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AC Adapter (30W, 40W):
1
2
AC Adapter (35W):
1
2
If the voltage is correct, replace the system
board. If the problem is not corrected, go to
“Undetermined Problems” on page 42.
If the voltage is not correct, go to the next step.
2. Unplug the AC Adapter cable from the ac power
outlet and wait five minutes or longer to allow the
protection circuit to be fully discharged and initialized.
3. Plug the AC Adapter cable into the ac power outlet.
4. Measure the output voltage of the AC Adapter.
5. If the voltage is still not correct, replace the AC
Adapter.
Note: An audible noise from the AC Adapter does not
always indicate a defective adapter.
Checking the Battery Pack
1. Power-off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 4 (−). See the
following figure.
Pin Voltage (V dc)
1 +17.1 to +18.9
2 Return
Pin Voltage (V dc)
1 +15.5 to +17.0
2 Return
30 IBM Mobile Systems HMM