Acer AC4B SM50 KB.I140A.015 用户手册

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Chapter 4

TouchPad Failure

If the TouchPad doesn’t work, perform the following actions one at a time to correct the problem. Do not 
replace a non-defective FRUs:

Internal Speaker Failure

If the internal Speakers fail, perform the following actions one at a time to correct the problem. Do not replace 
a non-defective FRUs: