Safety inspection guide, Safety, Inspection – Lenovo THINKCENTRE 8177 User Manual
Page 13: Guide
v
Always
look
carefully
for
possible
hazards
in
your
work
area.
Examples
of
these
hazards
are
moist
floors,
nongrounded
power
extension
cables,
power
surges,
and
missing
safety
grounds.
v
Do
not
touch
live
electrical
circuits
with
the
reflective
surface
of
a
plastic
dental
mirror.
The
surface
is
conductive;
such
touching
can
cause
personal
injury
and
machine
damage.
v
Do
not
service
the
following
parts
with
the
power
on
when
they
are
removed
from
their
normal
operating
places
in
a
machine:
–
Power
supply
units
–
Pumps
–
Blowers
and
fans
–
Motor
generators
and
similar
units.
(This
practice
ensures
correct
grounding
of
the
units.)
v
If
an
electrical
accident
occurs:
–
Use
caution;
do
not
become
a
victim
yourself.
–
Switch
off
power.
–
Send
another
person
to
get
medical
aid.
Safety
inspection
guide
The
intent
of
this
inspection
guide
is
to
assist
you
in
identifying
potentially
unsafe
conditions
on
these
products.
Each
machine,
as
it
was
designed
and
built,
had
required
safety
items
installed
to
protect
users
and
service
personnel
from
injury.
This
guide
addresses
only
those
items.
However,
good
judgment
should
be
used
to
identify
potential
safety
hazards
due
to
attachment
of
features
or
options
not
covered
by
this
inspection
guide.
If
any
unsafe
conditions
are
present,
you
must
determine
how
serious
the
apparent
hazard
could
be
and
whether
you
can
continue
without
first
correcting
the
problem.
Consider
these
conditions
and
the
safety
hazards
they
present:
v
Electrical
hazards,
especially
primary
power
(primary
voltage
on
the
frame
can
cause
serious
or
fatal
electrical
shock).
v
Explosive
hazards,
such
as
a
damaged
CRT
face
or
bulging
capacitor
v
Mechanical
hazards,
such
as
loose
or
missing
hardware
The
guide
consists
of
a
series
of
steps
presented
in
a
checklist.
Begin
the
checks
with
the
power
off,
and
the
power
cord
disconnected.
Checklist:
1.
Check
exterior
covers
for
damage
(loose,
broken,
or
sharp
edges).
2.
Power-off
the
computer.
Disconnect
the
power
cord.
3.
Check
the
power
cord
for:
a.
A
third-wire
ground
connector
in
good
condition.
Use
a
meter
to
measure
third-wire
ground
continuity
for
0.1
ohm
or
less
between
the
external
ground
pin
and
frame
ground.
b.
The
power
cord
should
be
the
appropriate
type
as
specified
in
the
parts
listings.
c.
Insulation
must
not
be
frayed
or
worn.
4.
Remove
the
cover.
Chapter
2.
Safety
information
7