Lenovo IdeaPad Tablet K1 Lenovo IdeaPad Tablet K1 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: 1 Pin Voltage (V DC) 1 +20 2 0 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 IdeaPad Tablet K1" on page 27. Note: Noise from the AC adapter does not always indicate a defect. 21

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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)
+20
0
Pin
1
2
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 IdeaPad Tablet K1” on page 27.
Note:
Noise from the AC adapter does not always indicate a defect.