Acer HARLEY TAB A3-A20 Service Manual page 82

 rd test----Headset Test: Click on ―Pass‖ button and enter into this test, which is to check its
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normality. Insert the headset before test, and say some words to the receiver of the headset. After three
seconds, listen whether the headset makes the same sound, so as to prove its validity. If the headset
MIC works normally, press the hang-up key, and the corresponding headset key will show ―press‖. Click
on ―Pass‖ if the headset hang-up key is normal.
 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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