Lenovo A2109 Tablet Manual do Utilizador descarregar pdf (Página 25)

General checkout

Power system checkout

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

supply checkouts:

• “Checking the AC adapter ” on page 21

• “Checking the battery pack ” on page 22

Checking the AC adapter

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

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

adapter for correct continuity and installation.

To check the AC adapter, follow the steps below:

1. Unplug the AC adapter cable from the tablet.

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

following gure:

Voltage (V DC)

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

are servicing.

3. If the voltage is not correct, replace the AC adapter.

4. If the voltage is acceptable, do the following:

Replace the system board.•

If the problem continues, go to • “Lenovo IdeaTab A2109A-F” on page 24.

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

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Lenovo A2109 Tablet Manual do Utilizador Página 25