Power System Checkout; Checking The Ac Power Adapter - Lenovo ThinkPad X1 Hardware Maintenance Manual

• If you have created the bootable diagnostic medium on a USB device, do the following:
1. Attach the USB device to the computer.
2. Turn on the computer. If the computer cannot be turned on, go to "Power system checkout" on page
34, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on
page 42 for error code descriptions and troubleshooting hints.
3. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot
Menu window opens, release the F12 key.
4. Use the arrow keys to select USB HDD and then press Enter. The diagnostic program will be
launched automatically.
5. Follow the instructions on the screen to use the diagnostic program.
• If you have created the bootable diagnostic medium on a CD, do the following:
1. Turn on the computer. If the computer cannot be turned on, go to "Power system checkout" on page
34, and check the power sources. If an error code is displayed, go to "Symptom-to-FRU index" on
page 42 for error code descriptions and troubleshooting hints.
2. Insert the CD into the optical drive.
3. Restart the computer.
4. When the ThinkPad logo is displayed, repeatedly press and release the F12 key. When the Boot
Menu window opens, release the F12 key.
5. Use the arrow keys to select ATAPI CDx (x: 0, 1, ...) and then press Enter. The diagnostic program
will be launched automatically.
6. Follow the instructions on the screen to use the diagnostic program.

Power system checkout

To verify a symptom, do the following:
1. Turn off the computer.
2. Connect the ac adapter.
3. Turn on the computer. Then press F1 to enter the ThinkPad Setup program.
4. Check that power is supplied when you turn on the computer.
5. Insert a straightened paper clip into the emergency reset hole to reset the computer. Confirm the
system is still powered on.
6. Turn off the computer.
7. Disconnect the ac adapter.
8. 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 34
• "Checking operational charging" on page 35
• "Checking the backup battery" on page 35

Checking the ac power adapter

You are here because the computer fails only when the ac power adapter is used.
• If the ac power status 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 35.
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:
34
Hardware Maintenance Manual