Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report. Page: 19 of 66
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open setup equipment and, on the other end, unskilled workers using
computer-type analysis equipment and cookbook-type instructions.
This development approach was to first define an adequate operator skill
level and to design and develop equipment, methods of communicating engi-
neering technical information to the troubleshooter, and troubleshooting
procedures that would be compatible with this skill level. The general work
plan, divided into two phases, is listed below.
" Phase 1: The objectives were to define and develop methods to assure
an adequate diagnostician skill level and to develop an effective means
of communicating engineering diagnostic support information to the
" .Phase 2: The objectives were to define the type of diagnostic equipment
necessary for accurate and efficient fault diagnosis and to develop diag-
nostic procedures for difficult troubleshooting areas.
Phase 1 Development
Defining the Operator Skill Level
The following areas were considered in a study designed to define an ade-
quate troubleshooting level:
" Problem complexity;
" Reducing troubleshooter skill level with automatic diagnostic techniques;
" The requirements placed on the troubleshooter by possible hidden or
potential field failures not detected by inspection testing;
" The skill level requirements of the troubleshooting supervisor; and
" The skill level necessary to interpret engineering support material.
Problem Complexity. The complexity of the diagnostic problems evaluated
varied over a wide range. Some of the problems encountered were complex
enough to require the skill of a design engineer, and required several hours
of evaluation before the fault definition was complete; however, most solu-
tions required a skill well below this level.
The more complex problems usually were associated with such things as
marginal tolerance build-up in components, and spurious responses or cross-
talk resulting from stray circuit capacities or radiation; however, wiring
errors sometimes caused very complex effects. It is difficult to assign a
quantitative value to the complexity of these technical problems, but general
categories of troubleshooting problems did display various degrees of
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Losure, J. A. Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report., report, January 1, 1971; Kansas City, Missouri. (https://digital.library.unt.edu/ark:/67531/metadc1031893/m1/19/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.