Caution
-
Before
you
handle
any
components,
wear
a
wrist
strap
to
ground
any
static
electricity.
If
you
perform
this
procedure
without
a
wrist
strap,
individual
components
or
the
overall
system
may
be
damaged.
For
details,
see
Note
-
Record
the
positions
of
the
cables
before
removing
them
to
ensure
that
they
are
reinstalled
correctly.
firmware
versions
displayed
for
the
current
and
reserve
XCPs
by
the
version
command
do
not
match
when
you
check
the
XCP
firmware
version
after
executing
the
testsb
command.
This
does
not
affect
system
operation.
If
you
start
the
system
when
the
current
and
reserve
XCPs
have
been
switched,
the
CMU
firmware
stored
on
the
microSD
card
is
automatically
applied.
■
The
type
of
motherboard
unit
varies
depending
on
the
number
of
CPU
clocks.
■
If
you
replace
the
microSD
card
along
with
the
motherboard
unit,
dispose
of
the
microSD
card
mounted
on
the
old
motherboard
unit
by
appropriate
means
such
as
cutting
it
with
cutting
pliers.
The
old
microSD
card
stores
the
user
information,
IP
address,
and
other
information
set
in
the
XSCF
firmware.
16.5
Removing
the
Motherboard
Unit
and
Memory
This
section
describes
the
procedure
for
removing
the
motherboard
unit.
Enable
removal
of
the
motherboard
unit
prior
to
attempting
to
remove
it.
For
details,
see
"
."
16.5.1
Accessing
the
motherboard
unit
1.
Remove
all
the
cables
connected
to
the
external
interface.
2.
Pull
the
chassis
out
of
the
rack.
For
details,
see
"
."
3.
Open
the
fan
cover.
For
details,
see
"
."
4.
Remove
the
upper
cover.
For
details,
see
"
5.
Remove
the
air
duct
and
the
PSU
backplane
cover.
For
details,
see
"
."
Chapter
16
Maintaining
the
Motherboard
Unit/Memory
191
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