Lenovo R400 User Manual - Page 62
Checking the backup battery - ac adapter
UPC - 884343017105
View all Lenovo R400 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 62 highlights
Checking the backup battery Do the following: 1. Power off the computer, and unplug the ac adapter from it. 2. Turn the computer upside down. 3. Remove the battery pack (see "1010 Battery pack" on page 84). 4. Remove the backup battery (see "1060 Backup battery" on page 92). 5. Measure the voltage of the backup battery. See the following figure. Red (+) Black (-) Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground v If the voltage is correct, replace the system board. v If the voltage is not correct, replace the backup battery. v If the backup battery discharges quickly after replacement, replace the system board. 54 ThinkPad T400 and R400 Hardware Maintenance Manual
Checking the backup battery
Do the following:
1.
Power off the computer, and unplug the ac adapter from it.
2.
Turn the computer upside down.
3.
Remove the battery pack (see “1010 Battery pack” on page 84).
4.
Remove the backup battery (see “1060 Backup battery” on page 92).
5.
Measure the voltage of the backup battery. See the following figure.
Red (+)
Black (-)
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
v
If the voltage is correct, replace the system board.
v
If the voltage is not correct, replace the backup battery.
v
If the backup battery discharges quickly after replacement, replace the system
board.
54
ThinkPad T400 and R400 Hardware Maintenance Manual