the troubleshooting chart (d below). Parts
to the AN/VRM-l. Connect the AN/VRM-l
locations are shown in figures 12 through
as follows:
(1) Connect Mounting MT-1029/VRC
the TS-1777/VRM-l. Refer to figure 39 for
to the output of the PP-2309/U;
parts values. Figure 11 shows the wiring
use the CX-4720/VRC. Connect the
of switch S7902 .
black lead of the CX-4720/VRC to
the negative OUTPUT terminal of
b. Use of Chart. The troubleshooting
the PR-2309/U.
chart is designed to supplement the opera-
(2) Plug the three-terminal connector
tional checks detailed in TM 11-6625-496-
of the CX-7899/VRM-l into J24 of
12. If previous operational checks have
the MT-1029/VRC.
not been performed, perform the proce-
(3) Connect the four-terminal con-
dures given in the equipment performance
nector of the CX-7899/VRM-l to
checklist (TM 11-6625-496-12) and note
the POWER connector of the AN/
any troubles which appear.
VRM-1.
Caution: If operational symptoms are
Note: If Power Supply PP-2309/U is not
not known, or if they indicate the possi-
available, use an equivalent power source.
bility of a short in the dc supply circuit,
Connect it in the same manner as the PP-
2309/U.
perform the short-circuit checks in para-
b. Test Equipment. Connect the test
equipment as specified for the particular
unit .
test being performed.
c. Conditions for Tests. All checks out-
lined in the following chart are to be
33. Localizing Troubles
conducted with the AN/VRM-1 connected
to a power source as described in para-
a. General. Procedures for localizing
troubles to individual plug-in assemblies
and their associated circuits are given in
d. Troubleshooting Chart.
19
