TM 11-5840-281-12-1
Section IV. ORGANIZATIONAL TROUBLESHOOTING
Subject
Para
Page
General ............................................................................................................................ 4-31
Symptom Index ................................................................................................................4-31
Troubleshooting Procedures............................................................................................. 4-32
4-31. GENERAL.
The troubleshooting table lists malfunctions that may be found while performing PMCS or when equipment is being
operated. Before performing troubleshooting procedures, check that all controls and switches are in the proper positions
for the mode of operation you are in.
The troubleshooting table does not list all problems that may occur. If your problem is not listed, or if the procedures
given do not correct the problem, report it to a higher category of maintenance.
When working on any problem, be sure to report your work on the forms shown in DA PAM 738-750.
To use the troubleshooting table, first locate your problem in the symptom index. The index is divided into two parts.
Part 1 lists symptoms that may be found when operating radar set with or without associated IFF equipment. Part 2
gives symptoms that may be found that are related specifically to IFF equipment. The index will give you a page number
on which you will find your problem and the possible corrective actions. Turn to the page indicated, locate the problem,
and follow the corrective actions given. After a troubleshooting procedure has been accomplished, perform the
operational checks in paragraph 3-6 to ensure the equipment is functioning properly.
SYMPTOM INDEX
Page
PART 1
Radar set does not operate when MAIN POWER switch on receiver-transmitter
main power panel is placed to ON position .................................................................................. 4-106
Blank crt on either control-indicator ........................................................................................................... 4-107
No radar video or weak radar video, and HV ON indicator switch on either
control-indicator is illuminated ..................................................................................................... 4-108
No radar video and HV ON indicator switch on either control-indicator is
not illuminated ............................................................................................................................. 4-109
No radar video and HV ON indicator switch on either control-indicator is
not illuminated. Antennas do not scan or scan erratically ............................................................. 4-109
Operational controls on master control-indicator do not function ............................................................... *
Indicator switches on transmitter control panel do not light when pressed .................................................. 4-111
Ppi sweep length is short in any range on either control-indicator .............................................................. 4-111
Timebase sweep is short or does not begin under center gridline of
navigational grid in any range on either control-indicator when in
NORM, 35EL, 600AZ, or SIMULT mode ................................................................................................. 4-111
PPI DELAY or PREC DELAY controls have no effect on positioning of range-
marks on either control-indicator .................................................................................................. *
Intensified dot but not timebase sweep on crt of either control-indicator
in SEARCH mode ........................................................................................................................ *
Intensified dot but no timebase sweep on crt of either control-indicator
in NORM, 35EL, or 60AZ modes ............................................................................................... 4-111
Timebase sweep on crt of either control-indicator will not rotate in
SEARCH or SIMULT modes ..................................................................................................................... *
4-105
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