Lenovo IdeaTab A3000 Руководство по обслуживанию оборудования - Страница 25

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Power system checkout

If you suspect a power problem, see the appropriate one of the following power

supply checkouts:

• •

You are here because the computer fails only when the AC adapter is used.

•

To check the AC adapter, follow the steps below:

Note: Output voltage for the AC adapter pin No. 2 may differ from the one you are

servicing.

•

Note: Noise from the AC adapter does not always indicate a defect.

"Checking the AC adapter" on page 21

"Checking the battery pack" on page 22

If the power-on indicator does not turn on, check the power cord of the AC adapter

for correct continuity and installation.

Unplug the AC adapter cable from the tablet.

Measure the output voltage at the plug of the AC adapter cable. See the following

figure:

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 continues, go to "Lenovo IdeaTab A3000" on page 24.

General checkout