PS Magazine - TB 43-PS-595
PS, The Preventative Maintenance Monthly
ISSUE 595
JUNE 2002
Don’t use the air hose
unless you have an air gun,
NSN 4940-00-333-5541, to
attach to it.
The air gun limits
the outlet pressure to 30 psi, a
safe level that won’t damage
the filter or injure you.
If you don’t have an air
hose and air gun, tap the filter
and shake the dust out. If your
mission permits, wash the fil-
ter in warm water and a mild
detergent, NSN 7930-00-929-
1221. Let it air dry for a few
hours before reinstalling it.
Dust also collects on the
recessed area and the metal
screen where the filter fits on
the transmitter. Use a cloth to
wipe them clean.
PS 595
JUNE 02
45
ometimes something real small can cause really big headaches. Dust is tiny, but
it packs a big, damaging punch like when it clogs the transmitter’s air filter on the
AN/GRC-103 radio.
Dust clogging the air filter makes the ventilation fan work harder and harder to
suck in cooling air. The transmitter overheats and the OVERHEAT lamp comes on
and stays on. The transmission signal degrades or the signal goes out altogether.
That’s just the begin-
ning of the problems.
Components begin to
burn
up—like
driver
tubes, the RF amplifier,
frequency generating cir-
cuits and the transmitting
section of the duplexer.
All this is
not good
and all this is
avoidable.
Overheat
lamp on?
Inspect
air filter!
Look at the filter before and during operations to make sure it’s
clean and stays that way. If you’re in a dusty environment, make
your checks more frequent.
If the filter is dusty,
remove it from the
transmitter by loosen-
ing the captive screws.
Use an air hose and air
gun to blow dust out of
the filter. Direct the air-
flow from the inside of
the filter to the outside.
Remove air
filter…
…and blow
out dust
Order replacement
filter with NSN
Wipe dust off
transmitter
Also wipe down
the transmitter
frequently to keep
dust away from the
ventilation fan.
Yikes!!
here
comes
the
dust
devil!
AN/GRC-103 Radio…
595. 44-45 (C)
4/27/02
2:40 PM
Page 1
Back to TopBack to Top
