–
Stand
on
suitable
rubber
mats
(obtained
locally,
if
necessary)
to
insulate
you
from
grounds
such
as
metal
floor
strips
and
machine
frames.
Observe
the
special
safety
precautions
when
you
work
with
very
high
voltages;
these
instructions
are
in
the
safety
sections
of
maintenance
information.
Use
extreme
care
when
measuring
high
voltages.
v
Regularly
inspect
and
maintain
your
electrical
hand
tools
for
safe
operational
condition.
v
Do
not
use
worn
or
broken
tools
and
testers.
v
Never
assume
that
power
has
been
disconnected
from
a
circuit.
First,
check
that
it
has
been
powered-off.
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
and
can
cause
personal
injury
and
machine
damage.
v
Do
not
service
the
following
parts
(or
similar
units)
with
the
power
on
when
they
are
removed
from
their
normal
operating
places
in
a
machine.
This
practice
ensures
correct
grounding
of
the
units.
–
Power
supply
units
–
Pumps
–
Blowers
and
fans
–
Motor
generators
v
If
an
electrical
accident
occurs:
–
Use
caution;
do
not
become
a
victim
yourself.
–
Switch
off
power.
–
Send
another
person
to
get
medical
aid.
Handling
ESD-sensitive
devices
Any
computer
part
that
contains
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
that
is
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
that
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.
xii
IBM
TotalStorage
DS4000:
Hardware
Maintenance
Manual
Summary of Contents for System Storage DS4000
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