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Handling
electrostatic
discharge-sensitive
devices
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
damage
by
equalizing
the
charge
so
that
the
machine,
the
part,
the
work
mat,
and
the
person
handling
the
part
are
all
at
the
same
charge.
Notes:
1.
Use
product-specific
ESD
procedures
when
they
exceed
the
requirements
noted
here.
2.
Make
sure
that
the
ESD
protective
devices
you
use
have
been
certified
(ISO
9000)
as
fully
effective.
Use
the
following
precautions
when
handling
ESD-sensitive
parts.
v
Keep
the
parts
in
protective
packages
until
they
are
inserted
into
the
product.
v
Avoid
contact
with
other
people.
v
Wear
a
grounded
wrist
strap
against
your
skin
to
eliminate
static
on
your
body.
v
Prevent
the
part
from
touching
your
clothing.
Most
clothing
is
insulative
and
retains
a
charge
even
when
you
are
wearing
a
wrist
strap.
v
Select
a
grounding
system,
such
as
those
listed
below,
to
provide
protection
that
meets
the
specific
service
requirement.
Note:
The
use
of
a
grounding
system
is
desirable
but
not
required
to
protect
against
ESD
damage.
–
Attach
the
ESD
ground
clip
to
any
frame
ground,
ground
braid,
or
green-wire
ground.
–
Use
an
ESD
common
ground
or
reference
point
when
working
on
a
double-insulated
or
battery-operated
system.
You
can
use
coax
or
connector-outside
shells
on
these
systems.
–
Use
the
round
ground-prong
of
the
ac
plug
on
ac-operated
computers.
v
Use
the
black
side
of
a
grounded
work
mat
to
provide
a
static-free
work
surface.
The
mat
is
especially
useful
when
handling
ESD-sensitive
devices.
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
non-IBM
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
following
checks
with
the
power
off,
and
the
power
cord
disconnected.
1.
Check
exterior
covers
for
damage
(loose,
broken,
or
sharp
edges).
2.
Power-off
the
computer.
Disconnect
the
power
cord.
104
Hardware
Maintenance
Manual