack supplies power when you turn on the computer. See the following figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20...
... correct continuity and installation. • If the computer does not charge during operation, go to Chapter 5 "Lenovo B590" on page 31 Checking the ac power adapter You are servicing. 3. Connect the ac power adapter. 4. Check that the battery pack supplies power when you turn on the computer. See the following figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20...