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Carefully position the replacement relay pins in
line with the relay receptacle, press the relay in
Repair parts for the C-2742/VRC are listed in
place and tighten the captive screws.
c. Inspect the parts inside the box for loose
a. Replace front panel control knobs and CON-
parts and damaged wiring; tighten all screws and
TROL indicator lamp DS71 as required. Tighten
nuts. Before replacing the back cover, apply a
the locknuts holding the knobs and receptacles.
light coating of insulating silicon compound (FSN
68508807616), or equal, to the preformed pack-
ing in the back cover. Replace the back cover and
the back cover from the box. Unscrew the captive
tighten the captive screws.
screws holding the relay and remove the relay.
DEPOT MAINTENANCE
Section III.
2-8. General
2325) from Cable Assembly, Special Purpose,
Maintenance of the C-2742/VRC at depot level
Electrical CX-4723/VRC.
facilities includes complete repair of the unit
and overhaul as required. It also includes checking
the performance of the repaired equipment for
conformance with the depot overhaul standards.
a. Troubleshooting.
(1) To test the C-2742/VRC before trouble-
shooting and after repair, use procedures given
Required
a. Test Equipment.
(2) Use TS-352B/U to make resistance and
continuity measurements of C-2742/VRC (figs.
(1) Multimeter TS-325B/U.
22 and 23). Following are typical resistance
(2) Power Supply PP-1104/G.
values (10 percent) of resistive circuits.
(a) Between pin M of J71 or J72 and
b. Test Facility. To facilitate connection to C-
ground, measure 110 ohms (DS71 and CR72).
2742/VRC circuits through connectors J71 and
(b) Between pin M of J72 and either U
J72, fabricate two test cables No. 3 as shown in
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