Returning A Circuit Board; Electro-Static Discharge (Esd) - Simrad ES70 - INSTALLATION REV A Installation Manual

Unpacking on board the vessel
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, make sure that you do it
in the instrument room, or at another location where you have a steel deck. Keep far
away from the bridge or any other rooms with wall-to-wall carpets! If possible, bring a
wristband and ground yourself.

Returning a circuit board

If you wish to return a circuit board to us, observe the following rules.
• Place the circuit board to be returned in the same protective plastic bag as you
originally received it in - or a protective bag of similar ESD protection quality.
• DO NOT use standard plastic bags, such as commercial bubble wrap.
• Fill in all the necessary information on the applicable documentation and place it
inside the bag.
• Seal the bag.
• Place the circuit board in a suitable carton, and secure it for shipping.
Note
Failure to follow these rules may result in unserviceable circuit boards.

Electro-Static Discharge (ESD)

What is ESD?
Electro-Static Discharge (ESD) is the transfer of an electrostatic charge between two
bodies at different electrostatic levels, caused either by direct contact or induction by
an electrostatic field. The passing of a charge through an electronic device can cause
localised overheating, and it can also "puncture" insulating layers within the structure of
the device. This may deposit a conductive residue of the vaporised metal on the device,
and thus create a short circuit. This may result in a catastrophic failure, or degraded
performance of the device.
ESD protection
Sensitive electronic circuit boards must be transported and stored in protective packing
bags. The circuit boards must not be transported or stored close to strong electrostatic,
electro-magnetic or radioactive fields.
If it is necessary to open and touch the circuit board inside the protective bag, then
the following precautions must be taken:
1 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.
343522/A
Appendix B Equipment handling
185