Delta THINKPAD R40 Technical Information Page 24

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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
a
bulging
capacitor
v
Mechanical
hazards,
such
as
loose
or
missing
hardware
To
determine
whether
there
are
any
potentially
unsafe
conditions,
use
the
following
checklist
at
the
beginning
of
every
service
task.
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
type
specified
in
the
parts
list.
c.
Insulation
must
not
be
frayed
or
worn.
4.
Remove
the
cover.
5.
Check
for
any
obvious
non-IBM
alterations.
Use
good
judgment
as
to
the
safety
of
any
non-IBM
alterations.
6.
Check
inside
the
unit
for
any
obvious
unsafe
conditions,
such
as
metal
filings,
contamination,
water
or
other
liquids,
or
signs
of
fire
or
smoke
damage.
7.
Check
for
worn,
frayed,
or
pinched
cables.
8.
Check
that
the
power-supply
cover
fasteners
(screws
or
rivets)
have
not
been
removed
or
tampered
with.
Handling
devices
that
are
sensitive
to
electrostatic
discharge
Any
computer
part
containing
transistors
or
integrated
circuits
(ICs)
should
be
considered
sensitive
to
electrostatic
discharge
(ESD.)
ESD
damage
can
occur
when
there
is
a
difference
in
charge
between
objects.
Protect
against
ESD
Safety
information
20
ThinkPad
R40
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