Simrad SX90 - INSTALLATION REV C - Returning a Circuit Board; What Is ESD

AppendixBEquipmenthandling
Unpackingonboardthevessel
Whenyouareworkingonboardavessel,an“approved
conductiveservicemat”isoftenfaraway.Asyoustillneedto
unpackcircuitboards,makesurethatyoudoitintheinstrument
room,oratanotherlocationwhereyouhaveasteeldeck.Keep
farawayfromthebridgeoranyotherroomswithwall-to-wall
carpets!Ifpossible,bringawristbandandgroundyourself.
Returningacircuitboard
Ifyouwishtoreturnacircuitboardtous,observethefollowing
rules.
•Placethecircuitboardtobereturnedinthesameprotective
plasticbagasyouoriginallyreceiveditin-oraprotectivebag
ofsimilarESDprotectionquality.
•D
O N O T usestandardplasticbags,suchascommercial
bubblewrap.
•Fillinallthenecessaryinformationontheapplicable
documentationandplaceitinsidethebag.
•Sealthebag.
•Placethecircuitboardinasuitablecarton,andsecureitfor
shipping.
Note
Failuretofollowtheserulesmayresultinunserviceablecircuit
boards.
WhatisESD?
Electro-StaticDischarge(ESD)isthetransferofanelectrostatic
chargebetweentwobodiesatdifferentelectrostaticlevels,
causedeitherbydirectcontactorinductionbyanelectrostatic
eld.Thepassingofachargethroughanelectronicdevicecan
causelocalisedoverheating,anditcanalso“puncture”insulating
layerswithinthestructureofthedevice.Thismaydeposita
conductiveresidueofthevaporisedmetalonthedevice,andthus
createashortcircuit.Thismayresultinacatastrophicfailure,or
degradedperformanceofthedevice.
ESDprotection
Sensitiveelectroniccircuitboardsmustbetransportedand
storedinprotectivepackingbags.Thecircuitboardsmust
notbetransportedorstoredclosetostrongelectrostatic,
electro-magneticorradioactiveelds.Ifitisnecessarytoopen
andtouchthecircuitboardinsidetheprotectivebag,thenthe
followingprecautionsmustbetaken:
307531/C
187