Chapter 3. ELECTRICAL AND ELECTRONIC EQUIPMENT

TM 750-245-4

CHAPTER 3

ELECTRICAL AND ELECTRONIC EQUIPMENT

Section I. INTRODUCTION

MWO application, and inventory to insure that there are

3-1. General

no missing items.

This chapter covers the inspection criteria for electrical

and electronic equipment. The chapter is arranged in a

b. In-Process Inspection.

This inspection is

normal inspection manner; chassis, electrical wiring,

performed to insure that procedures, processes,

plugs and jacks, switches and controls, motors, power

adjustments required during assembly, parts conform to

sources, and assembly components.

Soldering,

the prescribed standards, and that workmanship is in

because of its extensive coverage and importance, is

accordance with approved methods and procedures.

included separately as chapter 7.

Inspections are made to protect product quality and

integrity of processing.

Evidence of unacceptable

3-2. Definitions, Abbreviations, and Terms

workmanship or materials is cause for rejection of the

The inspector should refer to Appendix B for the

item and much closer inspection of the defects and

definitions, abbreviations, and terms applicable to

causes.

electrical and electronic equipment.

c. Final Inspection. This inspection is performed to

insure that all deficiencies have been corrected,

3-3. Types of Inspection

workmanship meets the standards, final configuration is

a. Initial or Receiving Inspection. This type of

correct, and that the item is operational within the

inspection is not normally accomplished by the QC

tolerances and limits established for the item. Those

inspector. The QC inspector may perform an initial or

items requiring maintenance calibration checks will have

receiving inspection when he determines that it is

a DA Label 80 attached to indicate accomplishment of

necessary. The inspection is performed to determine

the required checks.

the repairs required, proper identification of equipment,

Section II. CHASSIS ASSEMBLIES

before rejecting an item because of dents and

3-4. General

scratches.

This section covers the inspections required on the

chassis assemblies with respect to attaching hardware,

b. The inspector must determine, with the aid of

dents, scratches, weldments, finish and identification.

depth gages and other suitable equipment, whether to

reject or repair. In the majority of cases, repair can be

3-5. Attaching Hardware

accomplished. Any defect which would impair safety of

personnel or equipment must be rejected.

a. Attaching hardware is basically divided into two

broad categories: threaded and nonthreaded. Threaded

types include nuts, screws, bolts, studs, etc.

3-7. Weldments

Nonthreaded types include rivets, springloaded clamps,

The inspector should insure that all weldment repairs

and pins.

meet the inspection requirements as specified in chapter

b. Visual inspection will verify that the attaching

hardware is not scarred, battered or deformed by the

3-8. Finish

tools used in installation; that protective coatings remain

After repair, the chassis should be capable of meeting

intact and that there is no apparent deficiency in the

the inspection requirements for finish as specified in

hardware used.

chapter 2.

3-6. Dents and Scratches

3-9. Identification

a. The location and effect of dents and scratches

In accordance with the method of identification

upon item operation determines the critical importance

(identification plate, stencil marking, etc.) inspect for

and possible repair or rejection. The inspector should

clarity, legibility, and secure attachment.

consult the system maintenance manuals for guidance

3-1