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Checkout guide
4. Check that power is supplied when you power on the
computer.
5. Power off the computer.
6. Disconnect the ac adapter and install the charged
battery pack.
7. Check that power is supplied by the battery pack
when you power on the computer.
If you suspect a power problem, see the appropriate one
of the following power supply checkouts:
“Checking the ac adapter”
“Checking operational charging”
“Checking the battery pack” on page 11
“Checking the backup battery” on page 12
Checking the ac adapter: You are here because
the computer fails only when the ac adapter is used:
If the power problem occurs only when the port
replicator is used, replace the port replicator.
If the power-on indicator does not turn on, check the
power cord of the ac adapter for correct continuity
and installation.
If the computer does not charge during operation, go
to “Checking operational charging.”
1. Unplug the ac adapter cable from the computer and
measure the output voltage at the plug of the ac
adapter cable. See the following figure:
(16 - 10 V)
If the voltage is not correct, replace the ac adapter.
If the voltage is acceptable, do the following:
Replace the system board.
If the problem persists, go to “Product overview”
on page 13.
Note: Noise from the ac adapter does not always indicate
a defect.
Checking operational charging: To check
operational charging, use a discharged battery pack or a
battery pack that has less than 50% of the total power
remaining when installed in the computer.
Pin Voltage (V dc)
1 +15.5 to +17.0
2 Ground
10 ThinkPad 600X Hardware Maintenance Manual