C 3, TM 11-6625-623-45
FUNCTIONING OF MAINTENANCE KIT, ELECTRONIC
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
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.
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.
For applicable forms and records, see paragraph
1-3 TM 11-6625-623-12.
Section Il. FUNCTIONAL TEST SET BLOCK DIAGRAM ANALYSIS
1-5. Block Diagram Analysis
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
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
source. The input power is applied through