TM
5-5420-226 -20-1
(
(
DETAILED
TROUBLESHOOTING
PROCEDURE
SUPPORT
SYSTEM
- COMMUNICATIONS
(Continued)
Symptom-49
FROM
STEP
o10
I
I
Check if static is caused by personnel heater fuel
pump.
First
Technician
(Front
of Crew
Compartment)
l Disconnect
heater
to basket
disconnect
harness
connector
from
personnel
heater
fuel pump
(CKT
402).
Second
Technician
(Operators
Station)
l Set PERSONNEL
HEATER
HI/LO
switch
ON-LO.
First
Technician
(Commanders
Station)
l Turn on radio set (TM 5-5420-226-10).
l Listen for static in radio helmet.
Did static stop when personnel heater fuel pump
was disconnected?
Connect heater control
harness (CKT 402) at fuel
pump.
Replace personnel heater
(page 18-2).
Turn off radio set.
oNO
l Replace personnel heater
fuel pump (page 18-23).
Il Turn off radio set.
1-m
PERSONNEL HEATER
FUEL PUMP
u
HEATER
CONTROL
HARNESS
CONNECTOR
(CKT 402)
MASTER CONTROL PANEL
PER}ONNEL
HEATER
HI-LO SWITCH
TA107235
4-546