IBM Laptop MT 2632 User Manual download pdf (Page 34)

v “Checking the backup battery” on page 32

Checking the ac adapter

You are here because the computer fails only when the ac

adapter is used:

v If the power problem occurs only when the port

replicator is used, replace the port replicator.

v If the power-on indicator does not turn on, check the

power cord of the ac adapter for correct continuity and

installation.

v If the computer does not charge during operation, go to

″Checking operational charging.″

To check the ac adapter, do the following:

1. Unplug the ac adapter cable from the computer.

2. Measure the output voltage at the plug of the ac

adapter cable. See the following figure:

Pin Voltage (V dc)

1 +15.5 to +17.0

2 Ground

3. If the voltage is not correct, replace the ac adapter.

4. If the voltage is acceptable, do the following:

v Replace the system board.

v 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 whether the battery charges properly during

operation, 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 it is still

not charged, go to the next section.

Checkout guide

30 ThinkPad A21e

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IBM Laptop MT 2632 User Manual Page 34