Acer HARLEY TAB A3-A20 Service Manual page 84

6.6 Vibration----Vibrating Motor Test
 After entering into the test, the motor will vibrate. Click on ―Pass‖ if it does.
 After the test is done, click on ―Pass‖ or ―Fail‖ button to exit the test. Test result will be automatically
written into ―/sdcard/Factory/Diagnostic/ _TestResult.txt‖.
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