TM 11-5841-291-12
List of Common Troubles - Continued
Table 3-4.
Corrective action
Malfunction
Probable cause
Defective antenna
Replace antenna. (See
a.
a.
No signal from
paragraphs 3-15 and
one antenna.
3-16.)
Perform threshold tests.
b.
Defective coaxial cable
b.
(See paragraph 3-9c,
or low pass filter.
3-9d, or 3-9e.) Indi-
cation in control unit;
replace antenna cable.
No indication in control
unit; replace low pass
filter. (See paragraphs
b. Fault Isolation. Two technicians
Each replaceable item is checked;
if it is faulty a repair action is
are required when using the organiza-
cited. Upon completion of a re-
tional-level troubleshooting flow charts
pair action, the path loops back
in figures FO-1 and FO-2 to isolate
to test for effective repair.
faulty components of the radar warning
For removal and replacement
systems. The flow charts give you a
procedures, refer to para-
logical sequence that can be followed
graphs 3-11 thorugh 3-19.
step-by-step to identify the cause of a
problem and to tell you what to do to
THE POINT AT WHICH THE
correct the problem. To understand the
TROUBLESHOOTING ACTION
flow charts, learn the meaning of the
STARTS OR CONTINUES. HAS
ONLY ONE EXIT PATH.
symbols which are illustrated and defined
here. Then, to use the flow chart:
A QUESTION BLOCK. QUESTIONS
ARE ANSWERED YES OR NO BY
REFERENCE TO RESULTS RE-
(1) Start the flow chart at the
CORDED DURING SELF TEST OR
ENTER symbol in the upper
PERFORMANCE OF THE CHECK
SPECIFIED IN A PREVIOUS IN-
left-hand corner.
STRUCTION BLOCK. THERE MAY
BE ONE OR MORE ENTRY PATHS.
ALWAYS HAS TWO EXIT PATHS
(2) Follow the arrows to the first
(YES AND NO). LEAVE THE SYM-
symbol.
BOL ALONG APPLICABLE EXIT
PATH.
(a) Perform the specified action,
AN INSTRUCTION BLOCK. PRO-
VIDES INFORMATION FOR:
if an instruction block, and
CONTROL SETTINGS, ADDITION-
follow the arrow to the next
AL CHECKS, REPAIR ACTIONS,
TEST EQUIPMENT TO BE USED,
symbol.
ETC. WHEN NECESSARY, REFER-
ENCES TEXT MATERIAL OR
ILLUSTRATIONS WHICH CON-
(b) Answer the question, if a
TAIN NECESSARY INFORMATION.
question symbol, with refer-
MAY HAVE MORE THAN ONE
ENTRY PATH. HAS ONLY ONE
ence to the results of the
EXIT PATH.
action of the previous instruc-
JUNCTION POINT. A POINT
tion block or applicable test.
WHERE TWO OR MORE PATHS
JOIN TO PROCEED IN A COMMON
PATH. HAS TWO OR MORE ENTRY
(3) Continue following the arrows
PATHS. HAS ONLY ONE EXIT
PATH.
with regard to question answers,
performing the specified actions.
ARROWHEAD ESTABLISHES
DIRECTION OF FLOW.
3-5
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