Dell Vostro 420 Service Manual page 127

NOTICE:
Socket pins are delicate. To avoid damage, ensure that the processor is
aligned properly with the socket, and do not use excessive force when you install
the processor. Be careful not to touch or bend the pins on the system board.
10
9
tab
1
processor
3
retention latch
5
processor pin-1 indicator
7
retention hook
9
2 Pivot the release lever fully and ensure that the processor cover remains
raised.
3 Orient the two alignment notches on the processor with the two alignment
notches on the socket.
4 Align the pin-1 corners of the processor and socket, and set the processor
lightly in the socket, ensuring that the processor is positioned correctly.
8
7
processor cover
2
processor socket
4
release lever
6
alignment notch
8
alignment notch
10
1
2
3
Processor
4
5
6
127