IBM 8676 Hardware Maintenance Manual - Page 66

Replacing, assembly

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heat sink and position the heat sink on top of the microprocessor. Press firmly on the captive screws and tighten them, alternating between screws until they are tight. Do not overtighten the screws by using excessive force. Heat sink Microprocessor 2 Heat sink retaining module Microprocessor 2 VRM 9. If you have other options to install, install them now. Otherwise, continue with "Completing the installation" on page 59. Replacing a fan assembly The server comes with five replaceable fans. Attention: If a fan fails, replace it within 48 hours to help ensure adequate cooling. Complete the following steps to replace the fan assembly. Use this procedure to replace any fan in the server. Note: 1. Read "Safety information" on page 119 and "Installation guidelines" on page 37. 2. Turn off the server and all attached peripheral devices. Disconnect all power cords; then, disconnect all external signal cables from the server. 3. Remove the server from the rack; then, remove the server cover (see "Removing the cover and bezel" on page 44). Attention: When you handle static-sensitive devices, take precautions to avoid damage from static electricity. For information about handling these devices, see "Handling electrostatic discharge-sensitive devices" on page 122. 4. Determine which fan to replace by checking the LED at each fan; a lit LED indicates the fan to replace. 56 xSeries 335 Type 8676, Type 8830: Hardware Maintenance Manual and Troubleshooting Guide

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heat
sink
and
position
the
heat
sink
on
top
of
the
microprocessor.
Press
firmly
on
the
captive
screws
and
tighten
them,
alternating
between
screws
until
they
are
tight.
Do
not
overtighten
the
screws
by
using
excessive
force.
Microprocessor 2
Microprocessor 2
VRM
Heat sink
Heat sink
retaining module
9.
If
you
have
other
options
to
install,
install
them
now.
Otherwise,
continue
with
“Completing
the
installation”
on
page
59.
Replacing
a
fan
assembly
The
server
comes
with
five
replaceable
fans.
Attention:
If
a
fan
fails,
replace
it
within
48
hours
to
help
ensure
adequate
cooling.
Complete
the
following
steps
to
replace
the
fan
assembly.
Use
this
procedure
to
replace
any
fan
in
the
server.
Note:
1.
Read
“Safety
information”
on
page
119
and
“Installation
guidelines”
on
page
37.
2.
Turn
off
the
server
and
all
attached
peripheral
devices.
Disconnect
all
power
cords;
then,
disconnect
all
external
signal
cables
from
the
server.
3.
Remove
the
server
from
the
rack;
then,
remove
the
server
cover
(see
“Removing
the
cover
and
bezel”
on
page
44).
Attention:
When
you
handle
static-sensitive
devices,
take
precautions
to
avoid
damage
from
static
electricity.
For
information
about
handling
these
devices,
see
“Handling
electrostatic
discharge-sensitive
devices”
on
page
122.
4.
Determine
which
fan
to
replace
by
checking
the
LED
at
each
fan;
a
lit
LED
indicates
the
fan
to
replace.
56
xSeries
335
Type
8676,
Type
8830:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide