Follow
the
instructions
for
the
Model
you
are
working
on:
v
Model
270
(See
page
v
Models
800
and
810
(See
page
Instructions
for
Model
270
1.
If
the
system
has
logical
partitions,
perform
this
procedure
only
from
the
Primary
partition’s
console
and
the
system
control
panel.
To
determine
if
the
system
has
logical
partitions,
go
to
before
continuing
with
this
procedure.
2.
Verify
that
your
system
unit
power
supply
is
functioning
properly.
a.
Disconnect
the
ac
power
cable
to
the
system
unit
you
are
working
on.
On
a
Model
270
with
a
7104
system
unit
expansion
attached,
disconnect
both
the
system
unit
line
cord
and
the
expansion
unit
line
cord.
b.
Disconnect
all
the
connectors
from
the
power
supply.
c.
Reconnect
the
ac
power
cable(s).
d.
Use
an
instrument
to
push
and
hold
the
button
adjacent
to
the
LED
on
the
system
unit
power
supply.
If
the
LED
shows
a
slow
blink
or
a
steady
green
light,
then
the
power
supply
is
functioning
normally.
Do
not
replace
it.
e.
Reconnect
the
cables
to
your
power
supply
and
proceed
with
the
next
step.
3.
Perform
the
following:
a.
Disconnect
the
ac
power
cable
to
the
system
unit
you
are
working
on.
On
a
Model
270
with
a
7104
system
unit
expansion
attached,
disconnect
both
the
system
unit
line
cord
and
the
expansion
unit
line
cord.
b.
Disconnect
all
the
I/O
devices
(tape,
diskette,
optical,
and
disk
units)
from
the
system
unit
you
are
working
on
by
sliding
them
partially
out
of
the
unit.
See
the
for
the
model
you
are
working
on.
c.
Remove
and
label
all
cards
installed.
d.
Reconnect
the
ac
power
cable(s)
to
the
unit
you
are
working
on.
e.
Power
on
the
system.
Does
a
power
reference
code
occur?
v
Yes:
Continue
with
the
next
step.
v
No:
Go
to
step
7
(See
page
4.
Perform
the
following:
a.
Remove
one
of
the
air
moving
devices
(AMDs)
from
the
system
unit
that
was
not
previously
removed
during
this
procedure.
(Disregard
a
AMD
SRC
if
it
occurs
during
this
step.)
b.
Power
on
the
system.
Does
a
power
reference
code
occur?
v
Yes:
Continue
with
the
next
step.
v
No:
The
AMD
you
removed
in
this
step
is
the
failing
item.
This
ends
the
procedure.
5.
Have
you
removed
all
of
the
AMDs
one
at
a
time?
v
No:
Perform
the
following:
a.
Power
off
the
system.
b.
Install
the
AMD
that
was
removed
in
step
4
(See
page
in
the
original
location.
c.
Repeat
step
4
(See
page
v
Yes:
Install
all
the
AMDs
and
continue
with
the
next
step.
6.
Perform
the
following:
a.
Power
off
the
system.
154
iSeries:
iSeries
Server
270,
800,
810,
820,
825,
830,
840,
870,
890,
SB2,
and
SB3
Hardware
Problem
Analysis
and
Isolation
