TM 11-5841-291-12
d. When putting the equipment into
c. The equipment to be stored must
be in good working order. Perform the
administrative storage (1 to 45 days) use
operating procedure (paragraph 2-4) on
a storage area that is accessible. Equip-
the equipment prior to storage.
ment in administrative storage must be
able to be removed from storage and put
into operation on 24-hour notice.
Section III.
TROUBLESHOOTING
NOTE
3-6. General Troubleshooting. Trouble-
shooting either radar warning system is
The locations of antennas, low
based on finding a problem when you are
pass filter, and receivers vary
doing the PMCS. Use the information
from one type of aircraft to
in this section to find a faulty component
another. Refer to the aircraft
if the PMCS indicates you have a problem.
technical manual for the exact
3-7. Component Connectors and Fuse-
locations of these components.
holder.
a. Common Troubles. Table 3-4
a. Notice the connectors on the
lists common troubles you may find
control unit, receivers, and low pass
during operation or maintenance of the
filter. Also notice the fuseholder on
radar warning systems. Where the
the control unit. This is where the
corrective action column refers you to
fuse for the system is located. The
another table or paragraph, go there
fuse is a normal-blow type with a 0.25A
and do as instructed to perform addi-
at 250V rating.
tional tests or to correct a problem.
b. All connectors on the control unit
are multi-pin connectors. J1 and J3 are
used in Radar Warning System AN/APR-
44(V)1; J1, J2, and J3 are used in
Connectors (J1 and J2 to A1J3)
Radar Warning System AN/APR-44(V)3.
Connector pin
Signal name or voltage
and voltages connect to the pins of
(J1, J2, and
these connectors.
A1J3)
c. Connectors A2J1 and A2J2 on the
Logic audio in
1
receivers and all connectors on the low
pass filter are coaxial rf connectors.
Logic audio out
2
These connect to the system rf lines
from the antennas.
Audio drive
3
d. Use the illustration and tables 3-2
and 3-3 to help in troubleshooting. Use
Audio return
4
the multimeter to measure voltages and
to check continuity of the system's
5
SAM lamp drive
interconnecting cables when necessary.
6
AI lamp drive
3-8. Troubleshooting Data.
7
SAM logic out
AI logic out
8
Before replacing any radar warn-
ing system component, use air-
+28V on/off out
9
craft circuit breaker to turn off
(open) 28 Vdc to control unit.
Ground
10
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