Checking the AC Adapter

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 ThinkPad Port Replicator with Advanced Etherjet Feature.
If the power-on indicator does not turn on, check the power cord of the AC Adapter for correct continuity and installation.
If the operational charge does not work, go to 'Checking the Operational Charging'.

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.

Pin Voltage (Vdc) 1 for 390/i +14.5 to +17.0 for 390E +15.5 to +17.0 2 Ground

Pin	Voltage (Vdc)
1	for 390/i +14.5 to +17.0 for 390E +15.5 to +17.0
2	Ground

If the voltage is not correct, replace the AC Adapter.
If the voltage is within the range, do the following:

Note: An audible noise from the AC Adapter does not always indicate a defective adapter.

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