IBM-AUSTRIA - PC-HW-Support    30 Aug 1999

Checking the Standby Battery (765D-9546 765L-9547)

1.  Power-off the computer and unplug the AC Adapter  from the computer.
2.  Open the keyboard, 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 and remove the keyboard card.
5.  Remove the standby battery from the keyboard card.  (Refer to 'Backup Battery, Speaker, Standby Battery' to remove the battery.)
     Be careful not to cause a short circuit when measuring  the voltage.

6.  Measure the voltage of the standby battery.
   •  If the voltage between red and black  is 3.5 Vdc or greater, the voltage is  correct.  Go to step 12 to verify standby battery operation.
   •  If the voltage is less than 3.5 Vdc, go to the next step.

7.  Plug the AC Adapter  into the computer and power-on the computer.
8.  Measure the output voltage at the connector on the keyboard card with  the battery unplugged.

    
   

   Pin	Voltage (Vdc)
   +	+4.0
   -	Ground

    

   •  If the voltage is less than +4.0 Vdc,  replace the DC/DC card. If the voltage is still low, replace the system  board.
   •  If the voltage is more than +4.0 Vdc, power-off the computer,  replace the standby battery, and go to the next step.

9.  Ensure that the AC Adapter is plugged into  the computer, then power-on the computer.
10.  Charging of the standby battery starts immediately.  A depleted battery needs approximately 30  minutes to be recharged to the operational voltage of +3.5 Vdc.
11.  Unplug the AC Adapter.
12.  Verify the standby battery function by removing and installing  the battery pack during suspend mode.

    NOTE:   Removing and installing the battery pack during suspend mode should be done within one minute.  If the System does not resume after a charged battery pack is installed,  replace the DC/DC card.

     If replacing the DC/DC card does not resolve the problem, replace  the system board.

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