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Checkout guide
Checking the backup battery
Do the following:
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 56).
4. Remove the backup battery (see "1130 Backup battery" on page 75).
5. Measure the voltage of the backup battery. See the following figure.
Red (+)
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
32
MT 0672, 0673, 0674, 9450, 9451, 9452, and 9453
If the resistance is not correct, replace the battery pack. If the resistance is
correct, replace the system board.
Black (-)
board.
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
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