TM 11-6625-2946-14/TM 08168A-14/1
CHAPTER
5
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
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
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
