Chapter 7 DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS

CHAPTER 7

DIRECT SUPPORT (INTERMEDIATE) MAINTENANCE INSTRUCTIONS

Section I. GENERAL

7-1. Introduction

and then to a defective module. The following is a list of

four logical steps to follow in order to troubleshoot the

This chapter provides the information necessary to

equipment efficiently.

maintain the processor and transceiver at the direct

support (intermediate) maintenance level.

These

a. History of Equipment. The repairman can

instructions are intended to assist the maintenance

obtain helpful information by questioning organizational

technician in determining whether the equipment is

maintenance personnel, by reading the complaint notice

operating properly, and if not, to localize the malfunction

attached to the equipment, and by reading the

to the level assigned by the Maintenance Allocation

equipment log. The more information the repairman

Chart (MAC).

The order of presentation of this

can gather, the more accurate his diagnosis will be and

maintenance information is arranged in a sequence

the sooner the trouble can be located and repairs made.

which is logical in terms of specific maintenance steps

required to maintain the processor and transceiver at

Preliminary Examination.

A preliminary

the direct support (intermediate) maintenance level.

examination will help in gathering evidence that may

lead to the location of the defect. Symptoms may be

a. Detecting faulty operation. The performance

obtained by observing the equipment for the following:

test (para. 7-12) is provided for use in determining

inadequate surveillance coverage, abnormal nuisance

minimum equipment performance requirements.

alarms, discolored components, or the presence of

smoke by smelling to detect the odor of burned

b. Locating Trouble. A troubleshooting chart is

insulation and parts.

provided to aid in locating trouble in a minimum amount

of time.

The troubleshooting chart (para. 7-8) is

c. Sectionalization. Sectionalization of trouble

designed to enable the repairman to locate trouble

consists of t acing the trouble to the functional pc board

based on indications obtained when the processor and

responsible foe the abnormal performance. Use the

transceiver(s) are operating.

information obtained from the procedures given in a and

b above and the troubleshooting chart as a quick check

Check Serviceability.

Direct support

in sectionalizing the trouble. Perform each step (or

(intermediate) testing procedures designed to check the

applicable steps) in the troubleshooting chart to

serviceability of repaired items of equipment are

sectionalize the trouble to a pc board or a transducer.

included in Section V. The test procedure is presented

in tabular format.

d. Testing After Repairs. After a faulty pc board

or transducer is located and replaced, the equipment

7-2. Troubleshooting Techniques

may not be free of faults. Some other faults (which has

not been detected and corrected) may have caused the

To be effective, troubleshooting must be systematic. It

failure of the part that has been replaced, or the

is seldom possible to observe a symptom of trouble and

repairman may have inadvertently caused a trouble.

immediately diagnose the cause. Usually, it will be

After the faulty component has been replaced, the

necessary to perform a sequence -of operational

equipment should be given an overall performance test,

checks, observations, and measurements before the

(para. 7-12) and the results compared with the

cause of a trouble is revealed. If the proper sequence is

performance requirements of the equipment.

followed, the trouble will be traced to a functional unit

Section II. TOOLS AND EQUIPMENT

7-3. Tools

as authorized by the Maintenance Allocation Chart

(MAC). Equivalent instruments may be used unless

The tools required for direct support (intermediate)

otherwise stated. The information provided in these

maintenance are contained in TK-105/G.

tables is not to be used as a basis for requisitioning. For

requisitioning test equipment and repair parts, refer to

7-4. Test Equipment

Repair Parts and Special Tools List (RPSTL), Appendix

This section provides a list of test equipment (table 7-1)

required for direct support (intermediate) maintenance

7-1