Lenovo ThinkPad 770 Hardware Maintenance Manual for 770 series notebooks(Janua - Page 43

Checking Operational Charging, Checking the Battery Pack, Terminal, Voltage V dc

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CHECKOUT GUIDE If the problem is not corrected, go to "Undetermined Problems" section of each model. Note An audible noise from the AC Adapter does not always indicate a defect. Checking Operational Charging: To check operational charging, 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 either the system board or DC-DC card that the battery is connected to. Then reinstall the battery pack. If the reinstalled battery pack is not charged, go to the next section. Checking the Battery Pack: Battery charging will not start until the Fuel-Gauge shows that less than 95% of the total power remains; with this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or having a shortened life. Do the following: 1. Power off the computer. 2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 4 (−). See the following figure: Terminal 1 4 Voltage (V dc) + 0 to + 12.6 Ground (−) 3. If the voltage is less than +11.0 V dc, the battery pack has been discharged. Recharge the battery pack. General Descriptions 37

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CHECKOUT GUIDE
±
If the problem is not corrected, go to
“Undetermined Problems” section of each model.
Note
An audible noise from the AC Adapter does not
always indicate a defect.
Checking Operational Charging:
To check
operational charging, 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 either
the system board or DC-DC card that the battery is
connected to.
Then reinstall the battery pack.
If the
reinstalled battery pack is not charged, go to the next
section.
Checking the Battery Pack:
Battery charging will
not start until the Fuel-Gauge shows that less than 95% of
the total power remains; with this condition the battery
pack can charge to 100% of its capacity.
This protects the
battery pack from being overcharged or having a
shortened life.
Do the following:
1.
Power off the computer.
2.
Remove the battery pack and measure the voltage
between battery terminals 1 (
+
) and 4 (
-
).
See the
following figure:
3.
If the voltage is less than
+
11.0 V dc, the battery pack
has been discharged.
Recharge the battery pack.
Terminal
Voltage (V dc)
1
+
0 to
+
12.6
4
Ground (
-
)
General Descriptions
37