Before requesting service, please check the following.The unit will not turn on.A function does notwork when the button ispressed.Sound is not produced.Picture does not appearon a TV when thefunction is selected.Remote controller doesnot work,The sound from the left/right channels isreversed.Can't receive radiobroadcasts.There is no sound fromsurround speakers.• Is thepowercord pluggedintotheoutlet?• Is therestaticelectricityJntheair?• Are thespeakersand externalcomponentsconnectedproperly?Is the Mutefunctionon?Is thevolumeset to minimum?Is theSpeakerSizeset incorrectlytoNONE?• Is theexternalcomponentconnectedproperly?Are the batteriesdrained?• Is thedistancebetweenremotecontroland mainunittoo great?Arethe left!rightspeakeror left!rightinput!outputcablesconnectedproperly?Is FMantennaconnectedproperly?• Are thesurroundspeakersconnectedproperly?• Is SURR(surround)incorrectlyset toNONEin the SpeakerSize?• Is surroundmodeset to stereo?• Connectthe powerplugto theoutlet.• Disconnectthe powerplug andconnectit again.• Connectthemcorrectly.• Pressthe MUTEbutton to cancelthefunction.Adjustthevolume.Referto pages35 to selectLARGE,SMALLor YES.• Connectit correctly.• Replacewith newbatteries.• Operateat close distance.• Checkthe left/rightchanneland connectit/them correctly.ggConnecttheantennacorrectly.Ifthe inputstrengthof antennasignalis weak,installthe FMantennain aplacewith good reception.• Referto pages16 ~19 to connect themproperly,• Referto page35 to selectLARGEorSMALL,• Referto pages44 ~ 45 to selectproperSurroundMode,54