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|  98. Test Setup
jack.
Bench tests of Radio Sets AN/VRC-
24 and AN/TRC-68 require connections to
an external power source and to various
and AN/TRC-68
test equipments.
a. Power Source Required. The external
a. General. The troubleshooting chart
power source must be connected to the rt
below is divided as follows:
unit for all dynamic-servicing procedures.
(1) Subparagraph c is for the power
Measure and adjust the input voltage to ob-
supply and power circuits, OA-
tain a value as close as possible to the in-
2649/TRC-68.
put voltage specified for normal operation
(2) Subparagraph d is for the power
of the radio set.
supply and power circuits, OA-
(1) Radio Set AN/VRC-24 requires a
2648/VRC-24.
26.4-volt dc source capable of pro-
(3) Subparagraph e is for the rt unit of
viding 300 watts.
both radio sets.
(2) Radio Set AN/TRC-68 requires a
(4) Subparagraph f is for Radio Set
115- or 230-volt, 50/60-cps, 1-
Control C-1439/U.
phase ac source capable of pro-
b. Use of Troubleshooting Chart. This
viding 300 watts.
chart is designed to supplement the tests
b. Test Equipment Connections. Test
detailed in the equipment performance
equipment connections vary for each of the
checklist (TM 11-5820-222-20). If pre-
troubleshooting tests and are described in
vious tests have resulted in a symptom
the paragraph covering each test. Re-
that indicates the use of a particular sub-
ceiver-Transmitters RT-323/VRC-24 and
paragraph (a above), go directly to that
RT-441/TRC-68 can be removed from
subparagraph. When using the AN/TRC-
their respective cases for testing under
68 with Radio Set Control C-1439/U, and
operating conditions (TM 11-5820-222-
location of trouble is unknown, disconnect
20). After removing the rt unit, connect
the CX-4882/U from, the remote recep-
Electrical Special Purpose Cable Assem-
tacle at the rear of the AN/TRC-68 case.
bly CX-4884/U between rear plug P1 and
If the radio set now operates normally,
the mating connector (jack J1701 on Mount-
go directly to subparagraph f of the trou-
ing MT-1436/U or Jack J1401 on Receiver-
bleshooting chart.
Transmitter Case CY-2712/TRC-68).
Connect an audio test box, described in
Caution: If operational symptoms are
not known, or they indicate the possibility
AUDIO jacks to aid in making audio output
of short circuits within the radio set, make
measurements.
the short-circuit tests (para 97) before
applying power to the radio set.
Caution: Before performing any test
procedures requiring transmitter opera-
c. Troubleshooting Chart for OA-2649/
tion, be sure Signal Generator TS-497/
TRC-68, Power Supply and Power Cir-
URR is disconnected from the ANT jack
Item
Indication
Probable trouble
Procedure
1
AN/TRC-68 will not turn
Faulty circuit wiring in power
Remove Power Supply PP-1494/U and
supply, AN/TRC-68 case
on.
rt unit (TM 11-5820-222-20). Check
CY-2712/TRC-68, main
circuit resistance and continuity to
frame, or front panel.
isolate trouble (fig. 25 and 29). If
Faulty K1801, CR1813,
CR1814, CR1815, CR1816,
T1803, S1803, or S701.
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