Acer 5553 ユーザーズマニュアル

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Chapter 3
Removing the Mainboard
1.
2.
3.
4.
Turn the computer over and disconnect the power cable from the mainboard.
5.
Turn the computer over and remove the one (1) screw of the mainboard.
Step
Screw
Quantity
Screw Type.
Mainboard 
Disassembly
M2.5*5
1