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TM 11-5820-890-20-2
1-50
1.20.
TROUBLESHOOTING. Continued
Connector. Directs user to an entry point on another sheet in the same chart. Contains an entry
number and sheet number that are the same as the entry number and sheet number found on another
sheet in the same chart.
2
SH 4
Notes Column. Presents critical information. States cautions and warnings that must be observed
when doing a test. Has additional data as to what to do or where to go after that step in the testing.
Provides references to appropriate circuit diagrams.
Connector Illustrations. Front views of connectors are placed accordingly to give the maintainer a
visual reference when measuring resistances between pins.
Helpful Hints. When taking measurements, remember that a connector's pin numbers are mirror
images of those on the connector from which it was removed. Whenever possible, use a chassis ground
instead of a pin ground. This will allow you greater flexibility when taking measurements and can prevent
shorting the equipment.
1.21.
POST REPAIR USE OF OPERATIONAL CHECK.
When the faulty LRU has been found, inspected, and replaced, repeat the operational check to ensure that the
system is in fact operational.
1.22.
OPERATION IN THE NUCLEAR, BIOLOGICAL, AND CHEMICAL (NBC)
ENVIRONMENT.
The RT 1523 series is designed to be used in NBC warfare. This radio has been nuclear hardened and is
protected against electromagnetic pulses (EMP) and electromagnetic interference (EMI). The radio has such
features as transient suppressors to protect against transient radiation effects on electronics (TREE) and
nuclear hardened cables to protect against EMP. This requires special attention to maintenance procedures. All
hardness critical processes are marked with the symbol HCP . Each maintenance procedure so marked is a
critical maintenance procedure that shall be performed exactly as written. Failure to do each step as it is written
jeopardizes the nuclear survivability of the equipment.
CAUTION
HCP Use only the cables issued with the Installation Kit. They are nuclear hardened. Using any
other type cable will reduce the radio's ability to survive in a nuclear environment.
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