IBM THINKPAD T22 User Manual download pdf (Page 43)

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

page 60.)

4. Remove the backup battery (see “Checking the battery

pack” on page 36.)

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 37

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IBM THINKPAD T22 User Manual Page 43