Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 144

Locating, connectors, computer, Opening, cover

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Locating connectors on the rear of the computer The following illustration shows locations of connectors on the rear of the computer. 1 Power cord connector 2 Cable lock latch 3 Rope clip (U-bolt) holes 4 PCI adapter connectors 5 Serial connectors (2) 6 Ethernet connector 7 USB connectors (2) 8 VGA monitor connector 9 Parallel connector 10 Audio line-in connector 11 Audio line-out connector 12 USB connectors (4) 13 PS/2® keyboard connector 14 PS/2 mouse connector 15 Diagnostic LEDs Opening the cover Attention Read Chapter 2, "Safety information," on page 5 and "Handling electrostatic discharge-sensitive devices" on page 8"Handling electrostatic discharge-sensitive devices" on page 314 before opening the cover. 1. Shut down your operating system, remove any media (diskettes, CDs, or tapes) from the drives, and turn off all attached devices and the computer. 2. Unplug all power cords from electrical outlets. 3. Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer. 4. Remove the floor stand, if attached. 5. If a cover lock is installed, unlock the cover. 6. Press inward on the two buttons and rotate the top cover upward as illustrated. 138 Hardware Maintenance Manual

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Locating
connectors
on
the
rear
of
the
computer
The
following
illustration
shows
locations
of
connectors
on
the
rear
of
the
computer.
±1²
Power
cord
connector
±9²
Parallel
connector
±2²
Cable
lock
latch
±10²
Audio
line-in
connector
±3²
Rope
clip
(U-bolt)
holes
±11²
Audio
line-out
connector
±4²
PCI
adapter
connectors
±12²
USB
connectors
(4)
±5²
Serial
connectors
(2)
±13²
PS/2
®
keyboard
connector
±6²
Ethernet
connector
±14²
PS/2
mouse
connector
±7²
USB
connectors
(2)
±15²
Diagnostic
LEDs
±8²
VGA
monitor
connector
Opening
the
cover
Attention
Read
Chapter
2,
“Safety
information,”
on
page
5
and
“Handling
electrostatic
discharge-sensitive
devices”
on
page
8“Handling
electrostatic
discharge-sensitive
devices”
on
page
314
before
opening
the
cover.
1.
Shut
down
your
operating
system,
remove
any
media
(diskettes,
CDs,
or
tapes)
from
the
drives,
and
turn
off
all
attached
devices
and
the
computer.
2.
Unplug
all
power
cords
from
electrical
outlets.
3.
Disconnect
all
cables
attached
to
the
computer.
This
includes
power
cords,
input/output
(I/O)
cables,
and
any
other
cables
that
are
connected
to
the
computer.
4.
Remove
the
floor
stand,
if
attached.
5.
If
a
cover
lock
is
installed,
unlock
the
cover.
6.
Press
inward
on
the
two
buttons
and
rotate
the
top
cover
upward
as
illustrated.
138
Hardware
Maintenance
Manual