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Step 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.
Step 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.
Step 5.
Turn off the computer.
Step 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 25
• "Checking the built-in battery and operational charging" on page 25
• "Checking the coin-cell battery" on page 26
Checking the ac power adapter
If 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 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 the built-in battery and operational
charging" on page 25.
Note: Noise from the ac power adapter does not always indicate a defect.
Step 1.
Connect the computer to a power outlet and turn on the computer.
Step 2.
Start the Vantage app, and then click Hardware Settings ➙ Power. The ac power adapter
information is displayed.
Ensure that you use the ac power adapter that is shipped with the computer to provide enough power to the
computer. Otherwise, a message will be displayed, prompting you that the computer will not be charged or
will be charged slowly.
Checking the built-in battery and operational charging
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized manufacturer. 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.
To check whether the battery charges properly during operation, do the following:
Step 1.
Discharge the battery to 50% or lower.
.
Chapter 3
General checkout
25
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