Chapter 5. GENERAL SUPPORT MAINTENANCE

TM 11-6625-2946-14/TM 08168A-14/1

CHAPTER

GENERAL SUPPORT MAINTENANCE

NOTE

No Direct Support maintenance of the test set

organizational repair shops and forward them

is authorized. Direct Support maintenance ac-

to the applicable General Support maintenance

tivities will receive defective test sets from

activity for maintenance.

Section L GENERAL

5 - 2 . Tools and Equipment

5 - 1 . Scope.

The tools and test equipment required for the perfor-

This chapter contains the troubleshooting, performance

mance of the maintenance instructions are listed in the

testing, and alignment procedures required to test, ser-

Maintenance Allocation Chart, Appendix B. Equivalent

vice, and repair the test set at the General Support

test equipment items may be substituted as necessary.

maintenance level. A schematic diagram (fig. F0- 1 ) and

No special tools or test equipment are required.

a component and test point location illustration (fig.

5-1 ) are provided to assist the technician in the measure-

ment of circuit board and module input and output

signals, continuity checking of interconnection circuitry

and controls, and location of alignment controls.

Section Il. TROUBLESHOOTING

5-4. Fault Isolation Procedures

5-3. General

a. General. Fault isolation chart, table 5-1, contains

Troubleshooting of the test set at the General Support

procedures for the localization of faults to the defective

maintenance level consists of the isolation of a fault to a

circuit or component of the test set. Prior to the perfor-

defective cable, front panel control or indicator, circuit

mance of the procedures of table 5 1, a thorough

board, module or assembly. Upon receipt of a faulty test

physical inspection of the test set should be made for

set from the using activity, the reported fault should be

heat damaged or broken cables, front panel components

confirmed by operational testing and/or the perfor-

and wiring, or circuit boards and plug-in components,

mance of the applicable procedures contained in the per-

with special attention given to those items that, upon

formance test of Section IV. If a reported fault cannot be

failure, could possibly cause or contribute to the

confirmed, particular attention should be given to

reported fault. Refer to figure 5 1 for locations or parts

physical inspection of the test set for damage that might

and assemblies, and to the schematic diagram of figure

cause intermittent failure, and those tests applicable to

F0-1 for their interconnection.

the functions that would be affected by the reported

fault should be reperformed.

b. Use of Fault Isolation Chart. Look for a descrip-

NOTE

tion of the reported or observed fault condition in the

Remove power before attempting to dis-

Symptom column of table 5-1 and perform the cor-

assemble TI from case.

responding checks and applicable corrective actions in

the order listed in the Corrective action column.

5-1