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Voltage
Regulator
Modules
The
following
procedures
describe
the
removal
and
replacement
of
the
voltage
regulator
modules.
Before
performing
the
following
procedures,
read
the
“Safety
Notices”
on
page
ix.
The
system
backplane
for
the
Model
275
contains
three
voltage
regulator
modules:
a
1.2V
VRM,
a
2.5V
VRM,
and
a
1.8V
VRM.
See
the
following
figure
for
the
location
of
each
module.
1
2
3
4
J0A
V1
V3
V2
J3B
J1A
J2B
J2A
J0B J1B
J3A
1
System
Backplane
3
2.5V
Voltage
Regulator
Module
2
1.8V
Voltage
Regulator
Module
4
1.2V
Voltage
Regulator
Module
Removing
Voltage
Regulator
Modules
To
remove
a
voltage
regulator
module,
do
the
following:
1.
Shut
down
the
system
as
described
in
“Stopping
the
System”
on
page
246.
2.
Disconnect
the
power
source
from
the
system.
Note:
This
system
may
be
equipped
with
a
second
power
supply.
Before
continuing
with
this
procedure,
ensure
that
the
power
source
to
the
system
has
been
completely
disconnected.
3.
If
you
are
removing
the
1.8V
or
2.5V
module,
disconnect
the
power
cables
from
the
primary
power
supply
and
secondary
power
supply
if
present.
4.
Place
the
system
into
the
service
position
as
described
in
“Placing
the
Model
275
into
the
Service
and
Operating
Position”
on
page
248.
5.
Remove
the
service
access
cover
as
described
in
“Removing
the
Service
Access
Cover”
on
page
249..
6.
Before
handling
any
card,
board,
or
memory
DIMM,
be
sure
to
use
your
electrostatic
discharge
strap
to
minimize
static-electric
discharge.
Refer
to
“Handling
Static-Sensitive
Devices”
on
page
244.
7.
To
access
the
voltage
regulator
module,
do
one
of
the
following:
a.
If
you
are
removing
the
1.8V
or
2.5V
module,
remove
the
primary
power
supply
and
secondary
power
supply
or
power
supply
filler
as
described
in
“Removing
a
Power
Supply
with
the
System
Power
Off”
on
page
288.
b.
If
you
are
removing
the
1.2V
module,
remove
the
fan
tray
assembly
as
described
in
“Removing
the
Fan
Tray
Assembly”
on
page
268.
8.
Locate
the
voltage
regulator
module
you
wish
to
remove.
Chapter
9.
Removal
and
Replacement
Procedures
295
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