Types of Operation.

TM 11-6625-409-12

g. Operate the 27.5 VOLTS DC switch to ON;

2-6. Types of Operation.

operate the 27.5 VDC-DC ADJUST switch to 27.5 VDC.

h. The test-lamps on the front panel of the

a. Test Set,, Radio AN/ARM-45(*), may be used

MX3736/ARM-45 should light as indicated in the chart

either to test the wiring and control circuits of Radio Sets

(para 2-3 b (6) and (7)) for the frequency set on the

AN/ARC-73 and AN/ARC-73A within the aircraft or to

aircraft transmitter remote control unit.

perform operational tests of Transmitter 17L-7A and

NOTE

Receiver 51X-2B at the maintenance bench. Detailed

instructions covering the operation and connection of the

The setting of the megacycle and kilocycle

AN/ARM-45(*) during testing of the AN/ARC-73 and

controls on the MX-3736/ARM-45 remote

AN/ARC-73A components are given in other technical

control unit will not affect the test lamp

manuals.

indications during the test.

b. For any type of operation, perform the following

i. Check the aircraft transmitter remote control unit

procedures:

and the associated aircraft wiring by operating the

(1) Preoperational tests (para 2-3).

remote control unit megacycle and kilocycle controls

(2) Connecting and control setting procedures

through the frequency ranges given in the chart. Check

for the desired type of operation (para 2-7, 2-8, or 2-9).

for the proper test-lamp indication.

j. Check the operation of the aircraft vhf control

(3) Stopping procedures (para. 2-10).

circuit by connecting a microphone to the microphone

jack in the aircraft and pressing the push-to-talk switch.

2-7.

Testing Transmitter Remote Control Unit

The MIC KEY test lamp on the MX-3736/ARM-45 should

and Associated Wiring in Aircraft.

light.

(A, fig. 2-6)

k. Disconnect cables No. 1 and No. 1A from the

MX-3736/ARM-45 and from the shockmount. Replace

The following procedures describe typical methods for

the 17L-7A in the shockmount (TM 11-5821-217-12). If

using the AN/ARM-45(*) to test the transmitter -control

no additional tests are to be performed, disconnect cable

circuit wiring within the aircraft.

No. 2 and store all cables in the case. Close and latch

a. Unlatch and remove the case cover on the MX-

the case cover.

3736/ARIM-45. Remove cables No. 1, No. 1A, and No.

3 from the case storage compartment. Raise the covers

2-8.

Testing Receiver Remote Control Unit and

on the test cable receptacles (fig. 2-4).

Associated Wiring in Aircraft.

b. At the AIRCRAFT TEST VHF XMTR 17L-7A test

(A, fig. 2-6)

cable receptacles, connect one end of cable No. 1 to

The following describes typical procedures for using the

XMTR PLUG TOP receptacle J-103-7A; connect one

AN/ARM-45 to test the receiver control circuit wiring

end of cable No.

1A to XMTR PLUG BOTTOM

within the aircraft.

receptacle J-104-7A.

a. Unlatch and remove the MX-3736/ARM-45 case

c. Remove transmitter 17L-7A from Dual

cover. Remove cable No. 2 and cable No. 3 from the

Shockmount 390E-2 in the aircraft (TM 11-5821-217-12).

case storage compartment. Raise the covers on the test

Connect the other end of cable No. 1 to the top

cable receptacles (fig. 2-4).

receptacle at the rear of the shockmount; connect the

b. Connect one end of cable No. 2 to ACFT TEST

other end of cable No. 1A to the bottom receptacle at

VHF RCVR 51X-2B receptacle J-106-2B.

the rear of the shockmount.

c. Remove Receiver 51X-2B from Dual Shock-

d. If 27.5 volts dc is available within the aircraft,

mount 390E-2 (TM 11-5821-217-12). Connect the other

operate the EXT POWER-SHIP POWER switch on the

end of cable No. 2 to the receptacle at the rear of the

MX-3736/ARM-45 to SHIP POWER and continue with

shockmount.

the instructions given in g below.

d. Connect the MX-3736/ARM-45 to the source of

e. If 27.5 volts dc is not available within the aircraft,

27.5-volt dc power as described in paragraph 2-7d or e,

connect the connector end of cable No. 3 to AC DC

as applicable.

POWER receptacle J-107. Connect the red and black

e. Operate the EXT POWER-SHIP POWER switch

clip leads on the other end of the cable to the positive

to the appropriate position.

and negative terminals, respectively, of an external 27.5-

f. Operate the 27.5 VOLTS DC switch to ON;

volt dc power source. Observe proper polarity.

f. Operate the EXT POWER-SHIP POWER 3witch

operate the 27.5 VDC-DC ADJUST switch to 27.5 VDC.

g. The test lamps on the front panel of the MX-

to EXT POWER.

3736/ARM-45 should light as indicated in the

2-9