21
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:
Voltage (V DC)
+5
0
Pin
1
2
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 A2109A-F” on page 24.
Note:
Noise from the AC adapter does not always indicate a defect.
