Lenovo ThinkPad X1 Carbon 20HQ, Hardware Maintenance Manual

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3. Turn on the computer. If the computer can be turned on, it means that either the battery or the ac
power adapter is functional.
4. Insert a straightened paper clip into the emergency reset hole to reset the computer. If the computer is
still powered on, it means that the ac power adapter is functional.
5. Turn off the computer.
6. Disconnect the ac power adapter and turn on the computer. If the computer can be turned on, it
means that the battery is functional.
If you suspect a power problem, see the appropriate one of the following power supply checkouts:
•
“Checking the ac power adapter” on page 27
• “Checking the battery and operational charging” on page 27
• “Checking the coin-cell battery” on page 28
Checking the ac power adapter
Ensure that you use the ac power adapter that is shipped with the computer to provide enough power
to the computer.
Note: Noise from the ac power adapter does not always indicate a defect.
To check the ac power adapter, do the following:
1. Connect the computer to a power outlet and turn on the computer.
2. Check the adapter status from the following Lenovo programs:
• For Windows 10: Open the Lenovo Settings program and click Power .
• For Windows 7: Open the Power Manager program and click Battery .
If the ac power adapter is working well, adapter information will be displayed on the screen. If a
message is displayed warning that the power supply is not enough, replace the adapter with a proper
one that is supported by the computer. If you do not see any information about the adapter, replace
the adapter with a new one.
If the ac power adapter is working but the computer does not charge during operation, go to “Checking
the battery and operational charging” on page 27.
Checking the battery and operational charging
Checking the battery
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized builder. The system does not support unauthorized batteries or batteries designed for other
systems. If an unauthorized battery or a battery designed for another systems is installed, the system will
not charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
Move your pointer to the battery-status icon in the Windows notification area to check the battery status.
The battery-status icon displays the percentage of battery power remaining and how long you can use
your computer before you must charge the battery.
Checking the operational charging
To check whether the battery charges properly during operation, do the following:
1. Discharge the battery until the remained battery power is less than 50%.
Chapter 3
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General checkout
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