Lenovo IdeaTab S1209A Lenovo IdeaTab S2109A-F Hardware Maintenance Manual - Page 25
Power system checkout, Checking the AC adapter
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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 figure: Pin Voltage (V DC) 1 +5 2 0 2 1 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 S2109A-F" on page 24. Note: Noise from the AC adapter does not always indicate a defect. 21