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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 illustration:
3
2
1
Note: Output voltage of 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 external battery pack and the operational charging
Checking the external battery pack
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
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.
Note: If the external battery pack becomes hot, it may not be able to charge. Remove it from the computer
and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
To check the external battery pack, do the following:
1. Power off the computer.
2. Remove the external battery pack and measure the voltage between battery terminals 1 (+) and 7
(-). See the following figure:
1(+)
3. If the voltage is less than +11.0 V dc, the external battery pack has been discharged.
If the voltage is still less than +11.0 V dc after recharging, replace the external battery pack.
(20V)
7(-)
6(-)
5
3 4
2(+)
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
®
notification area to check the battery status.
Terminal
Voltage (V dc)
1, 2
+ 0 to + 12.6
6, 7
Ground (-)
.
Chapter 3
General checkout
27
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