CHAPTER 2. MAINTENANCE

TM 11-6625-2975-40

MAINTENANCE

Subject

Page

Section

Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I

2-1

Performance Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II

2-1

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III

2-17

Alinement and Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. IV

2-31

General Support Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

2-45

S e c t i o n I REPAIR PARTS, SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT

Subject

Para

Page

Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-1

2-1

Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-2

2-1

2-1.

SPECIAL TOOLS, TMDE, AND SUPPORT EQUIPMENT.

Special tools, TMDE, and support equipment are listed in the repair parts and special tools list

(RPSTL), TM 11-6625-2975-24P, and in the Maintenance Allocation Chart (MAC) in

TM 11-6625-2975-12.

2-2. REPAIR PARTS.

Repair parts are listed and illustrated in the repair parts and special tools list (RPSTL),

TM 11-6625-2975-24P.

Section II PERFORMANCE TESTS

Para

Subject

Page

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-3

2-1

Initial Power On, Self-Test, and Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-4

2-2

Frequency Accuracy Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2-2

Frequency Response Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-6

2-5

Output Attenuator Accuracy Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-5

Modulation Tone Distortion Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2-6

9960 FM Deviation Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-9

2-7

VOR Radial Accuracy Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-10

2-8

LOC DDM Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-11

2-10

2-12

Glide Slope DDM Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-12

AM Modulation Peformance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13

2-14

Power Supply Performance Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-14

2-15

2-3. GENERAL.

The following tests will enable you to determine whether or not a test set is operating acceptably. Each

test procedure checks a specific function of the test set to help you find and isolate faults. When a fault

is evidenced by failure of the test set to meet a performance test standard, you will be referred to the

appropriate troubleshooting chart in section Ill of this chapter.

2-1