Samsung MX-J730 - Page 5

1.Precaution
5)InsulationResistanceColdCheck:
(1)Withtheunit’sACplugdisconnectedfromtheACsource,connectanelectricaljumperacrossthetwoACprongs.
(2)SetthepowerswitchtoON.(3)MeasuretheresistancebetweentheshortedACplugandanyexposedmetallicparts.
Example:screwheads,metalcabinets,antennaport,etc.Ifanyoftheexposedmetallicpartshasareturnpathtothe
chassis,themeasuredresistanceshouldbebetween1and5.2megohms.Ifthereisnoreturnpath,themeasured
resistanceshouldbe“innite.”Iftheresistanceisoutsidetheselimits,ashockhazardmightexist.SeeFigure1.2
InsulationResistanceTest
Figure1.2InsulationResistanceTest
6)Components,partsandwiringthatappeartohaveoverheatedorthatareotherwisedamagedshouldbereplacedwith
partsthatmeettheoriginalspecications.Alwaysdeterminethecauseofdamageoroverheating,andcorrectany
potentialhazards.
7)Observetheoriginalleaddress,especiallynearthefollowingareas:Antennawiring,sharpedges,andespeciallytheAC
andhighvoltagepowersupplies.Alwaysinspectforpinched,out-of-place,orfrayedwiring.
Donotchangethespacingbetweencomponentsandtheprintedcircuitboard.ChecktheACpowercordfordamage.
Makesurethatnowiresorcomponentstouchthermallyhotparts.
8)ProductSafetyNotice:
Someelectricalandmechanicalpartshavespecialsafety-relatedcharacteristicswhichmightnotbeobviousfromvisual
inspection.Thesesafetyfeaturesandtheprotectiontheygivemightbelostifthereplacementcomponentdiffersfrom
theoriginal—evenifthereplacementisratedforhighervoltage,wattage,etc.
9)Componentsthatarecriticalforsafetyareindicatedinthecircuitdiagrambyshading,
or .Usereplacement
componentsthathavethesameratings,especiallyforameresistanceanddielectricstrengthspecications.A
replacementpartthatdoesnothavethesamesafetycharacteristicsastheoriginalmightcreateshock,reorother
hazards.
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