Power System Checkout; Checking The Ideapad Tablet Ac Charger; Checking The Internal Battery Status - Lenovo IdeaPad Tablet A1-07 Hardware Maintenance Manual

A1-07 HMM_EN.book Page 21 Tuesday, January 17, 2012 5:18 PM

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 IdeaPad Tablet AC Charger" on page 21
• "Checking the internal battery status" on page 21

Checking the IdeaPad Tablet AC Charger

When you use the IdeaPad Tablet AC Charger to charge the tablet but no power
is charged, see the instructions in this topic to check the IdeaPad Tablet AC
Charger.
To check the IdeaPad Tablet 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.

Checking the internal battery status

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
Pin Voltage (V dc)
1 Ground
2 0
3 +5
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