CHAPTER 4. GENERAL SUPPORT MAINTENANCE

TM 11-5820-509-35

CHAPTER 4

GENERAL SUPPORT MAINTENANCE

with each respective performance standard to assure

4-1. General

proper operation of the radio set.

a. The tests presented in this chapter verify the

4-2. Test Equipment Required

proper operation of Radio Set AN/PRC-47 after repair

procedures have been completed.

All test equipment and materials required to perform the

b. The instructions that precede each performance

procedures shown in this chapter are listed in the

chart establish the test conditions and present specific

following chart. No special tools or materials are

information for a given test. Perform each test in the

required for these tests.

sequence shown being careful to complete all actions

required by the procedure. The test results must agree

Test equipment

FSN

Technical manual

Multimeter ME-26A/U

6625-542-6407

TM 11-6625-200-15

Oscilloscope AN/USM-50

TM 11 -5 129

Signal Generator SG-103/URM-25F

Frequency Counter AN/URM-79/U

Audio Oscillator TS-382/U

6625-246-8729

TM 11-6625-935-12

Dummy Load DA-75/U

Cable Assembly Set AN/PRA-4

5995-973-3686

Output Meter TS-585/U

TM 11 -5017

Radar and Radio Repair Tool Kit TK-87/U

Radar and Radio Repair Supplementary Tool Kit TK-88/U

Spectrum Analyzer TS-723A/U

6625-668-9418

TM 11 -5097

4-5. Physical Tests and Inspection

4-3. Test Facilities

Perform each of the following steps to assure

compliance with the maintenance standard.

A primary power source of 115 volts, 400 Hz, single-

phase alternating current at approximately 3.0 amperes,

and a 26.5-volt direct current source at approximately

NOTE

11 amperes is required for these tests.

Remove Radio Receiver-Transmitter

4-4. Modification Work Orders

RT-671/PRC 47 from its case using

the procedures detailed in paragraph

The performance standards listed in the tests (pare 4-5

3-11.

through 4-19) assume that all applicable modification

work orders have been performed.

Test

Radio

Step equipment control

Test

Performance

settings

procedures

standards

n/a

a. Inspect all gears and mechanical assemblies

a. Screws, setscrew, bolts, and nuts must

for loose or missing hardware.

be tight, no missing parts.

b. Inspect all connectors, sockets, receptacles,

b. All items secured tightly to panel with no

fuse holders, and lamp sockets for looseness

evidence of damage.

or damage.

n/a

a. Rotate whole megahertz frequency control

a. Bandswitch gears in signal data translator

knob one step at a time from 2000 to 11000

(A3), oscillator control (A7), and in

on KILOCYCLES indicator.

Bandswitch assembly, rotate freely one

step at a time as knob is turned.

n/a

b. Rotate 100-kHz frequency control knob one

b. Slug rack in signal data translator (A3)

step at a time from X000 to X900 on

withdraws smoothly as knob advances

KILOCYCLES indicator.

one step at a time.

a. Inspect case and chassis for damage,

a. No damage or missing parts visible;

missing parts, the condition of the finish, and

external surfaces originally painted show

panel lettering. Modules must be removed to

no bare metal. Panel lettering legible.

complete this inspection.

NOTE

Paint should be touched up in lieu of refinishing whenever practical. Screw heads, binding posts, receptacles, and plated

parts are not painted and must not be polished with abrasives.

b. Inspect all wiring in the area of repairs for

b. All repaired or disturbed electrical wiring

cracks, chips, or other breaks in the moisture-

and components are secured and

proofing varnish.

moisture-proofed.

Change 1 4-1