Diagnosis of Malfunctions in Complex Electronic Assemblies. Final Report. Page: 64 of 66
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" The fault may be lost during handling or disassembly as a result' of re-
moving an interconnection fault, removing a piece of foreign material,
or relieving a pinched-wire condition.
Since faults falling in the last two categories must be isolated to assure.
high reliability requirements, strict accountability procedures are required
by specifications to provide a logical explanation for each failure,' a limit
on the time required for completing the verification of the original failure,
and to identify the associated lower assembly and component faults causing
the failure. Violations of this requirement cause delays in factory output
because of the time required for engineering disposition and the special,
handling required to clear the failure.
Some of the areas affecting the capabilities of the factory to meet the time'
limit requirement on completing a diagnostic attempt are listed below:
" Failure to identify units in the pipe-line according to date rejected;
e Lack of a suitable method for expedient daily inventory of units in the
rework and troubleshooting pipe line; and
e Failure to identify the status of all assemblies associated with the same
An inventory of units by date of rejection, calculation of the percentage of
successful diagnoses by each operator, and the daily status of units in rework
with troubleshooting, verification, and stamp removal notations would pro-
vide very beneficial information for the troubleshooting foreman to aid in
planning priorities and keeping informed of employee performance. An out-
line plan to computerize this approach was prepared and submitted to
programming for a feasibility study. The plan included installation of a
remote computer .substation in the production area so that KCD 413 produc-
tion test data can be routed directly to the central computer system. This
plan should become feasible when the present computer facilities expansion
When disassembly of the product is necessary to allow diagnostic effort to
continue, routing methods can cause discontinuities in the diagnostic effort.
The rejected unit may not return to the troubleshooting stations for several
shifts after the request for disassembly, and there is no assurance that the
unit will be returned to the same shift or to the operator that started the
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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/m1/64/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.