24AVR 158 TroubleshootingSymptom Cause Solutionunit does not function when Main power switch isturned onno Ac power• ensure that the power cord is plugged into a live Ac•power outletcheck if the Ac outlet is switch-controlled•Front-panel Message display lights, but there's nosound or pictureIntermittent input connection•Mute is on•Volume control is turned down•Secure all input and speaker connections•press Mute button•turn up Volume control•no sound from any speaker; protect messageappears on Message displayAmplifier is in protection mode due to possible short•circuitAmplifier is in protection mode due to internal problems•check all speaker wires at speaker and AVr•connections for crossed wirescontact your local harman kardon service centre•no sound from centre or surround speakers Incorrect surround mode•program material is monophonic•Incorrect speaker configuration•program material is stereo•Select a surround mode other than stereo•Mono programs contain no surround information•check the speaker configuration in the setup menu•the surround decoder may not create centre- or•surround-channel information from nonencoded stereoprogramsunit does not respond to remote control commands weak batteries in remote•AVr not selected•remote sensor is obscured•change batteries in remote•press the Setup/AVr button•ensure that the AVr’s front-panel remote sensor is in•the line of sight of the remoteIntermittent buzzing in tuner local interference• Move the AVr or aerial away from computers,•fluorescent lights, motors or other electrical appliancesunable to activate remote control programming mode Source Selector button is not held for at least 3 seconds• be sure to hold the Source Selector button for at least•3 secondsAdditional information on troubleshooting possible problems with your AVr and installation-related issues may be found in the list of “Frequently Asked Questions,” which is located in the productSupport section of our web site: www.harmankardon.comTroubleshooting