Serial port problems, Serial, Port – Lenovo 6446 User Manual
Page 89: Problems
v
Follow
the
suggested
actions
in
the
order
in
which
they
are
listed
in
the
Action
column
until
the
problem
is
solved.
v
See
the
parts
listing
in
the
Hardware
Maintenance
Manual
to
determine
which
components
are
customer
replaceable
units
(CRU)
and
which
components
are
field
replaceable
units
(FRU).
v
If
an
action
step
is
preceded
by
“(Trained
service
technician
only),”
that
step
must
be
performed
only
by
a
trained
service
technician.
Symptom
Action
The
server
does
not
turn
off.
1.
Turn
off
the
server
by
pressing
the
power-control
button
for
5
seconds.
2.
Restart
the
server.
3.
If
the
server
fails
POST
and
the
power-control
button
does
not
work,
disconnect
the
power
cord
for
20
seconds;
then,
reconnect
the
power
cord
and
restart
the
server.
Attention:
In
a
dc
power
environment,
only
trained
service
personnel
other
than
Lenovo
service
technicians
are
authorized
to
connect
or
disconnect
power
to
the
dc
power
supply.
See
the
documentation
that
comes
with
each
dc
power
supply.
4.
If
the
problem
remains,
suspect
the
system
board.
The
OVER
SPEC
LED
on
the
light
path
diagnostics
panel
is
lit,
and
the
one
of
the
power
channel
LEDs
on
the
system
board
is
lit.
See
the
power
troubleshooting
table
in
the
Hardware
Maintenance
Manual
or
call
for
service.
The
server
unexpectedly
shuts
down,
and
the
LEDs
on
the
operator
information
panel
are
not
lit.
See
“Solving
undetermined
problems”
in
the
Hardware
Maintenance
Manual
.
Serial
port
problems
v
Follow
the
suggested
actions
in
the
order
in
which
they
are
listed
in
the
Action
column
until
the
problem
is
solved.
v
See
the
parts
listing
in
the
Hardware
Maintenance
Manual
to
determine
which
components
are
customer
replaceable
units
(CRU)
and
which
components
are
field
replaceable
units
(FRU).
v
If
an
action
step
is
preceded
by
“(Trained
service
technician
only),”
that
step
must
be
performed
only
by
a
trained
service
technician.
Symptom
Action
The
number
of
serial
ports
that
are
identified
by
the
operating
system
is
less
than
the
number
of
installed
serial
ports.
1.
Make
sure
that:
v
Each
port
is
assigned
a
unique
address
in
the
Configuration/Setup
Utility
program
and
none
of
the
serial
ports
is
disabled.
v
The
serial-port
adapter
(if
one
is
present)
is
seated
correctly.
2.
Reseat
the
serial
port
adapter,
if
one
is
present.
3.
Replace
the
serial
port
adapter,
if
one
is
present.
Chapter
5.
Solving
problems
75