Power system checkout
Toverify a symptom, do the following:
1. Power off the computer.
2. Remove the battery pack.
3. Connect the ac adapter.
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 the battery pack supplies power when you
power 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 36
v“Checking the battery pack”on page 36
v“Checking the backup battery”on page 37

Checking the ac adapter

Youare here because the computer fails only when the ac
adapter is used:
vIf the power problem occurs only when the port
replicator is used, replace the port replicator.
vIf the power-on indicator does not turn on, check the
power cord of the ac adapter for correct continuity and
installation.
vIf the computer does not charge during operation, go to
“Checking operational charging”.
Tocheck 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:
2
1

(16-10V)

Pin Voltage(V dc)
1 +15.5to +17.0
2 Ground
3. If the voltage is not correct, replace the ac adapter.
4. If the voltage is acceptable, do the following:
vReplace the system board.
vIf the problem persists, go to “Product overview”on
page41.
Note: Noise from the ac adapter does not always indicate
a defect.
Checkoutguide
General descriptions 35