Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report. Page: 28 of 66
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Cross Reference Between Locations of Parts and Schematic Symbols. The
method developed for quickly locating a part on an electrical assembly is a
convenient cross-reference from schematic symbol to physical location of
the part. The components are listed by schematic symbol according to type
and numerical order. For example, the resistors are all listed together in
a column starting with R101, proceeding numerically to R102, R103, and so
on. An index number is assigned to each component that is located on the
physical pictorial drawing. The example in Table 1 and Figure 2 gives the
method used for cross reference. CR421 was assigned as the index number
24 in the Location Reference column of Table 1. The number 24 locates
the part on Figure 2.
Waveforms. The reference waveform includes both the normal waveforms
and discrepant waveforms. Simulated faults that did not result in cata-
strophic failures were introduced into the unit. The junctions of a transistor
were opened and shorted, a diode was reversed, capacitors were opened and
shorted, and wrong-value components were sometimes introduced. Reject
data was reviewed to identify the most commonly encountered component
failures. These failures were built into the unit, and pertinent waveform
photographs were made.
The waveforms were strategically taken to convey the proper technique to
the operator. For example, if the best way to check a diode was to measure
the ac drop across it, the waveform was taken with a probe on each side of
the diode and the scope was adjusted to give the difference between the volt-
age at the scope probes or, if the best way to determine proper operation
of a circuit was to view a transient phase relationship, a dual-beam scope
might be specified.
As a result of the study and the development of the prototype manuals, pro-
duction is now using a set of production troubleshooting manuals on
telemetry and other programs.
Engineering technicians are also using the production manuals for engineer-
ing technical work. The Design Agency has ordered and is using a set of
the production manuals as technical aids for technicians assigned to
Significant cost savings have been realized because of this improved effi-
ciency in translating and transferring technical engineering information to
the production troubleshooter and engineering technician level.
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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/m1/28/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.