PS Magazine - TB 43-PS-558
PS, The Preventative Maintenance Monthly
ISSUE 558
MAY 1999
PS 558
51
PS 558
50
MAY 99
and keyways on the connectors. Do
that by making sure the flat surface of
the cable connector is facing up. Newer
fill cables have a raised area with a red
line. That red line should face up also.
Push the cable connector all the way
in on the AUD/FILL connector. Then
turn it clockwise until it snaps into
place. Pull lightly outward on the con-
nector to make sure it’s locked into
place.
Splitter Cable
There aren’t enough receptacles to
hook up all the power cables needed
on both LS-671 loudspeakers when
your vehicular SINCGARS is in the
short range/long range or long range/
long range configuration. For these
configurations, you need the CX-13417
splitter cable, NSN 5995-01-348-2264.
Halfway is not enough when you
unscrew the primary power cable from
the LS-671 loudspeaker on your
SINCGARS vehicular radio. It’s all the
way or nothing.
SINCGARS RT. It makes hookup
easier and also prevents damage to con-
nector pins.
Trying a direct hookup between the
fill device and the RT’s AUD/FILL con-
nector spells double trouble.
For one thing, it’s hard to connect
the fill device to the lower RT in a
vehicle. The thumbscrew on the mount
gets in the way.
For another, you risk bending
or breaking connector pins on the RT
and the fill device with a direct hook
up. Then you won’t be able to load
frequency-hopping data into the RT.
Follow these tips when using the fill
cable:
•
Look at all connectors for damaged
or missing contacts. That includes con-
nectors on the fill cable, the fill device
and the RT itself. Report problems to
your unit repairer.
•
For an easier hookup, put a light
coat of silicone, NSN 6850-00-880-
7616, on the fill cable’s O-rings.
If you can hear sidetone, the likely
culprit is a bad W4 cable, not the hand-
set or the RT.
When you hook up the W4 cable or
the handset, do it right:
Depending on the type of cable con-
nector you have, line up the flat or
raised part of the cable connector with
the top of the receptacle.
With silicone, the connectors will
slide on without a hitch.
Don’t unhook connections by yank-
ing on the cable’s insulation. That just
bends and breaks the delicate inside
wiring.
Additional W4 Stuff
The W4 audio cable on your vehicu-
lar SINCGARS connects the AUD/
DATA connector on the receiver-trans-
mitter to the DATA connector on the
AM-7239 amplifier-adapter.
You must lube the cable’s O-rings
with a dab of silicone, NSN 6850-00-
880-7616. Without lube, it’s tough to
make a good connection. You’ll end
up pushing, twisting and forcing a
connection. That leads to damaged
keyways, stripped threads and bent or
broken pins.
•
When it comes time to connect the
fill cable to the RT, line up the keys
Push in the connector firmly.
Turn it to the right.
Some Fill Cable Stuff
Always use the W4 ECCM fill cable,
NSN 5810-01-066-7587, when you
connect the ECCM fill device to your
Lube cable’s O-rings
Unhook connections by pushing the
connector in and turning it counter-
clockwise. It will easily disconnect.
When you reconnect, make sure the
connection is tight.
If the W4 cable connections are good,
but you still can’t hear sidetone, dis-
connect the W4 cable from the RT.
Then connect the H-250 handset cord
to the AUD/DATA connector on the
RT. Test again for sidetone.
Color
NSN 7510-00-
Black
551-8474
Dark blue
550-7124
Green
550-7129
Red
550-7126
White
550-7127
Yellow
550-7125
Here are some tapes to help identify
connections:
Connect
handset
cord to
RT and
test for
sidetone
W4 cable connected tight?
Dab silicone on O-rings
Line up connector
key and keyway
You need to unscrew the cable’s con-
nector the whole way before trying to
unhook the cable. Some folks stop half-
way. Then they yank and twist the cable
in a vain effort to take it off. That just
puts stress on the circuitry inside the
Unscrew cable all the way
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