CHECKOUT GUIDE
If the voltage is not correct, replace the AC Adapter.
If the voltage is within the range, do the following:
Replace the system board.
If the problem persists, go to “Undetermined
problems” on page 51.
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 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; with 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 charged when it
is hot. In that case, remove it from the computer and
leave it at room temperature for a while. After it cools
down, reinstall it and recharge it.
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)
2
Ground
38
ThinkPad 570 Hardware Maintenance Manual
Summary of Contents for ThinkPad 2644
Page 7: ......
Page 11: ...INTRODUCTION 2 ThinkPad 570 Hardware Maintenance Manual ...
Page 64: ...FRU REMOVALS AND REPLACEMENTS 1010 Battery pack ThinkPad 570 55 ...
Page 66: ...FRU REMOVALS AND REPLACEMENTS Cable routing ThinkPad 570 57 ...
Page 71: ...FRU REMOVALS AND REPLACEMENTS 62 ThinkPad 570 Hardware Maintenance Manual ...
Page 75: ...FRU REMOVALS AND REPLACEMENTS 66 ThinkPad 570 Hardware Maintenance Manual ...
Page 88: ...FRU REMOVALS AND REPLACEMENTS ThinkPad 570 79 ...
Page 101: ...LOCATIONS Password pads 92 ThinkPad 570 Hardware Maintenance Manual ...
Page 102: ...PARTS LIST THINKPAD 570 Parts List ThinkPad 570 ThinkPad 570 93 ...
Page 111: ...PARTS LIST THINKPAD 570 102 ThinkPad 570 Hardware Maintenance Manual ...
Page 113: ...IBM Part Number 37L5191 Printed in U S A S37L 5191 ðð ...