Checking The Ac Power Adapter - Lenovo ThinkPad T420si Hardware Maintenance Manual

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 43
• "Checking operational charging" on page 44
• "Checking the battery pack" on page 44
• "Checking the backup battery" on page 44

Checking the ac power adapter

You are here because the computer fails only when the ac power adapter is used.
• If the power problem occurs only when the docking station or the port replicator is used, replace the
docking station or the port replicator.
• If the power-on indicator does not turn on, 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 44.
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. See the following figure:
Note: Output voltage of pin no.2 of the ac power adapter may different from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, do the following:
• Replace the system board.
• If the problem persists and your system supports the PC doctor for DOS, go to "FRU tests" on
page 39.
Note: Noise from the ac power adapter does not always indicate a defect.
Pin
Voltage (V dc)
1 +20
2 0
3 Ground
.
Chapter 3 General checkout
43