Acer B1-720 Service Manual page 32

6. Speaker Test
Music plays for 5 seconds. When the music stops playing, tap "Pass" if the test passes, "Failure"
if the test fails, or "Retest" to redo the test.
7. Top Microphone Test
Tap the screen to start the test. When "Recording" appears, speak into the device.
Check the recorded sound quality when the screen shows "Replaying".
Judge the result by tapping "Pass" if the test passes, "Failure" if the test fails, or "Retry" to redo
the test.
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Figure 2-9. Speaker Test
Figure 2-10. Top Microphone Test
Diagnostic Utilities