Chapter 1. INTRODUCTION - TM-5-6675-309-140013

ARMY TM 5-6675-309-14

MARINE CORPS TM 08840A-14/1

CHAPTER 1

INTRODUCTION

Section I. GENERAL

1-1. Scope. This manual covers maintenance instruc-

the equipment design or use. It is not necessary to show

tions for Power Supply Test Set AN/USM-428 (PSTS).

a new design or list a better way to perform a proce-

Unpacking and installation instructions, operating in-

dure, just tell why the design is unfavorable or why a

structions, and functioning of equipment are also in-

procedure is difficult. EIRs may be submitted on SF

cluded.

(Standard Form) 368 (Quality Deficiency Report). Mail

directly to:

1-2. Maintenance Forms and Records. Department of

Commander, U.S. Army Troop Support Command

the Army forms and procedures used for equipment

ATTN: AMSTR-MOF

maintenance will be those prescribed by DA PAM 738-

4300 Goodfellow Blvd.

750, the Army Maintenance Management System

St. Louis, MO 63120-1798

(TAMMS) or TM 4700-15/1, the Marine Corps.

Marine Corps users shall submit NAVMC FORM 10772

1-3. Destruction of Army Materiel to Prevent Enemy

"Reporting Errors and Recommending Improvements."

Use. Refer to TM 750-244-2 for procedures for destruc-

Send to:

tion of this equipment to prevent enemy use.

Commandant of Marine Corps

Headquarters, Marine Corps

1-4. Administrative Storage. Refer to TM 740-90-1 for

Code LMA-1

procedures, forms, records, and inspections required

Washington, DC 20380

during administrative storage of the PSTS. Marine

Corps users shall refer to MCO 4450.7 for this informa-

A reply will be sent directly to you.

tion.

Calibration. No calibration of the PSTS is required.

Specific adjustment procedures are in chapter 8.

1-6. Reporting Equipment Improvement Recommen-

dations (EIR). EIRs can and must be submitted by

anyone who is aware of an unsatisfactory condition with

Section Il. DESCRIPTION AND DATA

(1) The PSTS is used to verify a fault, isolate the

1-7. Purpose and Use.

fault to a plug-in module or chassis-mounted compo-

a. Purpose. The PSTS is specifically designed for

nent, and to verify correct operation after repair.

testing and troubleshooting Power Supply PP-7352/

(2) The PSTS tests for proper operation of over-

USQ-70 and computer power supply (part of Computer

voltage, undervoltage, and overcurrent circuitry in the

CP-1283/USQ-70). Both power supplies are part of the

unit under test (UUT). Each test is made using various

Position and Azimuth Determining System AN/USQ-

loads, input voltages, or control signals. The UUT

70. These equipments are referred to herein as PADS

monitor and control signals are tested by controls,

PS (or PS), and PADS COMP PS (or COMP PS). Al-

indicators, and test jacks on the PSTS front panel. The

though both power supplies are tested on the PSTS,

test jacks are monitored using the GFE oscilloscope or

only one can be connected and tested at any given time.

multimeter.

A fixed 28-VDC power source and a variable 0-to 40-

VDC power source are required to supplement the

PSTS testing of the power supplies. These power

sources are switched within the PSTS.

b. Use.

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