Checkout guide
Checking the battery pack:
Battery charging
does not start until the Power Meter 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.
To check the status of your battery, move your cursor to
the Power Meter icon in the icon tray of the Windows
taskbar and wait for a moment(but do not click), and the
percentage of battery power remaining is displayed. To
get detailed information about the battery, double-click the
Power Meter icon.
Note: If the battery pack becomes hot, it may not be able
to charge. Remove it from the computer and leave
it at room temperature for a while. 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 5 (
−
). See the
following figure:
5
3. If the voltage is less than
+
11.0 V dc, the battery pack
has been discharged.
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 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
5
Ground (
−
)
28
ThinkPad T20 HMM
Summary of Contents for ThinkPad T20
Page 1: ...S19K 2331 00 IBM Mobile Systems ThinkPad T20 2647 2648 Hardware Maintenance Manual March 2000 ...
Page 34: ...Checkout guide 30 ThinkPad T20 HMM ...
Page 64: ...Removing and replacing a FRU 6 5 4 4 5 6 7 6 60 ThinkPad T20 HMM ...
Page 88: ...Removing and replacing a FRU 3010 ThinkPad Dock PCI cover 1 1 2 84 ThinkPad T20 HMM ...
Page 92: ...Removing and replacing a FRU The release button works correctly 88 ThinkPad T20 HMM ...
Page 108: ...IBM Part Number 19K2331 Printed in U S A S19K 2331 ðð ...