Lenovo ThinkPad X1 Carbon Hardware Maintenance Manual - ThinkPad X1 Carbon - Page 38
Measure the voltage of the backup battery. See the following illustration. - battery replacement
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3. Measure the voltage of the backup battery. See the following illustration. Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground • If the voltage is correct, replace the system board. • If the voltage is not correct, replace the backup battery. • If the backup battery discharges quickly after replacement, replace the system board. 32 Hardware Maintenance Manual
3. Measure the voltage of the backup battery. See the following illustration.
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
•
If the voltage is correct, replace the system board.
•
If the voltage is not correct, replace the backup battery.
•
If the backup battery discharges quickly after replacement, replace the system board.
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Hardware Maintenance Manual