IBM MT 2643, Hardware Manual

Page: 34 / 116

Checkout guide
(16 - 10 V)
If the voltage is not correct, replace the ac adapter.
If the voltage is acceptable, do the following:
Replace the system board.
If the problem persists, go to “Product overview”
on page 35.
Note: 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 the
system board. Then reinstall the battery pack. If the
reinstalled battery pack is not charged, go to the next
section.
Checking the battery pack:
Battery charging
does not start until the Fuel Gauge shows that less than
95% 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.
Note: The battery pack might not be able to charge when
it is hot. If it is hot, remove it from the computer
and after it cools down, reinstall and recharge it.
To check the battery pack, 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:
Pin Voltage (V dc)
1
+
15.5 to
+
17.0
2 Ground
30
ThinkPad 570 and 570E Hardware Maintenance
Manual