Checking the Backup Battery (9546, 9547)

1.  Power-off the computer and unplug the AC Adapter  from the computer.
2.  Open the keyboard, and remove the  diskette drive/CD-ROM drive, the battery pack, and the hard disk drive.
3.  Remove the top cover and keyboard unit.
4.  Open the keyboard unit, then remove the keyboard card.
5.  Remove the backup battery from the keyboard card.  (Refer to 'Backup Battery, Speaker, Standby Battery' to remove the battery.)
6.  Measure the voltage of the backup battery.  See the following figure:

Wire	Voltage (Vdc)
Red	+2.5 to +3.7
Black	Ground

•  If the voltage is correct, replace the system board.
•  If the voltage is not correct, the backup battery has been  discharged. Replace the backup battery.
•  If the backup battery discharges quickly after replacement,  replace the system board.