CHAPTER 5. DIRECT SUPPORT PERFORMANCE AND TROUBLESHOOTING PROCEDURES USING TEST CABLE NO. 1 AND DISCRETE TEST EQUIPMENT (TMDE)

TM 11-5820-401-34-3/0967-LP-432-3060

CHAPTER 5

DIRECT SUPPORT PERFORMANCE AND TROUBLESHOOTING

PROCEDURES USING TEST CABLE NO. 1 AND

DISCRETE TEST EQUIPMENT (TMDE)

Section

Page

Subject

5-1

Performance Tests . . . . . . . ............ . . .. . . . . . . . . . . . . . . . . . .

5-34

Troubleshooting . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . ..

Ill

Alinement and Adjustment Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

5-89

OVERVIEW

This chapter contains performance tests, troubleshooting, and alinement procedures at thedirect

support level using Test Cable No. land discrete test equipment (TMDE).

The performance tests are diagnostic inpurpose. They should be used toverifythat an R-442/VRCis

operating properlyorto point out the existence of faults.

If failure to meet a performance test standard confirms that afaultis present inthe unit undervest, the

test procedure will refer you to a specific chart in the troubleshooting section. The troubleshooting

charts are designed to isolate the faults noted in the performance tests. They will guide you to the

source of defects and/or misalinements.

Once it has identified the source of a fault, a troubleshooting chart will refer you to the appropriate

repaidreplacement instructions or alinement procedure. Because each stage of the receiver

depends upon its other stages for overall operating efficiency, the replacement, repair, or

real inement of even one component could alter the signals enough to create the need for other

real inements. Therefore, after making any alterations in the R-442PJRC, do all the performance

tests, even those you have done already.

Section I PERFORMANCE TESTS

Para

Page

Subject

5-1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

VOLUME Control Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Receiver Sensitivity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3

5-4

5-8

NEW SQUELCH Test. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-5

5-12

OLD SQUELCH Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-6

5-15

Receiver Audio Power Test . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-7

5-18

Receiver Audio Distortion Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-8

5-21

Receiver Audio Response Test (Normal Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-25

5-9

Receiver Audio Response Test (X-Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-10

Receiver Selectivity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-30

GENERAL.

5-1.

This section contains performance test procedures for use with Test Cable No. 1 and discrete test

equipment (TMDE). They will enable you to determine whether or not an R-442/VRC is operating

acceptably. Each test procedure checks specific functions of the receiver to help you find and isolate

faults.