Table of Contents
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MAINTENANCE
1.
INTRODUCTION
This
section
of the
manual
describes recommend-
ed repair
procedures, special precautions regarding
maintenance,
and recommended
test equipment.
Each
of
these topics provides
information vital
to
the
successful
operation and maintenance of the
SABER
radio.
2.
PREVENTIVE
MAINTENANCE
The
SABER
radio
does
not
require a
scheduled
preventive maintenance program; however, periodic
visual inspection and cleaning
is
recommended.
a.
Inspection
Check
that the external
surfaces
of the radio
are
clean,
and
all
external controls and switches are func-
tional.
A
detailed inspection
of
the interior electronic
circuitry is
not
needed
or
desired.
b.
Cleaning
The
following procedures describe the recom-
mended cleaning agents and the methods
to be
used
when cleaning the external and internal surfaces
of
the radio. External
surfaces
include the
front
cover,
housing assembly, and battery
case. These surfaces
should be cleaned whenever a periodic visual inspec-
tion
reveals
the
presence
of
smudges, grease,
and/or
grime.
Internal
surfaces should
be
cleaned
only when
the radio
is
disassembled
for
servicing
or repair.
The
only recommended
agent
for
cleaning
the
external radio surfaces
is
a
0.5%
solution
of
a
mild
dishwashing detergent
in
water (one teaspoon
of
detergent per gallon
of
water). Stronger cleaning
agents
may be used only
to
remove soldering flux
from
circuit boards after making repairs.
(1) Cleaning External Surfaces
The detergent-water
solution should be applied
sparingly
with
a
stiff,
non-metallic, short-bristled brush
to
work
all
loose
dirt
away
from the
radio. A soft,
absorbent, lintless cloth
or
tissue should
be used
to
remove the solution and dry the
radio.
Make sure that
no
water remains entrapped near
the
connectors,
cracks,
or
crevices.
(2) Cleaning
Internal Circuit
Boards
and Components
NOTE
Always
use a fresh supply
of alcohol and a
clean
container
to
prevent contamination
by
dissolved
material (from previous
usage).
Isopropyl alcohol may be applied with
a
stiff, non-
metallic, short-bristled brush
to
dislodge embedded
or
caked materials
located
in
hard-to-reach areas.
The
brush stroke should direct the
dislodged material out
and
away
from the
inside
of the radio.
Alcohol
is
a high-wetting
liquid
and can carry con-
tamination
into
unwanted
places
if
an
excessive
quan-
tity is
used. Make sure
that controls or
tunable compo-
nents are
not
soaked
with the liquid.
Do not use high-
pressure
air to hasten the drying
process, since
this
could
cause
the liquid
to
puddle and
collect
in
unwant-
ed
places.
Upon completion
of
the
cleaning process, use a
soft, absorbent, lintless cloth to dry the
area. Do
not
brush
or
apply any isopropyl alcohol
to
the frame,
con-
trol
top, front cover, or
back cover.
3.
DISASSEMBLY
AND
REASSEMBLY
For disassembly and reassembly
of the
radio,
refer
to
the
DISASSEMBLY/REASSEMBLY PROCE-
DURES,
exploded views, and exploded view parts
lists
in
the
applicable service manual.
Several special
tools are required
to
disassemble
the radio completely.
Refer
to
the
"Specialized Tools
and
Test Equipment"
and the "Torque
Specifications"
charts
in
the
applicable service manual.
NOTE
SABER
radio
contains complementary metal-oxide
semiconductor
(CMOS) devices,
which are highly
susceptible
to
damage
in
handling due
to
static dis-
charge.
The
entire printed circuit board should be
treated
as static sensitive. Damage can
be latent,
resulting
in
failures occurring weeks
or
months
later.
DO
NOT
attempt to
disassemble
the radio without
first referring
to
the
"Safe Handling
of
CMOS
Devices" paragraph
in
this section
of
the manual.
4.
SAFE
HANDLING
OF CMOS DEVICES
Complementary metal-oxide semiconductor
(CMOS) devices
are used
in
the
SABER
radio.
While
the attributes of
CMOS
are many, their characteristics
make them susceptible
to
damage
by
electrostatic
or
high
voltage charges. Damage can
be latent, resulting
in
failures occurring
weeks
or
months
later.
Therefore,
special precautions
must be taken
to
prevent
device
damage
during
disassembly, troubleshooting,
and
repair.
The
following handling precautions are manda-
tory for
CMOS
circuits, and are especially important
in
low humidity conditions.
CAUTION
The
effects of certain chemicals and their vapors
can have
harmful
results
on
certain plastics.
Aerosol sprays,
tuner
cleaners and
other chemi-
cals
should be avoided.
Never
allow any aicohol- or solvent-based prod-
uct
te contact any plastic
or rubber radio part.
a. All
CMOS devices
must be stored or transported
in
conductive material so
that all
exposed leads are
shorted together.
CMOS devices
must not be
inserted
into
conventional plastic "snow"
or
plastic
trays
of the
type that are used
for
storage
or
trans-
portation of other
semiconductor devices.
17
MAINTENANCE
1.
INTRODUCTION
This
section
of the
manual
describes recommend-
ed repair
procedures, special precautions regarding
maintenance,
and recommended
test equipment.
Each
of
these topics provides
information vital
to
the
successful
operation and maintenance of the
SABER
radio.
2.
PREVENTIVE
MAINTENANCE
The
SABER
radio
does
not
require a
scheduled
preventive maintenance program; however, periodic
visual inspection and cleaning
is
recommended.
a.
Inspection
Check
that the external
surfaces
of the radio
are
clean,
and
all
external controls and switches are func-
tional.
A
detailed inspection
of
the interior electronic
circuitry is
not
needed
or
desired.
b.
Cleaning
The
following procedures describe the recom-
mended cleaning agents and the methods
to be
used
when cleaning the external and internal surfaces
of
the radio. External
surfaces
include the
front
cover,
housing assembly, and battery
case. These surfaces
should be cleaned whenever a periodic visual inspec-
tion
reveals
the
presence
of
smudges, grease,
and/or
grime.
Internal
surfaces should
be
cleaned
only when
the radio
is
disassembled
for
servicing
or repair.
The
only recommended
agent
for
cleaning
the
external radio surfaces
is
a
0.5%
solution
of
a
mild
dishwashing detergent
in
water (one teaspoon
of
detergent per gallon
of
water). Stronger cleaning
agents
may be used only
to
remove soldering flux
from
circuit boards after making repairs.
(1) Cleaning External Surfaces
The detergent-water
solution should be applied
sparingly
with
a
stiff,
non-metallic, short-bristled brush
to
work
all
loose
dirt
away
from the
radio. A soft,
absorbent, lintless cloth
or
tissue should
be used
to
remove the solution and dry the
radio.
Make sure that
no
water remains entrapped near
the
connectors,
cracks,
or
crevices.
(2) Cleaning
Internal Circuit
Boards
and Components
NOTE
Always
use a fresh supply
of alcohol and a
clean
container
to
prevent contamination
by
dissolved
material (from previous
usage).
Isopropyl alcohol may be applied with
a
stiff, non-
metallic, short-bristled brush
to
dislodge embedded
or
caked materials
located
in
hard-to-reach areas.
The
brush stroke should direct the
dislodged material out
and
away
from the
inside
of the radio.
Alcohol
is
a high-wetting
liquid
and can carry con-
tamination
into
unwanted
places
if
an
excessive
quan-
tity is
used. Make sure
that controls or
tunable compo-
nents are
not
soaked
with the liquid.
Do not use high-
pressure
air to hasten the drying
process, since
this
could
cause
the liquid
to
puddle and
collect
in
unwant-
ed
places.
Upon completion
of
the
cleaning process, use a
soft, absorbent, lintless cloth to dry the
area. Do
not
brush
or
apply any isopropyl alcohol
to
the frame,
con-
trol
top, front cover, or
back cover.
3.
DISASSEMBLY
AND
REASSEMBLY
For disassembly and reassembly
of the
radio,
refer
to
the
DISASSEMBLY/REASSEMBLY PROCE-
DURES,
exploded views, and exploded view parts
lists
in
the
applicable service manual.
Several special
tools are required
to
disassemble
the radio completely.
Refer
to
the
"Specialized Tools
and
Test Equipment"
and the "Torque
Specifications"
charts
in
the
applicable service manual.
NOTE
SABER
radio
contains complementary metal-oxide
semiconductor
(CMOS) devices,
which are highly
susceptible
to
damage
in
handling due
to
static dis-
charge.
The
entire printed circuit board should be
treated
as static sensitive. Damage can
be latent,
resulting
in
failures occurring weeks
or
months
later.
DO
NOT
attempt to
disassemble
the radio without
first referring
to
the
"Safe Handling
of
CMOS
Devices" paragraph
in
this section
of
the manual.
4.
SAFE
HANDLING
OF CMOS DEVICES
Complementary metal-oxide semiconductor
(CMOS) devices
are used
in
the
SABER
radio.
While
the attributes of
CMOS
are many, their characteristics
make them susceptible
to
damage
by
electrostatic
or
high
voltage charges. Damage can
be latent, resulting
in
failures occurring
weeks
or
months
later.
Therefore,
special precautions
must be taken
to
prevent
device
damage
during
disassembly, troubleshooting,
and
repair.
The
following handling precautions are manda-
tory for
CMOS
circuits, and are especially important
in
low humidity conditions.
CAUTION
The
effects of certain chemicals and their vapors
can have
harmful
results
on
certain plastics.
Aerosol sprays,
tuner
cleaners and
other chemi-
cals
should be avoided.
Never
allow any aicohol- or solvent-based prod-
uct
te contact any plastic
or rubber radio part.
a. All
CMOS devices
must be stored or transported
in
conductive material so
that all
exposed leads are
shorted together.
CMOS devices
must not be
inserted
into
conventional plastic "snow"
or
plastic
trays
of the
type that are used
for
storage
or
trans-
portation of other
semiconductor devices.
17
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