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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 the built-in batteries and operational charging
This computer 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.
To check whether the battery pack charges correctly during operation, do the following:
1. Discharge the battery 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 and let them return to
room temperature.
Note: The built-in batteries are NOT customer replaceable. Contact a qualified Lenovo technician to
replace the built-in batteries.
3. Reinstall the battery pack. If the batteries are still not charging, replace the battery pack.
4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery. See "Disabling the built-in battery" on page 64
2. Remove the coin-cell battery. See "1090 Coin-cell battery and Ethernet bracket" on page 74
3. Measure the voltage of the battery. See the following figure.
(20V)
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
.
Chapter 3
General checkout
29
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