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INSTRUCTION
MANUAL
Dlgitrl Multim*trr
Mod.18
172A. 173A
8)
To gain
access
to the
display
board
components
(or
to
remwe
the
display
board),
first,
remove
the
current
board
(173A)
or
the
display
board
RF shield
(172A)
by dis-
connecting
its
connector
to the
main
printed
circuit
board
and removing
the
2 attaching
screws.
b.
Special
Handling
of
Static
Sensitive
Devices.
C/MOS devices
are
designed
to
function
at
very
low voltage
levels
for
low power
consumption.
For
this
reason,
a nor-
mal static
charge
build
up on your
person
or
clothing
can be sufficient
to destroy
these
devices.
The following
steps
list
the
static
sensitive
devices
in your
instrument,
or
its
options,
and provide
instructions
on how to avoid
damaging
them when
they
must
be
remo,/ed/replaced+
I)
Static
sensitive
devices:
Keithley
Part
Number
Reference
Designation
IC-103
~1015,
~1106
IC-108
U803,
UlOl4,
UllO7
IC-135
U502
IC-I36
~1008
thru
UlOll
IC-138
UIOOI
thru
U1007,
UlOl2,
UIOI3,
UllO9
;;I#:
~805,
UIII~
UIIOI
thru
UllO3.
UllO5
LSI-4
uqo I
28090A
U603
2)
The above
integrated
circuits
should
be handled
and
transported
only
in pro-
_
tective
containers.
Typically
they
will
be received
in metal
tubes
or
static
pro-
tective
foam.
Keep the
devices
in
their
original
containers
until
ready
for
use.
3)
Rerove
the
devices
from
their
protective
containers
only
at
a properly
grounded
work
bench
or
table,
and only
after
grounding
yourself
by using
a wrist
strap.
4)
Handle
the
devices
only
by the
body.
Do not
touch
the
pins.
5)
Any printed
circuit
board
into
which
a device
is
tp be inserted
must
also
be
grounded
to
the
bench
or
table.
6)
Use only
anti-static
type
solder
suckers.
7)
Use only
grounded
tip
soldering
irons.
8)
After
soldering
the
device
into
the
board,
or
properly
inserting
it
into
the
mating
receptacle,
the
device
is
adequately'protected
and normal
handling
can be
resumed.
c.
Troubleshootinq
Hints.
Table
6-8
describes
the
Symptoms
and Probable
Cause
for
a
variety
of
possible
malfunctions.
It
is
beyond
the
scope
of
this
Instruction
Manual
to
list
all
possible
symptoms,
therefore,
it
is
suggested
that
you contact
the
Keithley
representative
in your
area,
or
the
Factory,
in
the
event
your
instrument
needs
repair.
6-16
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