Samsung DA-E750 - Servicing Precautions

1.Precaution
1.2.ServicingPrecautions
1)Servicingprecautionsareprintedonthecabinet.Followthem.
2)Alwaysunplugtheunit’sACpowercordfromtheACpowersourcebeforeattemptingto:(a)Removeorreinstallany
componentorassembly,(b)Disconnectanelectricalplugorconnector,(c)Connectatestcomponentinparallelwith
anelectrolyticcapacitor.
3)Somecomponentsareraisedabovetheprintedcircuitboardforsafety.Aninsulationtubeortapeissometimesused.
Theinternalwiringmaybeclampedtopreventcontactwiththermallyhotcomponents.Reinstallallsuchelements
totheiroriginalposition.
4)Afterservicing,alwayscheckthatthescrews,componentsandwiringhavebeencorrectlyreinstalled.
Makesurethattheportionaroundtheservicedparthasnotbeendamaged.
5)ChecktheinsulationbetweenthebladesoftheACplugandaccessibleconductiveparts(examples:metalpanels,
inputterminalsandearphonejacks).
6)InsulationCheckingProcedure:DisconnectthepowercordfromtheACsource.Connectaninsulationresistance
meter(500V)tothebladesoftheACplug.
TheinsulationresistancebetweeneachbladeoftheACplugandaccessibleconductiveparts(seeabove)shouldbe
greaterthan1megohm.
7)NeverdefeatanyoftheB+voltageinterlocks.DonotapplyACpowertotheunit(oranyofitsassemblies)unlessall
solid-stateheatsinksarecorrectlyinstalled.
8)Alwaysconnectatestinstrument’sgroundleadtotheinstrumentchassisgroundbeforeconnectingthepositivelead;
alwaysremovetheinstrument’sgroundleadlast.
CAUTION
Firstreadthe“SafetyPrecautions”sectionofthismanual.Ifsomeunforeseencircumstancecreatesaconictbetweenthe
servicingandsafetyprecautions,alwaysfollowthesafetyprecautions.
1-3Copyright©1995-2012SAMSUNG.Allrightsreserved.