Lenovo TAB3 7 Essential TB3-710F Hardware Maintenance Manual - Page 25

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Power system checkout

To verify a symptom, follow the steps below:

1. Turn off the computer.

2. Remove the battery pack.

3. Connect the AC adapter.

4. Make sure that power is supplied when you turn on the computer.

5. Turn off the computer.

6. Disconnect the AC adapter and install the charged battery pack.

7. Make sure that the battery pack supplies power when you turn on the

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

supply checkouts:

• "Checking the Tab AC Charger" on page 21

• "Checking the internal battery status" on page 21

When you use the IdeaTab AC Charger to charge the tablet but no power is

charged, see the instructions in this topic to check the IdeaTab AC Charger.

To check the IdeaTab AC Charger, do the following:

1. Disconnect the micro‐USB cable from the tablet.

2. Measure the output voltage across the connector marked B of the micro‐USB

3. If the voltage is not correct, replace the micro‐USB cable.

4. If the voltage is acceptable, replace the system board.

To check the battery status of the tablet, do either of the following:

• Approximate information about the battery status

• Accurate information about the battery status

computer.

cable. Refer to the following figure:

1 2

3 (5V)

Note: The output voltage across pin 3 of the micro‐B connector might be

different from the one you are servicing.

Get the approximate status of the battery at any time by checking the battery

status icon on the system bar in the upper‐right corner of the screen. The

shorter the green bar is, the less the battery power remains.

To get the accurate information about the battery status of the tablet, do the

following:

General checkout

Voltage (V dc)

Ground