Operating instructions
SCCt|ON V.
TROUBLE
SHOOTING
AT
ORGANIZATIONAL
MAINTENANCE
LEVEL
O
40.
Scope
a.
The
trouble
shooting
and
repair
r.vork
that
can
be
performecl
at
the
organizational
mainte_
nance
level
is
necessarily
limited
in
scope
by
the
tools,
test
equipmeut,
and
replaceable
parts
issued,
ancl
by
the
existing
tactical
situation.
Accordingly,
trouble
shooting
is
based
on
the
performance
of the
equipment
and
the
use
of
the
senses
in
determining
such
troubles
as
burned-out
tubes,
damaged
insulators,
etc.
ó.
The
paragraphs
which
follow
in
this
sec-
tion
help in
determining
which
of
the
compo_
nents
is
at fault
and
in
localizing
the
fault
in
that component
to
the
defective
item,
such
as
a
tube
or fuse.
41.
VÍsuol
Inspection
o.
Failure
of this
equipment
to operate
prop_
erly will
usually
be caused
by
one
or more
of
the
follou'ins
faults:
(
1)
Improperly
connecterl
or
brokerr
rlower
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(e)
(10)
corcls
or
pìugs.
Improperll'
connected
headphones.
Burned-out
fuses.
Defective
tubes.
Relay
contacts
burned
or
pitted
be-
cause
of
overloads.
Inactive
(dirty
or cracked)
crystal.
Defective
sr,vitches.
Defective
vibrators.
Defective gear
or tuning
mechanism.
Dirty
or
bent
plates
of
variable
capac-
itor.
ó.
When failnre
is
encoutrterecl
ancl
the
cause
is
not
immediately
apparent,
check
as many
of
the
above
iterns
as is
practicable
before
srarr-
ing
a detailed
examination
of
the
radio
set.
If
possible,
obtain
information
from
the
operator
of
the equipment
regarding
perfor.mance
at the
iime
trouble
occurred.
.{GO
3134
c.
Visuallv
inspect
the
antenna
for
obvious
abnormalities.
42.
Trouble
Shooting
by
Using
Equip-
ment
Performonce
Checklist
a.
General.
The
equipment perfolntance
checklist (par.
43)
r,vill
help
the
oper.ator
to
locate
trouble
in
the
equipment.
The
list
gives
the
item
to
be
checked,
the
conclition-q
unrler
which
the
item
is
checkecì,
the normal
inclic:r-
tions
and
tolerances
of
correct
operation,
ancl
the
corrective
measures
the
operator
can
take.
To
use
this
líst,
f
ollotu
tlte
items
in
nutnerícal
Sequence,
b.
Actiotz
ot.
Condition.
For
some
items,
the
information given
in
the
action
or
conclition
column
consists
of
specific
control
settings
with
which
the
item
is
to
be
checked.
For
other
items,
it
represents
an
action
that
must
be
taken
to
check
the
normal
indication
given
in
the
normal
indications
column.
c. l,trorntal
Inclícatíons.
The
normal
inclica-
tions
listed
include
the
visible
and
auclible
signs
that
the
operator
should perceive
rvhen
he
checks
the items.
If
the inclications
are
not
normal,
the
operator
shor"rld
apply
the
recom_
mencled
corrective
measures.
cl.
Correctire
XIt,astu.es.
The
corrective
meas-
ures listed
are those
that
the
operator
can
make
without
turning
in
the
eqr:ipment
for
repairs.
A reference
in
the
table
to
chapter
b
indicates
that
the
trouble
cannot
be correctecl
during
operation
and
that
trouble
shooting
b1,
an
ex_
perienced
repairman
is
necessarl,.
If
ilre
re-
ceiver
is
completely
inoperatil'e
or
if
the r.ectim-
mended
corrective
measrtres
rlo
not lielrl
re-
sults,
trouble
shooting
is
necess:ir'1'.
llriu,er-er,
if
the
tactical
situation
rc,riuiles
thirt
c,tnurLrni-
cation
be maintainerl.
luttl
it'
t he sct
is
not
completely
inoperatir-e.
t1Ìr,
r,pet'it1
r)t'
nìLlst
main-
tain
the set
in
operatirrn
trs lrng
rr,{ it
is
ttossibje
to
do
so.
25