Lenovo A3000 Tablet - Manual (Page 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
figure:
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 A3000” on page 24.
Note: Noise from the AC adapter does not always indicate a defect.
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