Checking the Standby Battery (TP-770 - 9548/49)

1.  Power off the computer and unplug the AC Adapter from the computer.
2.  Remove the battery pack and keyboard.
3.  Remove the standby battery. (Refer to 'Standby Battery' to remove the battery.)

     Be careful not to cause a short circuit when measuring the voltage.

4.  Measure the voltage of the standby battery.
   •  If the voltage between red and black wire of the battery 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.

     Be careful not to cause a short circuit when measuring the voltage.

6.  With the battery unplugged, measure the output voltage at the connector.

    
   

   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 immediately. 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.

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