TM 11-5985-355-13
CHAPTER 6
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
Section I. TROUBLESHOOTING
5120-00-568-4742).
6-1. Scope of Direct Support Maintenance
b. Test Equipment.
The direct support maintenance instructions supplement
(1)
Receiver-Transmitter,
Radio
RT-
the maintenance procedures covered in the technical
524/VRC, or RT-246/VRC.
manual for the radio set with which the AS-2731/GRC is
(2) Wattmeter AN/URM-120.
used. A troubleshooting chart is given in paragraph 6-4;
(3) Multimeter TS-352B/U.
repair procedures are given in paragraphs 6-5, 6-6, and
c. Materials. Refer to appendix E for materials
6-7, and performance test procedures are given in
required for direct support maintenance.
6-3. Direct Support Maintenance Trouble-
6-2. Tools, Test Equipment, and Materials Re-
shooting
quired
Perform the applicable direct support procedures as
The following tools, test equipment, and materials, or
outlined by the technical manual for the radio r/T unit
appropriate equivalents, are required to perform direct
used with the AS-2731/GRC. If the AS-2731/GRC is
support maintenance:
defective, perform the troubleshooting procedures given
a. Tools.
in troubleshooting chart (table 6-1). If the corrective
(1) Tool Kit, Electronic Equipment TK-
measures given in the chart do not clear the trouble,
101/G.
higher category of maintenance is required.
(2) Tool Kit, Electronic Equipment TK-
100/G.
(3) Torque screwdriver, 0-Z5 inch-lb (NSN
Section II. REPAIR PROCEDURES
and duplicate the original position after repair.
6-4. General
6-6. Antenna Element AS-27321GRC Parts
This section contains direct support repair procedures for
the AS-2731/GRC.
Removal and Replacement
(fig. 6-1)
limited to the removal and replacement of certain parts
a. Contact (SM-B-542008).
(1)
Remove contact (SM-B-542008) by
removing two screws (MS51957-1).
consist of parts removal and replacement (para 6-7) and
(2) Replace contact (SM-B-542008) with the
performance tests (para 6-8).
screws removed in (1) above. Apply 1 or 2 drops of
6-5. Special Precautions
sealing compound (item 7, app E) after starting the
Observe the following precautions when
screws.
a.
b. Contact (SM-B-542007) and Contact Spring
removing and replacing wires. When soldering or
Assembly Parts.
unsoldering wires, solder quickly to allow as little heat
(1)
Unscrew and remove ring (SM-B-
conduction as possible. However, avoid making a cold-
889201). Tap the AS-2731/GRC on the bench to
remove contact (SM-B-542007), insert (SM-B-542004),
applied. When wiring permits, use a heat sink (such as
and spring (SM-B-542006).
long-nosed pliers) between the soldering iron and a
(2) Replace the parts in the sequence
component.
Excessive heat may damage the
shown in figure 6-1 and tighten ring (SM-B-889201).
component.
b. Orientation of Parts. When an electronic part is
moved aside, note the position of the part and its leads
Change 2 6-1
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