Red
Black
 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.
Checking the Standby Battery: Be careful not
to cause a short circuit when measuring the voltage.
1. Power-off the computer and unplug the AC Adapter
from the computer.
2. Remove the standby battery.
3. Measure the voltage of the standby battery.
 If the voltage between red and black is 3.5 V dc
or greater, the voltage is correct. Go to Step 9
on page 33 to verify standby battery operation.
 If the voltage is less than 3.5 V dc, go to the
next step.
4. Plug the AC Adapter into the computer and power-on
the computer.
5. Measure the output voltage at the connector on the
system board.
Wire Voltage (V dc)
Red +2.9 to +3.3
Black Ground
32 IBM Mobile Systems HMM
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