Checkout guide
If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac adapter
from it.
2. Turn the com puter upside down.
3. Remove the battery pack (see “ 1010 Battery pack” on
page 6 4).
4. Remove the backup battery (see “Checking the battery
pack” on page 40).
5. Measure the voltage of the backup battery. See the
following figure.
• 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.
W ire Voltage (V dc)
Red +2.5 to +3.2
Blue Ground
B lue(-)
4 2 ThinkPad R40
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