Operating instructions

\\-hen a tube
is to be
inserted into the
receiver,
either
after
maintenance
or
for replacement
purposes,
the
tube
first should be
inserted into
the
pin
straightener
to aline
the
pins properly.
f
.
Locking
Key Assembly.
The locking key
assembly,
located on the
front
panel
of
the re-
Section
ll. PREVENTIVE
32.
Definition of
Preventive
Mointenonce
Preventive
maintenance
is work
performed
on equipment
(usually
when
the equipment
is
not
in
use)
to
keep it
in
good
rvorking order
so that
breakdowns
and
needless
interruptions
in service
will be
kept to
a minimum.
Preven-
tive
maintenance
differs
from trouble
shooting
and
repair,
since
its object
is to
prevent
cer-
tain troubles
from occurring.
Refer to
AR-
750-5.
33.
Generol
Preventive
Mointensnce
Techniques
o.
Use
No.
0000 sandpaper
to remove
cor-
rosion.
ó.
Use
a
clean,
dry, lint-free
cloth
or a
dry
brush
for cleaning.
(1)
If
necessary, except
for electrical
con-
tacts,
moisten
the cloth
or brush
with
solvent
(SD)
;
then
wipe the
parts
dry
with
a
cloth.
(2)
Clean
electrical
contacts
with
a cioth
moistened
with
carbon
tetrachloride;
then
wipe
them
drY
with a drY
cloth.
Cautíon:
RePeated
contact
of
car-
bon
tetrachloride
with
the skin
or
pro-
longed
breathing
of
fumes
is danger-
ous.
Make sure
adequate
ventilation
is
provided.
c. If available,
dry
compressed
air
may be
used
at a
line
pressure not exceeding
60
pounds
per
square
inch
to
remove
dust
from
inaccessible
places;
be careful,
however,
or
mechanical
dam-
age
from
the
air
blast
maY result.
d. For
further
information
on
preventive
maintenance
techniques,
refer to
TB SIG
178.
34.
Use
of
Preventive
Mointenonce
Forms
a. The
information
in
paragraph
35
is
pre-
sented as a
guide
to
the
individual
making an
22
ceiyer,
is used to
lock
the
preset
channel
de-
tents.
It also mav
be used to turn
the
OUTPUT
and
POWER SELECTOR
srvitches,
and to
re-
move the
scre\\'
ri'hich
holds
the spare
fuses
in
place.
MAI NTENANCE
SERVICES
inspection of
equipment
in
accorcìance
rvith in-
structions
on
DA AGO
Forms 11-238 and
11-
239.
The
decision
as to
which
items on the
form
are applicable
to this
equipment
is
a
tactical
decision
to be
made
in the case
of first echelon
maintenance
by the
commttnications
offìcer,/
chief or
his designated
representative,
ancl
in
the case
of second and
third
echelon
mainte-
nance,
by the
individual
making this
inspection.
Instructions
for the
use of each
form appear
on the
reverse side
of the
form.
b. The
first two
columns
in the
chart
in
para-
graph
35 serve
as a
cross
reference
betrveen
the
item
numbers
of
DA
AGO
Forms
11-238
and
11-239 and the
preventive
maintenance
information
in this
manual.
35.
Performing
Preventive
Mointenonce
The following
preventive maintenance
opera-
tions
should be
pelformecl
b1'
organizational
personnel
at the
intervals
inclicated,
unless
these
intervals
are
reduced
by
the
ìocal commander.
Caution:
Do
not tighten
screws, bolts,
and
nuts carelessly.
Fittings
tightened
beyond
nor-
mal
pressures
for
r,vhich
they
are designed
will
be
damaged
or
broken.
Preventive
maintenance
operations
DAILY
Check
for completeness
and
general
condition
of
equiPment,
The com-
ponents are
listed
in
ParagraPh
7
and
illustrated
in
figure
4.
Check
suitability
of
location
and
in-
stallation
f or
not'r.ua1
operation.
Clean
dirt
and
nroistule
from antenna,
headsets,
connectoi''q,
jacks,
plugs,
carrf
ing
bags, and
component
Pan-
els.
DA
AGO
DA
ACO
Form
Form
11-238
11-239
item
No.
I
item No.
ACO
3134