DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS
Section I. GENERAL
and then to a defective module. The following is a list of
four logical steps to follow in order to troubleshoot the
This chapter provides the information necessary to
maintain the processor and transceiver at the direct
support (intermediate) maintenance level.
a. History of Equipment. The repairman can
instructions are intended to assist the maintenance
obtain helpful information by questioning organizational
technician in determining whether the equipment is
maintenance personnel, by reading the complaint notice
operating properly, and if not, to localize the malfunction
attached to the equipment, and by reading the
to the level assigned by the Maintenance Allocation
equipment log. The more information the repairman
The order of presentation of this
can gather, the more accurate his diagnosis will be and
maintenance information is arranged in a sequence
the sooner the trouble can be located and repairs made.
which is logical in terms of specific maintenance steps
required to maintain the processor and transceiver at
the direct support (intermediate) maintenance level.
examination will help in gathering evidence that may
lead to the location of the defect. Symptoms may be
a. Detecting faulty operation. The performance
obtained by observing the equipment for the following:
test (para. 7-12) is provided for use in determining
inadequate surveillance coverage, abnormal nuisance
minimum equipment performance requirements.
alarms, discolored components, or the presence of
smoke by smelling to detect the odor of burned
b. Locating Trouble. A troubleshooting chart is
insulation and parts.
provided to aid in locating trouble in a minimum amount
The troubleshooting chart (para. 7-8) is
c. Sectionalization. Sectionalization of trouble
designed to enable the repairman to locate trouble
consists of t acing the trouble to the functional pc board
based on indications obtained when the processor and
responsible foe the abnormal performance. Use the
transceiver(s) are operating.
information obtained from the procedures given in a and
b above and the troubleshooting chart as a quick check
in sectionalizing the trouble. Perform each step (or
(intermediate) testing procedures designed to check the
applicable steps) in the troubleshooting chart to
serviceability of repaired items of equipment are
sectionalize the trouble to a pc board or a transducer.
included in Section V. The test procedure is presented
in tabular format.
d. Testing After Repairs. After a faulty pc board
or transducer is located and replaced, the equipment
7-2. Troubleshooting Techniques
may not be free of faults. Some other faults (which has
not been detected and corrected) may have caused the
To be effective, troubleshooting must be systematic. It
failure of the part that has been replaced, or the
is seldom possible to observe a symptom of trouble and
repairman may have inadvertently caused a trouble.
immediately diagnose the cause. Usually, it will be
After the faulty component has been replaced, the
necessary to perform a sequence -of operational
equipment should be given an overall performance test,
checks, observations, and measurements before the
(para. 7-12) and the results compared with the
cause of a trouble is revealed. If the proper sequence is
performance requirements of the equipment.
followed, the trouble will be traced to a functional unit
Section II. TOOLS AND EQUIPMENT
as authorized by the Maintenance Allocation Chart
(MAC). Equivalent instruments may be used unless
The tools required for direct support (intermediate)
otherwise stated. The information provided in these
maintenance are contained in TK-105/G.
tables is not to be used as a basis for requisitioning. For
requisitioning test equipment and repair parts, refer to
7-4. Test Equipment
Repair Parts and Special Tools List (RPSTL), Appendix
This section provides a list of test equipment (table 7-1)
required for direct support (intermediate) maintenance