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7.
Remove
the
midplane
board
by
turning
the
two
midplane
thumbscrews
(1)
to
release
it;
then,
carefully
pull
the
midplane
board
out
of
its
socket
(2).
8.
To
replace
the
midplane
board,
reverse
the
previous
steps.
Midplane-board
VRM
Before
you
begin:
v
Read
“Installation
guidelines”
on
page
77.
v
Read
the
safety
notices
at
“Safety
notices
(multilingual
translations)”
on
page
201.
v
Read
“Handling
static-sensitive
devices”
on
page
200.
To
remove
the
VRM
from
the
midplane
board,
complete
the
following
steps:
1.
Turn
off
the
server
(see
“Turning
off
the
server”
on
page
8),
and
disconnect
all
power
cords
and
external
cables.
2.
Open
the
top
cover
(see
“Opening
the
cover”
on
page
88).
3.
Remove
the
memory-board
assembly.
See
“Memory
board”
on
page
115
for
details.
4.
Remove
the
shipping
thumbscrews
from
the
right
side
of
the
server,
and
lift
the
retention
bracket
from
the
server.
5.
Remove
the
processor-board
assembly.
See
“Processor-board
assembly”
on
page
119
for
details.
6.
Remove
the
PCI-X
board
assembly
from
the
server
(see
“PCI-X
board
assembly”
on
page
123),
and
place
it
on
a
clean
work
surface.
7.
Press
down
on
the
VRM-retention
bar,
and
release
the
VRM-retention
bar.
126
IBM
xSeries
450
Type
8688:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide