Acer 5553 ユーザーズマニュアル

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Chapter 4

Built-In Keyboard Failure

If the built-in Keyboard fails, perform the following actions one at a time to correct the problem. Do not replace 
non-defective FRUs:

Start

Keyboard properly

connected?

No

Disconnect and

reconnect

Keyboard functioning?

No

Replace Keyboard

Replace

mainboard