Chapter 1. FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC EQUIPMENT MK-731/ARC-51X AND MK-731A/ARC-51X

C2,TM 11-6625-564-45

CHAPTER 1

FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC

EQUIPMENT MK-731/ARC-51X AND MK-731A/ARC-51X

Section I. GENERAL

1-1. Scope

tion work orders available through publica-

tions supply channels.

The index lists the

Note: Maintenance Kit, Electronic Equipment MK-

individual parts (-10, -20, -35P, etc) and the

731A/ARC-51X is similar to Maintenance Kit, Electronic

latest changes to and revisions of each

Equipment MK-731/ARC-51X. Information in this man-

equipment publication.

ual applies to both kits unless otherwise specified.

a. This manual covers general support and

1-3. Reporting of Equipment

depot maintenance for Maintenance Kit,

Manual Improvements

Electronic Equipment MK-731/ARC-51X and

The direct reporting of errors, omissions,

MK-731A/ARC-51X (referred to as the

and recommendations for improving this

maintenance kit).

It includes instructions

equipment manual, by the individual user, is

applicable to general support and depot

authorized and encouraged. DA form 2028

maintenance

for troubleshooting, testing,

will be used for reporting these improve-

aligning, repairing the equipment, and re-

ments. This form may be completed by the

placing maintenance parts.

It also lists

use of pencil, pen, or typewriter. DA form

tools, m a t e r i a l s , a n d t e s t e q u i p m e n t f o r

2028 will be completed by the individual using

general support and depot maintenance.

the manual and forwarded direct to Command-

b. The purpose, operation, and interopera-

ing General, U.S. Army Electronics Command,

tion of the various circuits (electrical, elec-

ATTN: AMSEL MA-AC

Fort Mon-

tronic, and electromechanical) in the main-

mouth, New Jersey 07703.

tenance kit are explained in paragraphs 1-

4 through 1-30. Familiarity with the equip-

1-4. Signal Paths of Simulator, Set,

ment, how it works, and why it works the

Radio

way it does are valuable tools in troubleshoot-

ing the equipment rapidly and effectively.

(fig. 4-8 and 4-8.1)

c. The complete technical manual for this

equipment includes TM 11-6625-564-12.

a. When Simulator, Set, Radio SM-348/

ARC-51X and SM-348A/ARC-51X (referred

Note: For applicable forms and records, see para-

to as radio set simulator) is used in the air-

graph 1-3 in TM 11-6625-564-12.

craft in place of the receiver-transmitter, it

generates test signals through interconnect-

1-2. Index of Publications

ing cabling to the associated aircraft equip-

Refer to the latest issue of DA Pamphlet

ment.

The radio set simulator has various

310-4 to determine whether there are new

indicators and a meter which show whether

editions, changes, or additional publications

the test signals returned from the other

pertaining to the equipment. Department of

units through the aircraft wiring are cor-

the Army Pamphlet No. 310-4 is an index of

rect.

A TEST SELECT switch, located on

current technical manuals. technical bulletins,

the front panel of the radio set simulator

supply manuals (types 7, 8, and 9), supply

(TM 11-6625-564-12), is used to connect the

bulletins, lubrication orders, and modifica-

meter into various circuits for monitoring