Kongsberg EM 2040 MKII, Руководство по установке

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231
Unpacking and handling printed circuit boards and electronic modules, page 231
Returning a printed circuit board or an electronic module to Kongsberg Maritime,
page 232
About Electrostatic Discharge (ESD), page 234
Unpacking and handling printed circuit boards and electronic
modules
Circuit boards and electronic modules are delicate items. They may work year after
year in an advanced product, but then fail due to a small spark of static electricity. For
this reason, it is very important that they are properly unpacked and handled, and then
well protected during all handling.
Prerequisites
For correct and safe handling of printed circuit boards and electronic modules, you need
a suitable working area. The working area must be covered by an approved conductive
service mat that has a resistance of between 50 kΩ and 2 MΩ, and is connected directly
to a reliable earth point via its earthing cord. You - and all other service personnel
involved - must wear a wristband in direct contact with the skin. The wristband must be
electrically connected to the service mat..
Sensitive printed circuit boards and electronic modules must always be transported
and stored in protective antistatic packing bags. It as also important that they are not
transported or stored close to strong electrostatic, electromagnetic or radioactive fields.
Context
Beware of Electrostatic Discharge (ESD)!
When you handle electronic circuit boards and modules, you must beware of the dangers
of electrostatic discharge (ESD), both to yourself and to the equipment. In order to
ensure safe transport and storage, circuit boards and other electronic units will always be
wrapped in a clear plastic protective bag, and the bag will be sealed.
Note
Failure to follow these rules may result in an unserviceable circuit board or module.
Procedure
1 Prepare a suitable workbench with a conductive service mat.
Make sure that you wear a grounded wristband with direct contact with the skin.
When you are working on board a vessel, an "approved conductive service mat" is
often far away. As you still need to unpack circuit boards and modules, make sure
that you do it in the instrument room, or in another location with a steel deck. Keep
Equipment handling