Acer Extensa 500 Service Manual

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Machine Disassembly 
2.  To detach the hard disk module from the main unit, gently pull up to 
remove.   .
Removing the CPU Heat Sink and CPU Board
1.  Remove the 4 screws of the CPU heat sink, then gently remove the heat 
sink.
2.  First remove the CPU EMI shield, to detach and remove the CPU board 
from the system board.