Lenovo Tablet K3011W User Manual

To verify a symptom, follow the steps below:
1.  Turn off the computer.
2.  Connect the AC adapter.
3.  Make sure that power is supplied when you turn on the computer.
4.  Turn off the computer.
5.  Disconnect the AC adapter.
6.  Make sure that the battery pack supplies power when you turn on the 

computer.

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

supply checkouts:
•  “Checking the AC adapter ” on page 21
•  “Checking operational charging” on page 21

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.
If  the  computer  does  not  charge  during  operation,  go  to 

• 

To check the AC adapter, follow the steps below:
1.  Unplug the AC adapter cable from the computer.
2.  Measure the output voltage at the plug of the AC adapter cable. See the 

following figure:

2

1

+5

0

1

2

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 K3011W” on page 26.

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

To  check  whether  the  battery  charges  properly  during  operation,  use  a 

discharged battery pack or a battery pack that has less than 50% of the total 

power remaining when installed in the computer.