International Communications Group, Inc.
User’s Guide and Installation Manual
Sigma
7
Aviation Telephone Handset
Sigma
7
8
April 2006
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
(C) Cleaning
Stray fingerprints, smudges, wire clippings, metal shavings, or other debris on outside surfaces of
the chassis should be removed upon completion of installation or repair work.
If cleaning is necessary, use only mild soap and limit water amount to avoid letting any moisture
reach the internal components.
Lightly moisten a cloth and lightly swab the exterior surface in need of cleaning.
3. Abbreviations and Acronyms
A convenient reference guide to abbreviations, acronyms, and symbols used in the text can be
found in the Glossary at the back of this document. Specialized terms will generally be written out
everywhere in the text to avoid confusion. Standard, well-known electronic terms and circuit signal
names are abbreviated in the text without also being written out.
4. Advisories
WARNING:
Observe standard safety precautions and wear SAFETY
GLASSES AND OTHER proper safety gear to prevent personal
injury during installations.
CAUTION:
TURN OFF POWER BEFORE DISCONNECTING ANY
COMPONENT FROM WIRING. DISCONNECTING THE
COMPONENT WITHOUT TURNING POWER OFF MAY
CAUSE VOLTAGE TRANSIENTS THAT CAN DAMAGE THE
COMPONENT.
CAUTION
:
ELECTRO-STATIC-SENSITIVE DEVICES ARE SUBJECT TO DAMAGE BY
EXCESSIVE LEVELS OF VOLTAGE AND/OR CURRENT, JUST AS ARE
MORE CONVENTIONAL SEMICONDUCTOR DEVICES. HOWEVER, THE
PRECAUTIONS NORMALLY USED TO PROTECT SEMICONDUCTORS
ARE NOT SUFFICIENT FOR THE PROTECTION OF ELECTRO-SENSITIVE
DEVICES BECAUSE OF THEIR VERY HIGH ELECTRICAL RESISTANCE.
THE LOW-ENERGY SOURCE THAT MOST COMMONLY DESTROYS
THESE DEVICES IS THE HUMAN BODY WHICH, IN CONJUNCTION WITH
NONCONDUCTIVE GARMENTS AND FLOOR COVERINGS, GENERATES
AND RETAINS STATIC ELECTRICITY. TO PROTECT ELECTRO-
SENSITIVE DEVICES ADEQUATELY, THE DEVICE AND EVERYTHING
THAT CONTACTS IT MUST BE BROUGHT TO GROUND POTENTIAL BY
PROVIDING A CONDUCTIVE SURFACE AND DISCHARGE PATHS.
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