Acer 12000 User Manual page 16

The retention mechanism cover only fits one way. Both shafts of
the retention mechanism and the retention mechanism cover have
a o and a oo indicator. Match the O on the cover with the O on the
retention mechanism first, then hooked them together and then
insert the OO side to the retention mechanism and make sure they
are clipped.
To remove the terminator board:
1. Unclip the retention mechanism cover.
2. Flip up both the plastic ear of the terminator board.
procedure detaches the terminator board from the socket.
3. Lift up and remove the terminator board.
Refer to section 1.6.3 for the illutrations.
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User's Guide