Acer Iconia One 8 Service Manual page 43

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Press G sensor verification, and check Pass result message
Remark: G sensor PASS criteria
if -0.1g<x<0.1g , and -0.1g<y<0.1g , and 0.9g<z<1.1g.
it shall pass verification test. * Here g=9.8m/(s*s)
G sensor (calibration) & G sensor verification:
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Enter the Manual UI Test in factory image mode
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Press Passive pen drawing, and check Pass result message