Checking the backup battery
Do the following:
1. Power off the computer,and unplug the ac adapter
from it.
2. Remove the battery pack (for the removal procedure,
see “1010 Battery pack”on page 56).
3. Remove the backup battery (for the removal procedure,
see “1060 Backup battery and sub-battery”on
page73).
4. Measure the voltage of the backup battery.See the
following figure.
Wire Voltage(V dc)
Red +2.5 to +3.2
Black Ground
vIf the voltage is correct, replace the system board.
vIf the voltage is not correct, replace the backup battery.
vIf the backup battery discharges quickly after
replacement, replace the system board.
Checking the sub-battery
Do the following:
1. Recharge the sub-battery; it might have been
discharged.
2. Power off the computer,and unplug the ac adapter
from it.
3. Remove the battery pack (for the removal procedure,
see “1010 Battery pack”on page 56).
4. Remove the sub-battery (for the removal procedure,
see “1060 Backup battery and sub-battery”on
page73).
5. Measure the voltage of the sub-battery.See the
following figure.
Wire Voltage(V dc)
Red +6.0 to +9.0
Black Ground
vIf the voltage is correct, replace the system board.
vIf the voltage is not correct, replace the sub-battery .
vIf the sub-battery discharges quickly after replacement,
replace the system board.
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General descriptions 31