TM 11-5820-896-20-1
5.2. COMPONENT REPLACEMENT.
The following charts show by radio system component, those actions required to remove and install each
component. These charts cover all components of a long range, dual radio system (AN/VRC-92). Skip any
component that is not a part of the system being worked on. The component that needs to be replaced will be
identified by inspection, as noted above, or through application of the Operational Check and related
Troubleshooting Flowcharts. A general rule is to remove only those components that are required for
maintenance.
REMOVE vehicular power from Mounting Base connector J1 before removing or replacing
components. If vehicular power is not removed, some connectors will have 22 to 32 V dc
present.
In replacing an LS-671 Loudspeaker, disconnect cable from Mounting Base connector J3 or
J4. If cable is not disconnected, there will be 22 to 32 V dc present at pin B of the open cable
connector.
DO NOT under any circumstances remove component covers or remove modules from
components. Opening components in the field will destroy them.
DO NOT tilt or twist the RT when removing it from, or replacing it in, a vehicular amplifier adapter
(VAA) to avoid damaging the connectors. The RT must be flat on the shelf and all the way to the
left side when mating the connectors.
a .
Receiver-Transmitter (RT):
TO REMOVE:
TO REPLACE:
(1) Set VAA CB1 to OFF; if used, set LS-671 CB1 to OFF
(1)
Position RT in VAA
(2)
Remove locking bar
(2)
Tighten VAA thumbscrews to secure RT
(3)
Disconnect W4 from RT
(3)
Connect W4 to RT
(4)
Disconnect RF cable from RT J1
(4)
Connect RF cable to RT J1
(5)
Loosen VAA thumbscrews securing RT
(5) Replace locking bar
(6)
Pull RT straight forward to clear VAA
(6)
Set VAA CB1 to ON; if used, set LS-671 CB1 tr, ON
5-4
