Lenovo ThinkCentre M55 (English) User guide - Page 38

Identifying

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To install a memory module: 1. Open the computer cover. See "Opening the cover" on page 19. 2. Pivot the drive bay assembly upward to gain access to the system board. 3. Locate the memory connectors. See "Identifying parts on the system board" on page 20. 4. Open the retaining clips. 5. Make sure that the notch 1 on the memory module aligns correctly with the connector key 2 on the system board. Push the memory module straight down into the connector until the retaining clips close. 22 User Guide

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To
install
a
memory
module:
1.
Open
the
computer
cover.
See
“Opening
the
cover”
on
page
19.
2.
Pivot
the
drive
bay
assembly
upward
to
gain
access
to
the
system
board.
3.
Locate
the
memory
connectors.
See
“Identifying
parts
on
the
system
board”
on
page
20.
4.
Open
the
retaining
clips.
5.
Make
sure
that
the
notch
±1²
on
the
memory
module
aligns
correctly
with
the
connector
key
±2²
on
the
system
board.
Push
the
memory
module
straight
down
into
the
connector
until
the
retaining
clips
close.
22
User
Guide