4. If the voltage is more than +11.0 V dc, measurethe resistance between battery
terminals 5 and 7. The resistance must be 4 to 30 K .
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. Turnthe computer upside down.
3. Remove the battery pack (see “1010 Battery pack” on page 68).
4. Remove the backup battery (see “1090 Backup battery” on page 86).
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
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.
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