Standard Parts; Special Parts; Transistors And Integrated Circuits; Static -Sensitive Components - Fluke 93 Service Manual

7-40
CORRECTIVE MAINTENANCE
7.2
REPLACEMENTS
7.2.1
Standard
parts
Electrical
and mechanical
parts replacements can be obtained through your
local
FLUKE/PH
ID
PS
organization or represenla^ve. However,
many
generic electronic
components
can be obtained from
other sources. Before purchasing orordering replacement
parts,
check
the parts
Ms! for value,
tolerance, rating,
and
description.
NOTE:
Physica/
$/ze
and
shape
of
a
component may
af^
/nstrument performance,
particu/ajiy at
h/gh frequencies.
A/ways use
d/recf^rep/acemenf
components,
un/ess
it
is
known
that
a
substitute
wilt
not degrade
the instrument's performance.
7.2.2
Special parts
In
addition to
the standard
electronic
components,
some
special
components
are used;
•
Compon
ents
,
custom
manufactured
or
selected
by FLU
K
E/P
H
I
LI
PS
to
meet
specific
pe rformance
requirements.
Components
that
are important
for
the safety
of
personnel.
NOTE:
Both type of
components may
oniy
be
replaced
by components
obtained through
your
iocai
FLUKE/PHIUPS
organization or representative.
7.2.3
Transistors
and
integrated circuits
Some
notes on
handling
these components:
•
Do
not
replace or
swap
semiconductor devices
unnecessarily,
because
the
change
may
affect the
calibration of
the instrument.
-
When
a device
has been
replaced
,
check
the
circuit
that
may
be
affected
for
proper operation
.
See
also the
Performance
Verification
Procedure
in
chapters
7.2.4
Static*
sensitive
components
In
tie
ScopeMeier
the black/yellow
''static-sensitive
components" symbol
is
present (see also
figure
7.4).
This
means
that
^is
instrument contains
electrical
components
that
can be
damaged
by
electrostatical
discharge. Although
all
MOS
Integrated
circuits
incorporate protection
against
electrostatic
discharge, they nevertheless
can be
damaged
by
accidental overvoltages.
Figure
7.
9
Sta
tic-sensitive
symbol
(black/yelio
w)