Chapter
2.
Maintenance
Analysis
Procedures
(MAPs)
This
chapter
provides
diagnostic
steps
for
detecting
power
problems
in
the
rack.
Use
these
power
MAPs
only
if
you
are
directed
here
from
a
MAP
step
in
the
Diagnostic
Information
for
Multiple
Bus
Systems
.
If
your
rack
has
a
power
distribution
panel,
follow
the
instructions
for
“MAP
1520:
DC
Power
Distribution
Panel
-
Power
MAP.”
If
your
rack
has
a
power
distribution
bus,
follow
the
instructions
for
“MAP
1522:
AC
Power
Distribution
Bus
-
Power
MAP”
on
page
21.
MAP
1520:
DC
Power
Distribution
Panel
-
Power
MAP
Purpose
of
This
MAP
This
procedure
is
used
to
locate
power
problems
in
the
dc
power
distribution
panel.
If
a
problem
is
detected,
this
procedure
helps
you
isolate
the
failing
field
replaceable
unit
(FRU).
Safety
Notices
Observe
the
following
safety
notices
during
service
procedures.
DANGER
An
electrical
outlet
that
is
not
correctly
wired
could
place
hazardous
voltage
on
metal
parts
of
the
system
or
the
devices
that
attach
to
the
system.
It
is
the
responsibility
of
the
customer
to
ensure
that
the
outlet
is
correctly
wired
and
grounded
to
prevent
an
electrical
shock.
Before
installing
or
removing
signal
cables,
ensure
that
the
power
cables
for
the
system
unit
and
all
attached
devices
are
unplugged.
When
adding
or
removing
any
additional
devices
to
or
from
the
system,
ensure
that
the
power
cables
for
those
devices
are
unplugged
before
the
signal
cables
are
connected.
If
possible,
disconnect
all
power
cables
from
the
existing
system
before
you
add
a
device.
Use
one
hand,
when
possible,
to
connect
or
disconnect
signal
cables
to
prevent
a
possible
shock
from
touching
two
surfaces
with
different
electrical
potentials.
During
an
electrical
storm,
do
not
connect
cables
for
display
stations,
printers,
telephones,
or
station
protectors
for
communications
lines.
D05
CAUTION:
Energy
hazard,
remove
power
before
servicing.
Disconnect
two
power
supply
cords.
C23
Step
1520-1
Do
any
of
the
devices
in
the
rack
have
their
power
indicator(s)
lit?
(front
operator
panel
or
power
supply
LED).
NO
Go
to
“Step
1520-10”
on
page
19.
YES
Go
to
“Step
1520-2”
on
page
18.
17
Summary of Contents for THINKPAD T42 -
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