Table of Contents
Advertisement
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.
V. VACUUM
TEST
Refer
to
the
exploded view diagrams and parts lists
in this 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.
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.
Orient the radio
so
that the housing is rightside-up
and the
PTT
button is on the left.
Place several
drops of fresh water
in
the small hole on the right
side
of the
second speaker grille slot
from the
bottom
(opposite
from
the microphone).
This
will
seal
off.the grille.
4.
Attach the open end
of the
hose
to the
adapter.
5.
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
vacuum
port
seal.
NOTE
If
this leak-down phenomenon does
not
occur, the
port
seal is
probably missing, damaged, or wet.
In
this
manual, refer
to the
"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 several more times, the
gauge
should stabilize at 5
in.
Hg.
6.
Observe
the
gauge
for approximately two minutes.
©
If
the needle falls 2
in.
Hg
or
less
(for
example,
from 5 in.
Hg
to 3
in.
Hg),
then the radio
has
passed
the vacuum test and is approved for
submersibility.
No
additional testing
will be
required.
©
If
the
needle falls
more than 2 in. Hg
(for
example,
from
5
in.
Hg
to
less
than 3
in.
Hg),
then the radio
has failed
the vacuum test and
the radio might
leak
if
submersed. Additional
troubleshooting
of the radio will be required;
complete this procedure, then go
to
the
"PRESSURE TEST"
section
of this manual.
7.
Remove
the vacuum hose and adapter
from
the
radio.
VI.
PRESSURE TEST
Refer
to
the
exploded view diagrams and parts lists
in this manual.
A. General
Pressure testing
the radio is
necessary
only
if
the
radio has failed the vacuum test. Do not perform the
pressure test
until
the vacuum test
has been completed.
Pressure testing involves creating
a
pressure condition
inside the radio, submersing the radio
in
water, and
observing the
radio for
a
stream
of
bubbles (leak).
Since
all
areas
of the radio are being
checked, observe
the
entire
unit
carefully
for the possibility of multiple
leaks
before completing this test.
B. Conducting the
Test
1.
Screw
the adapter (with
gasket)
into
the tapped hole
in
the baseplate.
2.
Attach one end
of the
pressure hose
to the
adapter
and the other end
to the
pressure
pump.
3.
Operate
the pump until the
gauge reads
approximately
1
psig. Some leak-down is
normal
as
the pressure
equalizes across
the vacuum port seal.
"CAUTION
Pressure any greater
than
1
psig may
push air
around the main
seal and may damage
the
grille
area,
US
OE
ve?LER
ES
8
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.
V. VACUUM
TEST
Refer
to
the
exploded view diagrams and parts lists
in this 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.
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.
Orient the radio
so
that the housing is rightside-up
and the
PTT
button is on the left.
Place several
drops of fresh water
in
the small hole on the right
side
of the
second speaker grille slot
from the
bottom
(opposite
from
the microphone).
This
will
seal
off.the grille.
4.
Attach the open end
of the
hose
to the
adapter.
5.
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
vacuum
port
seal.
NOTE
If
this leak-down phenomenon does
not
occur, the
port
seal is
probably missing, damaged, or wet.
In
this
manual, refer
to the
"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 several more times, the
gauge
should stabilize at 5
in.
Hg.
6.
Observe
the
gauge
for approximately two minutes.
©
If
the needle falls 2
in.
Hg
or
less
(for
example,
from 5 in.
Hg
to 3
in.
Hg),
then the radio
has
passed
the vacuum test and is approved for
submersibility.
No
additional testing
will be
required.
©
If
the
needle falls
more than 2 in. Hg
(for
example,
from
5
in.
Hg
to
less
than 3
in.
Hg),
then the radio
has failed
the vacuum test and
the radio might
leak
if
submersed. Additional
troubleshooting
of the radio will be required;
complete this procedure, then go
to
the
"PRESSURE TEST"
section
of this manual.
7.
Remove
the vacuum hose and adapter
from
the
radio.
VI.
PRESSURE TEST
Refer
to
the
exploded view diagrams and parts lists
in this manual.
A. General
Pressure testing
the radio is
necessary
only
if
the
radio has failed the vacuum test. Do not perform the
pressure test
until
the vacuum test
has been completed.
Pressure testing involves creating
a
pressure condition
inside the radio, submersing the radio
in
water, and
observing the
radio for
a
stream
of
bubbles (leak).
Since
all
areas
of the radio are being
checked, observe
the
entire
unit
carefully
for the possibility of multiple
leaks
before completing this test.
B. Conducting the
Test
1.
Screw
the adapter (with
gasket)
into
the tapped hole
in
the baseplate.
2.
Attach one end
of the
pressure hose
to the
adapter
and the other end
to the
pressure
pump.
3.
Operate
the pump until the
gauge reads
approximately
1
psig. Some leak-down is
normal
as
the pressure
equalizes across
the vacuum port seal.
"CAUTION
Pressure any greater
than
1
psig may
push air
around the main
seal and may damage
the
grille
area,
US
OE
ve?LER
ES
8
Advertisement
Table of Contents
