Power System Checkout - Lenovo ThinkPad Z60m 2529 Hardware Maintenance Manual

Power system checkout

To verify a symptom, do the following:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
4. Check that power is supplied when you turn on the
computer.
5. Turn off the computer.
6. Disconnect the ac adapter and install the charged
battery pack.
7. Check that the battery pack supplies power when you
turn on the computer.
If you suspect a power problem, see the appropriate one
of the following power supply checkouts:
v "Checking the ac adapter"
v "Checking operational charging" on page 42
v "Checking the battery pack" on page 42
v "Checking the backup battery" on page 43
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:
3
2
1
(20V)
Note: Output voltage of pin no.2 of the ac adapter
may different from the one you are servicing.
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.
Pin Voltage (V dc)
1 +20
2 0
3 Ground
General descriptions
Checkout guide
41