Table of Contents
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Model 1317A
Service
SECTION VIII
SCHEMATICS AND TROUBLESHOOTING
8-1.
INTRODUCTION.
8-2. This section contains schematics, repair and re-
lacement information, component locator illustra-
tions, and troubleshooting information. Table 8-1
defines symbols used on the schematics.
8-3.
SCHEMATICS.
8-4. Schematics are printed on foldout pages for
easy reference to the text and figures in other
sections. The schematics are drawn to show the
electronic function of the circuits. Anyone sche-
matic may include all or part of several different
physical assemblies. Non MIL-standard symbols and
conventions used in the schematics are defined in
table 8-1.
8-5. The schematics are numbered in sequence with
a bold number at the lower right-hand corner of each
page. These numbers are used to cross reference
signal connections between the schematics. At each
circuit breaking point, a number in a circle is shown,
followed by another number in bold type. The circled
number indicates the signal or circuit and the bold
number indicates the associated schematic that
contains the source or destination of the signal. To
find the source or destination of the signal, turn to
the indicated schematic and find the circled number
in
question.
8-6. A table on each schematic lists all components
shown on the schematic by reference designation.
Component reference designators that have been
deleted from the schematic are listed below the table.
8-7. All components within the inclosed areas of the
schematic (refer to the first illustration on table
8-1) are physically located on etched circuit board
Components not physically located on etched circuit
boards are shown in the uninclosed areas of the sche-
matic.
8-8.
REFERENCE DESIGNATIONS.
8-9. The unit system of reference designations used
in this manual is in accordance with the provisions of
USA Standard Y32.16-1968, Reference Designations
for Electrical and Electronics Parts and Equipments,
dated March 1, 1968. Minor variations from the
standard, due to design and manufacturing practices,
may be noted.
8-10. Each electrical component is assigned a class
letter and a number. This letter-number combination
is the basic reference designation. Components which
are part of an assembly have, in addition to the basic
designation, a prefix designation indicating the as-
sembly of which the component is a part. For instance
resistor R23 on assembly Al is called AIR23.
8-11. Assemblies are numbered consecutively. If an
assembly reference designation is assigned and later
deleted, that number is not reused.
8-12.
COMPONENT LOCATIONS.
8-13. Locations of components on assemblies and
subassemblies are illustrated adjacent to the sche-
matics. Since the schematics are drawn to shown
function, portions of a particular assembly may ap-
pear on several different schematics. The component-
location illustration is printed next to the schematic
that shows most of the circuitry on the assembly. In
some cases, a particular component-location illustra-
tion may appear adjacent to more than one sche-
matic.
8-14. The locations of all adjustments are shown in
Section V.
8-15.
PREVENTIVE MAINTENANCE.
8-16. Preventive maintenance consists of periodic
performance checks, calibration, mechanical inspec-
tion, cleaning, and other services designed to prevent
breakdown and failure. Performance checks and cali-
bration are covered in Section V of this manual.
The other preventive maintenance services are cover-
ed in the following paragraphs.
8-17.
MECHANICAL INSPECTION.
8-18. Periodically inspect the instrument for dam-
aged components, excess grease, dirt, and corrosion.
Look for loose and misaligned assemblies. Ensure
that all screws and fasteners are tight and
serviceable.
8-19.
CLEANING.
8-20. Painted, glass, and plastic surfaces can be
cleaned with a spray-type, window cleaner or with a
mild soap and water solution. Excess grease can be
removed with a degreaser such as M-180 FREON TF
DEGREASER produced my Miller-Stevenson Com-
pany. Use alcohol to clean plastic CRT Filters.
8-1
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Troubleshooting
