TM 11-5840-281-35/1
CHAPTER 3
DIRECT SUPPORT MAINTENANCE
Section I. GENERAL
is then referred to a higher category of maintenance for
3-1. Scope of Maintenance
repair and disposition.
a. Troubleshooting (para 3-3 through 3-14).
The maintenance duties of the direct support
b. Equipment adjustments and alignments (para 3-15
maintenance repairman include the maintenance
responsibilities of the operator and the organizational
c. Equipment repair (para 3-47 through 3-49).
maintenance repairman described in TM 11-5840-281-
d. Removal-replacement and disassembly-assembly
12, in addition to the duties listed in paragraphs a
through d below. References in paragraphs a through d
below refer to paragraphs covering specific maintenance
3-2. Tools, Test Equipment, and Materials Required
functions. Refer to paragraphs 4-1 through 4-3 for
Refer to the maintenance allocation chart (MAC), in TM
testing procedures and performance standards to be
11-5840-281-12, for the allocation of maintenance
used after equipment repair to ensure that the equipment
responsibilities, tools, and test equipments. Refer to TM
is operating satisfactorily. Generally, when a trouble
11-5840-281-35P for applicable repair parts lists.
occurs, the direct support maintenance repairman
isolates the trouble to the lowest order replaceable item
(unit, assembly, or circuit card). If the item is not
reparable by replacement of fuses, tubes, or pluckout
relays, he replaces the defective item with an operational
spare and performs the necessary alignment and tests to
insure satisfactory system operation. The defective item
Section II. DIRECT SUPPORT TROUBLESHOOTING
Symptom recognition
3-3. General
Symptom elaboration
Listing of probable faulty functions
This section includes troubleshooting, voltage-
Isolating trouble to a functional section
resistance and waveform charts, and a system timing
Isolating trouble within a functional section
chart to assist in isolating troubles to a replaceable unit,
to a unit, assembly, or circuit card.
assembly, or circuit card. When a trouble exists in the
Isolating trouble to a replaceable pluckout
equipment, locate the symptoms in the trouble symptom
item (tube or relay), if applicable.
column of the troubleshooting charts (para 3-10 and 3-
11) and follow the applicable instructions in the checks
and corrective actions column. The troubleshooting
3-4. Symptom Recognition
procedures (para 3-10) are based on the logical
troubleshooting steps (method) listed below and
The first step in troubleshooting is recognition of the
described in paragraphs 3-4 through 3-9 below. If the
trouble symptom and is based on a knowledge and
troubleshooting procedures are not applicable to the
understanding of equipment operating characteristics.
trouble symptoms, follow the troubleshooting method
All equipment troubles are not easy to recognize and
described in paragraphs 3-4 through 3-9 below.
some conditions of marginal performance are not readily
apparent without the use of test equipment. Information
and data displayed on the cathode-ray tubes in Control-
Indica-
3-1
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