a.
Power
off
the
frame
or
system
that
you
are
working
on.
Frames
with
FC
5078
or
FC
0578
attached
-
trace
and
remove
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
b.
Disconnect
all
the
I/O
devices
(tape,
diskette,
optical,
and
disk
units)
from
the
unit
that
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
of
the
cards
that
are
installed
in
the
PCI
card
area.
d.
Power
on
the
frame
or
system
that
you
are
working
on.
Frames
with
FC
5078
or
FC
0578
attached
-
reconnect
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
Does
a
power
reference
code
occur?
v
Yes
:
Continue
with
the
next
step.
v
No
:
Go
to
step
10
(See
page
3.
Perform
the
following:
a.
Power
off
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
FC
0578
attached
-
trace
and
remove
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
b.
Remove
all
power
supplies
except
first
one
in
order
(P00
or
P01).
c.
Power
on
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
FC
0578
attached
-
reconnect
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
Does
a
power
reference
code
occur?
v
No
:
Continue
with
the
next
step.
v
Yes
:
Go
to
step
5
(See
page
4.
Perform
the
following:
a.
Power
off
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
FC
0578
attached
-
trace
and
remove
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
b.
Reconnect
the
next
power
supply,
in
order,
that
you
removed
in
3
(See
page
c.
Power
on
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
FC
0578
attached
-
reconnect
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
Does
a
power
reference
code
occur?
v
No
:
Repeat
this
step
until
all
power
supplies
have
been
reconnected.
This
ends
the
procedure.
v
Yes
:
Exchange
the
power
supply
that
you
reconnected
in
this
step.
This
ends
the
procedure.
5.
Perform
the
following:
a.
Power
off
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
FC
0578
attached
-
trace
and
remove
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
b.
Remove
the
the
power
supply
left
installed
in
step
3b
(See
page
c.
Reconnect
the
next
power
supply
in
order
installed.
d.
Power
on
the
frame
or
system
that
you
are
working
on.
Frames
with
an
FC
5078
or
0578
attached
-
reconnect
the
lower
frame
power
supply
ac
jumper
cables
at
the
AC
input/battery
charger,
or
at
the
AC
modules.
Does
a
power
reference
code
occur?
v
Yes
:
Continue
with
the
next
step.
Analyze
hardware
problems
161