TM 5-5420-226-20-1
—
Symptom-49
DETAILED
TROUBLESHOOTING
PROCEDURE
SUPPORT
SYSTEM
- COMMUNICATIONS
STATIC
OR WHINING
NOISE
IN RADIO.
(ELECTROMAGNETIC
INTERFERENCE
- EMI)
“
r
--L--cAUTION-----,
Turn off radio set (TM 5-5420-226-1 0)
I
before
starting
engine to prevent
~
1 possibledamage to communiCaticms
.
~ equipment.
I
1
k--
~-----------l
I
This procedure is to be performed by
two
persons.
The
lead person
is
referred to as the first technician and
I
[
shall direct the activity of the second
I
r-.,
L
IL
“m,
1A
q
‘
I
~’
person called the second technician.
‘AsT&j&ERy
MASTER
CONTROL
PERSONNEL
HEATER
PANEL
HI-LO SWITCH
Check if static is caused by vehicle electrical
equipment (vehicle not moving).
Second Technician
(Operator’s
Station)
l Start engine.
l Set PERSONNEL HEATER HI/LO switch
ON - LO.
l Check that LIGHTING CONTROL switch is OFF.
l Set NIGHT VISION switch ON.
l Set VENTILATOR
switch ON.
First Technician
(Commander’s
Station)
l Turn on radio set (TM 5-5420-226-10).
l Listen for static in radio helmet.
/
Can static be heard when vehicle electrical
equipment is operating - vehicle not moving?
m
.
FOR CLARITY
QUADRANT
ASSEMBLIES
NOT SHOWN
u
l EMI is a result of vehicle
movement - check if static is
caused by broken or missing
static springs in support
rollers.
o
l See Step 14 .
TA107218
4-529
