MIL-DTL-24784 / 21B (SH)
troubleshooting. The text shall refer to and support the Chapter 5 functional troubleshooting
diagrams. The descriptions shall be presented in successive levels of increasing detail as follows:
a. Overall level (level 1). The text shall support and refer to the overall functional block diagram
(see 3.5.1.1 3 and MIL-DTL-24784). All major functions such as transmit, receive, control,
display, power distribution, cooling, and so forth shall be described at this level.
b. Major function level (level 2). Describe the development of each major function at the level
of detail shown on its related signal flow diagram, logic diagram, or other diagram included in
Chapter 5. The text shall support and refer directly to the diagrams.
c. Circuit level (level 3). Briefly describe conventional electronic circuits found in NAVSEA
SE000-01-IMB-010; refer to the maintenance schematic diagrams in Chapter 5. Describe in
detail circuits not covered in NAVSEA SE000-01-IMB-010; support these circuits by
simplified schematic diagrams (see 3.5.1.3 and MIL-DTL-24784). Describe alternating current
(ac) and direct current (dc) power distribution in detail; support the descriptions by reference to
the power distribution diagrams in Chapter 5. Describe mechanical devices, cooling systems,
and so forth; support the descriptions by reference to mechanical schematic, overall and
functional block diagrams.
3.6.4.2 Integrated circuits and micro-miniature capsules. Simplified schematics in accordance
with NAVSEA SE000-01-IMB-010 or logic diagrams showing input and output connections,
truth tables, and wave forms as applicable, supported by a brief description of overall functional
operation, shall be included for circuits within different types of nonrepairable integrated circuits
and micro miniature capsules. Nonrepairable circuits are not required for functional
understandings of theory of operation. Manufacturer's data sheet information may also be
included if it contains the technical contents of this requirement and meets the format and
legibility requirements of this specification.
3.6.4.3 Digital equipment. The functional description of digital equipment shall be similar to
that for conventional equipment. However, the functional and hardware makeup of digital
equipment requires a variation in the method of presentation and descriptive requirements.
Special considerations relative to the functional description of digital equipment are specified
herein.
3.6.4.3.1 Method of presentation. An overall description of the functional relationship of the
logic sections, units, and assemblies comprising the equipment shall be provided. The following
shall be included:
a.
An introduction to, and description of the signal characteristics:
1.
Signal levels or bi-stable states utilized by the equipment; that is, true (1) and false (0),
and their relative voltage levels.
2.
Interpretation of the word-code bit structure; that is , address, instruction, or data bit
codes.
3.
Signals, identified by their operational accomplishment.
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