AS 680/682
Description, Operation and Maintenance System Description
ADS−B
1−7Ed. 10.07
1.4 GENERAL SAFETY PRECAUTIONS
1.4.1 Observation of Safety Regulations
The following are general safety precautions that are not related to any specific procedures. These
are recommended precautions that personnel must understand and apply during many phases of
operation and maintenance. Regard also the safety precautions and measures which are contained
in the original technical manuals (COTS) of the individual equipment manufacturer. In addition to the
mentioned instructions for avoiding damage and injury, locally valid safety regulations should always
be observed.
1.4.2 Maintenance Operation at the Device
The primary power supply voltage should always be disconnected by actuating the corresponding
switch (mains and/or DC power) on the equipment concerned before removing a subassembly or a
plug−in connection in order to avoid injury to persons or subsequent damage to devices or subas-
semblies.
1.4.3 Handling Subassemblies
When replacing subassemblies and plug−in cards containing electrostatically sensitive compo-
nents, special precautionary measures should be taken during removal, transport and installation in
order to prevent damage to the components.
PCB’s containing electrostatically sensitive components are marked with this symbol:
Electrostatic damage may be caused when the person performing the subassembly replacement
bears a static charge due to friction with an insulated floor covering or with synthetic articles of cloth-
ing (e.g. soles) and the charge is transferred to the terminals of the MOS components.
In order to avoid this, make positive contact between the system ground and your hand before and
during removal or insertion of the subassembly. Any body charge is then discharged to the system
ground. When the subassembly has been removed, the subassembly should be placed in a special
container or envelope. Use the following procedure and sequence to insert a subassembly:
− Discharge the body by touching the system ground with both hands.
− Remove the subassembly from the special container.
− Remove the short−circuit bar from the subassembly.
− Touch the device ground.
− Insert the subassembly, if possible whilst retaining contact with the device ground.
1.4.4 Using Lithium Batteries
State of the art computer systems may contain Lithium batteries for data backup. These are used in
the AS 680 Signal Processing Unit and in commercial Personal Computers (PC) used for the RCMS
systems. If replacement is necessary, always read the label on the battery. It is recommended to insert
only batteries of the same type according to the recommendations of the manufacturer.
WARNING
Do not recharge, disassemble, heat above 100 °C or incinerate any lithium cell. Do not
short−circuit the cell or solder directly on it. Disregard of the norms regarding the use of
lithium batteries may cause the risk of fire, explosion and the leakage of toxic liquid and
gas. Run−down batteries are objects that can pollute the environment and must be dis-
posed of taking the proper precautions.
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