Hitachi RAS-5142CH - Page 3

PREVENTION OF DAMAGE TO SEMICONDUCTORS
1.
When
carrying
and
handling
semiconductors
adopted
in
your
Model
during
maintenanace
and
inspection
thereof,
much
care
should
be
taken
to
prevent
the
semiconductors
from
being
damaged.
Also,
such
care
should
be
taken
when
handling
any
faulty
Model
which is
to
be
returned
to factory.
2. The semiconductors used in your Model are the following :
(1) Micro computer
(2) integrated circuits (IC)
(3) Field-effect transistors (FET)
(4)
Printed
circuit
boards
(PC
boards)
or
the
like
on
which
the
parts
in
(1)
and
(2)
above
are
provided
3. Cautions in handling
(1) Use a conductive container to carry or store the semiconductive parts. Even if they are faulty ones, also
handle them using such container.
(2)
When
parts
as
uncovered
are
handled
(for
counting,
packing
or
for
the
like
purpose),
the
hadler
must
use
his
own
body
as
conductor
for
earthing.
For
this
purpose,
put
on
an
electrically
conductive
ring
or
bracelet
at
the
wrist.
Connect
to
the
bracelet
a
conductor
provided
with
a
resistor
of
1
MQ
and
at
the
other
end
with
a
clip
for
connection
to
the
earth
wire.
Conductive polyvinyl bag
\ «—— Conductive sponge
Fig. 1 Conductive Container
(3)
Be
careful
not
to
have
your
clothes
be
in
contact
with
any
part
while
you
are
holding
it,
even
if
the
body
earthing
is
established.
(4) Be sure to place the parts on a grounded metallic plate.
(5)
Never
fail
to
disconnect
the
power
supply
before
starting
repair
of
any
PC
board.
Then,
proceed
to
the
repair
of
the
PC
board
on
the grounded
metallic
plate.
Bracelet for body earthing
({Elimik conductive band)
vA Clip for connection to each wire
1MQ
Fig. 2 Body Earthing