Lenovo 7449F9U User Manual - Page 62
Checking the backup battery
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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 "1020 Battery pack" on page 86). 4. Remove the backup battery (see "1090 Backup battery" on page 104). 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 X200 Tablet and X201 Tablet 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 “1020 Battery pack” on page 86).
4.
Remove the backup battery (see “1090 Backup battery” on page 104).
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 X200 Tablet and X201 Tablet Hardware Maintenance Manual