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

Checking the Standby Battery

1.  Power-off the computer and unplug the AC Adapter  from the computer.
2.  Open the keyboard, and remove the battery pack and the  diskette drive.
3.  Remove the standby battery.
4.  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 10  to verify standby battery operation.
   •  If the voltage is less than 3.5 Vdc, go to the next step.

5.  Plug the AC Adapter  into the computer and power-on the computer.
6.  Measure the output voltage at the connector on the system board.
    
   

   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.

7.  Ensure that the AC Adapter is plugged into  the computer, then power-on the computer.
8.  Charging of the standby battery starts.  A depleted battery needs approximately 30  minutes to be recharged to the operational voltage of + 3.5 Vdc.
9.  Unplug the AC Adapter.
10.  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.  The resume operation must start.  If the  resume operation does not work, switching of power from the battery  pack to standby battery  will not be correct. Replace the DC/DC card.

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

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