Lenovo 0319A25 User Manual - Page 39

Checking the ac adapter, Checking operational charging, Checking the battery pack, not turn

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• "Checking the ac adapter" on page 33 • "Checking operational charging" on page 33 • "Checking the battery pack" on page 33 • "Checking the backup battery" on page 34 Checking the ac adapter You are here because the computer fails only when the ac adapter is used. • If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity and installation. • If the computer does not charge during operation, go to "Checking operational charging" on page 33 To check the ac adapter, do the following: 1. Unplug the ac adapter cable from the computer. 2. Measure the output voltage at the plug of the ac adapter cable. See the following figure: 3 2 1 (20V) Pin Voltage (V dc) 1 +20 2 0 3 Ground Note: Output voltage of pin no.2 of the ac adapter may different from the one you are servicing. 3. If the voltage is not correct, replace the ac adapter. 4. If the voltage is acceptable, do the following: • Replace the system board. • If the problem persists, go to "FRU tests" on page 31. Note: Noise from the ac adapter does not always indicate a defect. Checking operational charging To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer. Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack. If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is still not charged, go to the next section. Checking the battery pack Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life. To check your battery, move your cursor to the Power Manager Battery Gauge icon in the icon tray of the Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining Chapter 3. General checkout 33

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•
“Checking the ac adapter” on page 33
•
“Checking operational charging” on page 33
•
“Checking the battery pack” on page 33
•
“Checking the backup battery” on page 34
Checking the ac adapter
You are here because the computer fails only when the ac adapter is used.
•
If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity
and installation.
•
If the computer does not charge during operation, go to “Checking operational charging” on page 33
To check the ac adapter, do the following:
1. Unplug the ac adapter cable from the computer.
2. Measure the output voltage at the plug of the ac adapter cable. See the following figure:
Pin
Voltage (V dc)
1
+20
2
0
3
Ground
1
2
3
(20V)
Note:
Output voltage of pin no.2 of the ac adapter may different from the one you are servicing.
3. If the voltage is not correct, replace the ac adapter.
4. If the voltage is acceptable, do the following:
•
Replace the system board.
•
If the problem persists, go to “FRU tests” on page 31.
Note:
Noise from the ac adapter does not always indicate a defect.
Checking operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery
pack that has less than 50% of the total power remaining when installed in the computer.
Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery
pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does
not turn on, replace the battery pack.
If the charge indicator still does not turn on, replace the system board. Then reinstall the battery pack. If it is
still not charged, go to the next section.
Checking the battery pack
Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% of the
total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects
the battery pack from being overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Manager Battery Gauge icon in the icon tray of the
Windows taskbar and wait for a moment (but do
not
click), and the percentage of battery power remaining
Chapter 3
.
General checkout
33