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WARNING:
STATIC-SENSITIVE
PARTS - HANDLE
APPROPRIATELY.
SECTION 4.
SYSTEM CHECKOUT AND TROUBLESHOOTING
4.1 INTRODUCTION
This
section
provides
a
procedure
for
system
check-
out and
troubleshooting
to
help
isolate
system fail
-
ures.
Table
4-1 lists the
necessary test equipment
or
its
equivalent.
Table 4-1.
Test
Equipment for
Checkout and
Troubleshooting
Equipment
Part
No.
or Value
*RF
Signal
Generator
Fluke6060B
•RF
Power
Meter
Motorola S-1339A
•
SIN
AD
Meter
Motorola R -1013A
•
Modulation Meter
HP8901
RF Power
Source
I
watt
to
100 watts
•
An
R2001
is suitable
for use in place
of
tbese
separate
equipment&.
4.2
SAFE
HANDLING OF
CMOS
INTEGRA
TED-
CIRCUIT
DEVICES
Many of
t he
integrated-circuit devices
used in com-
munications
equipment
are
CMOS
(complementary
metal
-oxide semiconductor) ICs.
Because
of
their
high
open-circui
t
impedance, CMOS
ICs
are vulnerable to
damage from static
charges.
Take care
in
handling,
shipping,
and
servicing
these
ICs
and the assemblies
in
which
they
are
used.
Even
though
protection devices are
provided in
CMOS IC
inputs,
the protection
is
effective
only
against overvoltage
in
the
range
of
hundreds
of
volts,
such
as that encountered
in
an operating
system.
In
a
system,
circuit elements
distribute static
charges and
load
the CMOS
circui
ts,
decreasing the
chance of
damage.
Howc>uer,
CMOS
circuits
can
be damaged
by improper handling of the modules even in
a sys-
tem.
To
avoid
damaging
circuits,
observe
the
following
handling, shipping, and servicing
precautions.
1.
Before
a
nd while servicing
a circuit
module,
par-
ticularly
after
moving
within
the service area,
momentarily
touch
both hands
to
a
bare
metal,
earth-grounded
surface.
This
will
discharge any
static
charge which
may have
accumulated
on you.
NOTE
Wearing
a
"
Conductive
Wris
t
Strap"
(Motorola No.
RSX -4015A)
will minimize
static
buildup
during
servicing.
4-1
WARNING
When wearing a
"Conductive
Wrist
Strap,"
be
careful
near
high
-volt-
age
sources.
The
"good
ground"
provided by
the wrist
strap
also
increases the danger
of
lethal
shock
from accidentally touching
high-
voltage
sources.
2.
Whenever
possible,
avoid touching any electri-
cally conductive
parts
of
the
circuit
module with
your
hands.
3.
Circuit
modules
should
not be
inserted or removed
with
power
applied to the
unit.
4.
When servicing
a circuit
module,
avoid
carpeted
areas,
dry
environments, and certain types of
clothing
(silk,
nylon,
etc.)
because they contribute
to
static
buildup.
5.
All
electrically powered
test
equipment
should
be
grou nded.
Apply
t
he
grou
nd
lead
from
the test
equipment to the circuit module
before
connect-
ing
the
test
probe.
Similarly,
disconnect the
tes
t probe
before
removing
the
ground
lead
.
6.
If
you
remove
a
circuit
module from the
system,
lay
it
on a conductive
surface (such
as
a
sheet
of
aluminum
foil)
which
is
connected to ground
through lOOk
of
resistance.
WARNING
If
the
aluminum
foil
is
connected
directly
to
ground,
be careful
of
possible electrical
shock:
d
on'
t
touch
both
the foil and
other
elec-
trical
circuits
at
the same
time.
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Table of Contents
Troubleshooting
