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c. Replace the DC/DC card.

d. If the problem is not corrected, replace the

system board.

e. If the problem persists, go to “Undetermined

Problems” on page 48.

2. Unplug the AC Adapter cable from the ac power

outlet and wait 5 minutes or longer to allow the

overvoltage 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 defect.

Battery Checkout: If the error is due to the battery,

do the following:

1. Turn off the computer.

2. Remove the battery and measure the voltage

between the battery terminals 1 (+) and 4 (−).

Note: Signal lines not used in these steps are used

for communication between the system and

the battery.

3. If the voltage is less than +11.0 V dc, the battery has

been discharged. Recharge the battery.

If the voltage is still less than +11.0 V dc after

recharging, replace the battery.

Note: The voltage of the battery could show 0 V

because of the overdischarge protection

circuit. Try to trickle charge the battery by

attaching it to the computer with the AC

adapter.

Terminal Voltage (V dc) / Signal

1 +0 to +13.5

4 Ground (−)

30 IBM ThinkPad 380XD, 385XD

IBM ThinkPad 380XD Hardware Maintenance Manual

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