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Power system checkout
To verify if a battery pack or an ac power adapter is functional, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac power adapter.
4. Check that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the ac power adapter and install the charged battery pack.
7. Check that the battery pack supplies power when you turn on the computer.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
•
"Checking the ac power adapter" on page 33
•
"Checking operational charging" on page 33
•
"Checking the battery pack" on page 34
•
"Checking the coin-cell battery" on page 34
Checking the ac power adapter
If your computer fails only when the ac power adapter is used, use the following instructions.
• If the power problem occurs only when the dock is used, replace the dock.
• If the system-status indicator does not blink three times when an ac power source is connected, check
the power cord of the ac power adapter for correct continuity and installation.
• If the computer does not charge during operation, go to "Checking operational charging" on page 33.
To check the ac power adapter, do the following:
1. Unplug the ac power adapter cable from the computer.
2. Measure the output voltage at the plug of the ac power adapter cable.
3
2
1
Note: Output voltage across pin 2 of the ac power adapter might differ from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, replace the system board.
Note: Noise from the ac power adapter does not always indicate a defect.
Checking operational charging
To check whether the battery pack charges correctly during operation, do the following:
1. Discharge the battery pack until the remaining battery power is less than 50%.
2. Connect the computer to ac power to charge the battery pack. If the battery status icon in the Windows
notification area indicates that the batteries are not charging, remove the battery pack and let them
return to room temperature.
3. Reinstall the battery pack. If the batteries are still not charging, replace the battery pack.
(20V)
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
.
Chapter 3
General checkout
33
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