Chapter 1. FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC EQUIPMENT MK-722/URC

C 3, TM 11-6625-623-45

CHAPTER 1

FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC

EQUIPMENT MK-722/URC

Section I. GENERAL

1.2. Indexes of Publications

1-1. Scope of Manual

a . This manual covers general support and

a. Refer to the latest issue of DA Pam 310-4 to

depot maintenance for Maintenance Kit, Elec-

determine whether there are new additions,

tronic Equipment MK-722/URC. It includes

changes or additional publications pertaining to

instructions appropriate to general support and

the equipment.

b. Refer to the latest issue of DA Pam 310-7 to

depot maintenance for troubleshooting, testing,

aligning, and repairing the equipment, and

determine whether there are modification work

replacing maintenance parts. It also lists tools,

orders (MWO'S) pertaining to the equipment.

materials, and test equipment for general support

1-3. Reporting of Equipment Manual

and depot maintenance.

Improvements

b. The purpose, operation, and interoperation of

Report of errors, omissions, and recommendations

the various circuits (electrical and electro-

for improving this manual by the individual user

mechanical ) in the MK-722/URC are explained in

is encouraged. Reports should be submitted on

paragraph 1-4 through 1-11. Familiarity with the

DA Form 2028 (Recommended Changes to

equipment, how it works, and why it works the

Publications and Blank Forms ) and forwarded

way it does are valuable tools in troubleshooting

direct to Commander, US Army Electronics

the equipment rapidly and effectively.

Command, ATTN: AMSEL-MA-A, Fort

c. The complete technical manual for this equip-

Monmouth, NJ 07703.

ment includes TM 11-6625-623-12.

NOTE

For applicable forms and records, see paragraph

1-3 TM 11-6625-623-12.

Section Il. FUNCTIONAL TEST SET BLOCK DIAGRAM ANALYSIS

1-4. Introduction

1-5. Block Diagram Analysis

(fig. 1-1)

The function test set (main component of the

Block diagram analysis of the function test set is

MK-722/URC) is used in the testing and trouble-

shooting of the receiver-transmitter (a component

covered in a through h below. For complete circuit

of Radio Set AN/ARC-102). The function test set

details, refer to the overall schematic diagram (fig.

acts as an accurate voltage comparator which is

4-11).

used to set critical voltages in the receiver-

a. Input Power Circuit. The 115-volt, 400-

transmitter. It is also used as a variable voltage

cycles-per-second (cps) input power is applied

source with three difference source impedances for

to the function test set from an external

test purposes.

source. The input power is applied through