Lenovo ThinkPad 600E Hardware Maintance Manual - June 1999: ThinkPad 600, 600E - Page 43

Checking the Battery Pack, Terminal, Voltage V dc

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Checkout Guide 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. Note: In this case, the battery pack is over-discharged. It takes at least 3 hours to recharge the battery pack even if the indicator does not turn on. If the voltage is still less than +11.0 V dc after recharging, replace the battery. 4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 3 and 4. The resistance must be 4 to 30 K ohm. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. General Descriptions 37

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Checkout Guide
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.
Note:
In this case, the battery pack is
over-discharged.
It takes at least 3 hours to
recharge the battery pack even if the indicator
does not turn on.
If the voltage is still less than
+
11.0 V dc after
recharging, replace the battery.
4.
If the voltage is more than
+
11.0 V dc, measure the
resistance between battery terminals 3 and 4.
The
resistance must be 4 to 30 K ohm.
If the resistance is not correct, replace the battery
pack.
If the resistance is correct, replace the system
board.
Terminal
Voltage (V dc)
1
+
0 to
+
12.6
4
Ground (
-
)
General Descriptions
37