the
FRU
locations
and
failing
components
table
in
Then,
power
on
the
system.
This
ends
the
procedure.
v
For
Models
870
or
890:
The
console
IOP
is
in
the
base
I/O
tower
for
the
system
unit.
Exchange
the
IOP
in
card
position
C01
and
then,
power
on
the
system.
See
for
locations
information,
diagrams,
and
links
to
remove
and
replace
procedures.
This
ends
the
procedure.
Bus
PIP
HSL-01:
For
use
by
authorized
service
providers.
Bus
PIP
HSL-01,
high-speed
link
-
Failure
isolation.
Use
this
procedure
to
isolate
a
failure
in
an
HSL
loop
using
HSM
or
the
SAL.
Note:
During
this
procedure,
you
will
be
disconnecting
and
reconnecting
cables.
If
errors
concerning
missing
resources
occur,
such
as
disk
units
and
HSL
failures,
ignore
them.
Missing
resources
will
report
in
again
when
the
loop
reinitializes.
Main
task:
1.
Before
powering
down
any
system
unit
or
I/O
tower,
work
with
the
customer
to
end
all
subsystems
in
all
of
the
partitions
using
each
partition’s
console.
2.
From
the
Primary
partition
,
IPL
the
system
to
DST.
Do
not
use
function
21!
3.
Be
sure
all
I/O
towers
and
system
units
on
the
loop
are
powered
on.
If
some
frames
were
powered
off,
determine
whether
the
HSL
link
error
was
cleared
up
when
the
frames
were
powered
back
on.
If
the
error
was
cleared
up,
go
to
If
a
frame
cannot
become
powered
on,
see
the
subtask
in
this
document,
then
continue
with
the
next
step
of
the
Main
task.
4.
Access
the
SAL
entry
for
this
error,
the
FRUs
should
be
listed
there.
Look
for
part
numbers
and
descriptions
for
the
FRUs
containing
the
HSL
port
for
two
frames.
There
should
also
be
a
FRU
for
the
cable
between
them.
The
locations
information
for
the
FRUs
is
the
location
of
the
failed
ports
on
the
failed
link.
If
this
information
is
not
in
the
SAL,
see
subtask
in
this
document,
then
continue
with
the
next
step
of
the
Main
task.
5.
If
the
cable
connecting
the
failed
ports
is
an
optical
cable,
clean
the
HSL
cable
connector
and
port
using
the
tools
and
procedures
listed
in
symbolic
FRU
If
that
clears
up
the
error,
go
to
If
not,
continue
with
the
next
step.
6.
There
are
now
three
cases
to
consider,
continue
with
the
appropriate
branch:
v
v
v
The
ports
on
both
ends
of
the
failed
link
are
in
a
system
unit:
1.
There
may
be
failed
hardware
that
will
report
a
different
error
on
the
other
system
unit.
Work
any
other
HSL
problems
in
the
SAL
on
the
other
system
unit.
If
the
failed
link
error
was
cleared
up
when
another
HSL
error
was
corrected,
go
to
2.
Replace
the
cable
between
the
two
system
unit
ports
on
the
failed
link.
If
the
error
was
cleared
up
by
exchanging
the
cable,
go
to
If
not,
continue
with
the
next
step.
3.
Exchange
the
FRU
containing
the
HSL
port
on
the
failed
link
in
one
of
the
system
units
(usually
the
quickest
and
easiest
to
replace).
If
the
error
was
cleared
up
by
exchanging
the
FRU
containing
the
HSL
port,
go
to
Analyze
hardware
problems
79
