Check up surface:<br>(1) check up for scratches, shrinkage and particles according to the appearance inspection standard, and up shall not be deformed, dented or bulged; (2) check K / B: K / B key shall not be poorly printed, dropped, wrong or warped, lift the machine 45 °, check the keyboard shall not be floating or scratched, and no foreign matters shall be sandwiched between keys. (3) check T / P button: press two positions of left and right buttons respectively: (1) check sensitivity (not dead, not inelastic) (2) check T / P Mylar: not scratched, not higher than up surface, large seam & fault according to appearance inspection standard. Check the power on key: press the power on key with index finger to check the sensitivity; check the radium carving on the lower left side of up: no ghosting or blurring.<br>
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