Testing the AC Adapter (8554)

Testing the AC Adapter

If the Power-On indicator is not on, check the power cord of the AC adapter for proper installation and continuity.

If any noise can be heard from the AC adapter when it is plugged into line voltage, replace the AC adapter with a new one.
If no noise can be heard from the adapter, go to Step 2.
If the noise still comes from the new AC adapter, suspect the computer. Replace the AC adapter with the original one, then go to the next step. If no noise comes from the new adapter, the original adapter has the problem.
Unplug the AC adapter cable from the computer and measure the output voltages at the plug of the AC adapter cable. Connect the minus lead of the volt-ohm meter to pin 3 during the measurement.

Pin Voltage (Vdc) 1 +18 to +22 2 +17 to +21 3 GND 4 Communication GND

Pin	Voltage (Vdc)
1	+18 to +22
2	+17 to +21
3	GND
4	Communication GND

If the voltages are not correct:
1. Unplug the AC adapter from the ac power outlet and leave it for a few minutes.
2. Plug the AC adapter into the ac outlet.
3. Measure the output voltages of the AC adapter.
4. If the voltages are still not correct, replace the AC adapter.
If the voltages are OK, plug the cable into the computer and try the failing operation again.

If the problem still remains, replace the voltage converter. If the problem disappeared, suspect the installation and continuity of the AC adapter cable.

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