Lenovo ThinkPad Edge E135 Hardware Maintenance Manual - Page 34

Remove the battery pack see 1010 Battery pack

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3. Remove the battery pack (see "1010 Battery pack" on page 54). 4. Remove the backup battery (see "1140 Thermal fan assembly and backup battery" on page 72). 5. 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. 28 Hardware Maintenance Manual

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3. Remove the battery pack (see “1010 Battery pack” on page 54).
4. Remove the backup battery (see “1140 Thermal fan assembly and backup battery” on page 72).
5. 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.
28
Hardware Maintenance Manual