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Note: Recharging will take at least 3 hours, 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 4 and 5. The
resistance must be 4 to 30 K
.
If the resistance is not correct, replace the battery
pack. If the resistance is correct, replace the system
board.
Checking the backup battery
Do the following:
1. Power off the computer, and unplug the ac adapter
from it.
2. Turn the computer upside down.
3. Remove the battery pack (see “1010 Battery pack” on
4. Remove the backup battery (see “Checking the battery
5. Measure the voltage of the backup battery. See the
following figure.
Red (+)
Black (-)
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
v
If the voltage is correct, replace the system board.
v
If the voltage is not correct, replace the backup battery.
v
If the backup battery discharges quickly after
replacement, replace the system board.
Checkout guide
General descriptions
41
Summary of Contents for ThinkPad T40 series
Page 6: ...2 MT 2373 2374 2375 2376 2378 2379...
Page 46: ...Checkout guide 42 MT 2373 2374 2375 2376 2378 2379...
Page 121: ...5 4 Removing and replacing a FRU ThinkPad T40 T40p T41 Series 117...
Page 134: ...4 4 continued Removing and replacing a FRU 130 MT 2373 2374 2375 2376 2378 2379...
Page 135: ...5 5 continued Removing and replacing a FRU ThinkPad T40 T40p T41 Series 131...
Page 143: ...1 2 3 4 5 6 7 8 9 15 10 11 12 13 14 18 16 17 Locations ThinkPad T40 T40p T41 Series 139...
Page 171: ...LCD FRUs 1 b a 2 5 c d 3 7 8 9 4 Parts list ThinkPad T40 T40p T41 Series 167...
Page 188: ...Part Number 13N5911 1P P N 13N5911...