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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 78).
4. Remove the backup battery (see “Checking the battery
pack” on page 48).
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.
Checkout guide
General descriptions 49