Motorola SABER Handie-Talkie Краткое руководство по эксплуатации - Страница 3

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Motorola SABER Handie-Talkie Краткое руководство по эксплуатации
4.
DISASSEMBLY
AND
REASSEMBLY
If
disassembly and reassembly of
the radio
is
required,
refer
to
the
"DISASSEMBLY/
REASSEMBLY PROCEDURES"
in the
applicable
service
manual.
a.
Disassembly
Disassemble
the radio
according
to
the
"DISASSEMBLY"
section
of the
applicable service
manual; refer also
to
the
"SERVICING MAJOR
SUBASSEMBLIES"
section.
b.
Reassembly
Reassemble
the radio
according
to
the
"REASSEMBLY"
section
of the
applicable
service
manual; refer also
to
the
"SERVICING
MAJOR SUBASSEMBLIES"
section. Tighten
all
hardware which
was loosened
or
removed per the
Torque
Specifications
table. DO
NOT
RE-
ASSEMBLE
THE RADIO WITHOUT
FIRST
PERFORMINGTHE FOLLOWING PRELIMINARY
INSPECTION
PROCEDURE:
(1)
Remove
the main
seal O-ring
from
the control
top panel.
(2) Inspect the
seal area
around the control top
panel
for foreign material that might
prevent
the main
seal O-ring
from
sealing
properly.
(3)
Instail
Cca
new main
seal O-ring; discard
the old
O-ring.
(4)
Check
to
ensure that
both frame stud
seals
are
in
place and are
not
damaged
in
any way.
Replace
both
frame stud
seals
if
any damage
or
foreign material is visible.
NOTE
When seating
the main seal O-ring
in
the radio
housing, use hand pressure
to
press
the radio
into
the housing. Make sure that the
baseplate
slotted-spanner
nuts are properly
aligned
before tightening them.
5.
VACUUM
TEST
Refer
to
the
exploded view diagrams and
parts lists
in
the
applicable service manual.
a.
General
The vacuum test uses
a vacuum pump and
gauge. The
pump
creates
a vacuum condition
inside the radio, and the
gauge
monitors the radio
for
a
stable vacuum reading;
that is,
checking
for
a
properly
sealed,
watertight
unit.
Before starting
the vacuum test:
*
Remove
the battery and
check
the battery
contact
mounting
screws
for
correct torque.
*
Check
the two baseplate slotted-spanner nuts
for correct torque.
¢
Check
the
antenna bushing spanner
nut for
correct torque.
*
Remove
the universal
connector cover
to
expose
the universal connector.
¢
If
the radio has a belt clip (NTN4741 only),
check
the
revision letter stamped
on
the
underside
of
the metal bracket.
Revision
"O"
belt
clips may cause leakage and should
be
replaced
with a later
version belt clip. Alf
radios
with
belt clips should be vacuum tested
with the
belt clip attached since
the
belt clip
can affect
the
radios leak
rate.
b.
Conducting
the Test
(1) Attach the vacuum hose
to
the vacuum pump.
Check
the pump and
hose
for
leaks
by
blocking
off
the open end
of
the hose and
operating the pump a few times.
The
actual
reading
of
the
gauge
at
this point
is not
important;
it
is important that the
gauge
pointer remains steady, indicating no
vacuum
leaks
in
the pump.
(2) Ensure that a rubber
gasket
is
attached
to
the
hose-to-baseplate
adapter.
Screw
the adapter
into
the tapped hole
in
the
baseplate.
(3)
Attach
the open end
of
the hose
to
the
adapter.
(4) Operate the pump
a
few times
until
the
gauge
indicates
5
in.
Hg; do not pull more than
10
in.
Hg of
vacuum on
the radio.
The gauge
should
indicate
a
leaking-down and should stabilize at
some lower value. The leak-down
is normal
and important;
it
indicates that the pressure
is
equalizing across the
port
seal membrane.
CAUTION
Fhe
main
seal O-ring should
not
be
visible
when.
looking at the top
side of
the radio. if
theseal
is visible,
it
is
improperly installed.
NOTE
If
this leak-down phenomenon
does
not
occur,
the
port
seal
is probably missing,
damaged,
or
wet.
In
this manual, refer
to
the
"Baseplate
Elastomer Seal
or
Vacuum Port
Seal"
paragraph
of the
"PRESSURE TEST"
section.
Operate
the pump
again
until
the
gauge
indicates
5
in.
Hg. Some additional leak-down
will
occur. After repeating this action two
or
three more times, the
gauge
should stabilize
at
5
in.
Hg.
4.
DISASSEMBLY
AND
REASSEMBLY
If
disassembly and reassembly of
the radio
is
required,
refer
to
the
"DISASSEMBLY/
REASSEMBLY PROCEDURES"
in the
applicable
service
manual.
a.
Disassembly
Disassemble
the radio
according
to
the
"DISASSEMBLY"
section
of the
applicable service
manual; refer also
to
the
"SERVICING MAJOR
SUBASSEMBLIES"
section.
b.
Reassembly
Reassemble
the radio
according
to
the
"REASSEMBLY"
section
of the
applicable
service
manual; refer also
to
the
"SERVICING
MAJOR SUBASSEMBLIES"
section. Tighten
all
hardware which
was loosened
or
removed per the
Torque
Specifications
table. DO
NOT
RE-
ASSEMBLE
THE RADIO WITHOUT
FIRST
PERFORMINGTHE FOLLOWING PRELIMINARY
INSPECTION
PROCEDURE:
(1)
Remove
the main
seal O-ring
from
the control
top panel.
(2) Inspect the
seal area
around the control top
panel
for foreign material that might
prevent
the main
seal O-ring
from
sealing
properly.
(3)
Instail
Cca
new main
seal O-ring; discard
the old
O-ring.
(4)
Check
to
ensure that
both frame stud
seals
are
in
place and are
not
damaged
in
any way.
Replace
both
frame stud
seals
if
any damage
or
foreign material is visible.
NOTE
When seating
the main seal O-ring
in
the radio
housing, use hand pressure
to
press
the radio
into
the housing. Make sure that the
baseplate
slotted-spanner
nuts are properly
aligned
before tightening them.
5.
VACUUM
TEST
Refer
to
the
exploded view diagrams and
parts lists
in
the
applicable service manual.
a.
General
The vacuum test uses
a vacuum pump and
gauge. The
pump
creates
a vacuum condition
inside the radio, and the
gauge
monitors the radio
for
a
stable vacuum reading;
that is,
checking
for
a
properly
sealed,
watertight
unit.
Before starting
the vacuum test:
*
Remove
the battery and
check
the battery
contact
mounting
screws
for
correct torque.
*
Check
the two baseplate slotted-spanner nuts
for correct torque.
¢
Check
the
antenna bushing spanner
nut for
correct torque.
*
Remove
the universal
connector cover
to
expose
the universal connector.
¢
If
the radio has a belt clip (NTN4741 only),
check
the
revision letter stamped
on
the
underside
of
the metal bracket.
Revision
"O"
belt
clips may cause leakage and should
be
replaced
with a later
version belt clip. Alf
radios
with
belt clips should be vacuum tested
with the
belt clip attached since
the
belt clip
can affect
the
radios leak
rate.
b.
Conducting
the Test
(1) Attach the vacuum hose
to
the vacuum pump.
Check
the pump and
hose
for
leaks
by
blocking
off
the open end
of
the hose and
operating the pump a few times.
The
actual
reading
of
the
gauge
at
this point
is not
important;
it
is important that the
gauge
pointer remains steady, indicating no
vacuum
leaks
in
the pump.
(2) Ensure that a rubber
gasket
is
attached
to
the
hose-to-baseplate
adapter.
Screw
the adapter
into
the tapped hole
in
the
baseplate.
(3)
Attach
the open end
of
the hose
to
the
adapter.
(4) Operate the pump
a
few times
until
the
gauge
indicates
5
in.
Hg; do not pull more than
10
in.
Hg of
vacuum on
the radio.
The gauge
should
indicate
a
leaking-down and should stabilize at
some lower value. The leak-down
is normal
and important;
it
indicates that the pressure
is
equalizing across the
port
seal membrane.
CAUTION
Fhe
main
seal O-ring should
not
be
visible
when.
looking at the top
side of
the radio. if
theseal
is visible,
it
is
improperly installed.
NOTE
If
this leak-down phenomenon
does
not
occur,
the
port
seal
is probably missing,
damaged,
or
wet.
In
this manual, refer
to
the
"Baseplate
Elastomer Seal
or
Vacuum Port
Seal"
paragraph
of the
"PRESSURE TEST"
section.
Operate
the pump
again
until
the
gauge
indicates
5
in.
Hg. Some additional leak-down
will
occur. After repeating this action two
or
three more times, the
gauge
should stabilize
at
5
in.
Hg.