| SYMPTOM | POSSIBLE REASON | POSSIBLE SOLUTION |
PowerLEDdoesnot glow.Nosound
PowerLEDglows,butno sound
Onechannelnotproduc ingsound
Humfromallspeakers atanyvolume
Humfromallspeakers (humgoesupordown withvolume)
Humfromtheamplifier itself
ACPowerCord(s)notpluggedin.AC
Fuse(s)failed.Transformerthermalprotec
tionengaged.I2VDCtriggeringmalfunc
tioning.
Preamporsourceunitisnoton.Connec
tionsinrearofampareloose.
INPUT(s)orOUTPUT(s)connectordiscon
nectedorloose.Speakerdisconnected.
Internalprotectionengaged.
Groundloop(differenceingroundvoltages betweencomponents).
Problemwithsourceunit(CD,tape,etc.), orRCAcableconnectingthatsourceunitto thepreamp.
Somemajorappliance,dimmer,halogenor
fluorescentlightiscreatinginterference.
PluginACPowerCord(s).ReplaceAC Fuse(s).Waituntilunitcoolsdown.Itwill reset.Resetpowerswitchmanually. Checkconnectionof12VDCtriggerat source.
Makesurewholesystemison.Verifyall
connectionsonrearofamp.
Verifybothconnectionsonthatchannel.
Verifyconnectionatspeaker.Bringto
DealerorServiceCenter.
IfCableTVispresent(seeNote1).IfCa bleTVisnotpresent(seeNote2).
Trydifferentsource(tuner,tape,etc.)
and/ordifferentRCAcable.
Makesureallappliances,dimmersand
suspectlightsareoff.
Troubleshooting
Usethetroubleshootingnotesabovetosolvecommon sit
uationsthatdon’trequireprofessionalattention.If the
stepsstatedinpossiblesolutiondonotresolveyour prob
lem,thenpleasecontactyourADCOMdealerorcall the ADCOMcustomerservicedepartment.Anyproblemsnot
coveredhereshouldbebroughttotheattentionof your ADCOMdealerorADCOMcustomerservicedepartment.
A special note on “hum:”Whenthereisalowvolume “hum”audiblethroughoutyourspeakers,evenwiththe
mainvolumeturnedallthewaydown,youhaveacom mon
phenomenonknownasa“groundloop.”Agroundloop is
basicallyadifferenceingroundvoltagesbetweentw oor morecomponentswhichareconnectedelectricallyand whichcreatesmultiplecurrentpathswheretheremust
onlybeone.Thisdifferenceinpotentialscreatesa6 0Hz
lowlevelsound(approximatelyalowA),thatseems tobe a“hum.”
Humcanbecausedbyaddingnewcomponentstoyour
system,butthatdoesnotimplythereisanythingelect ri
callywrongwithanynewcomponent.Withtheadvent of audio/videoandhometheatersystems,theproblemhas
becomecommonplace.Generally,thecauseistheCab le
TVincomingsignalline.Thisnewincominglinemay add
anadditionalgroundatadifferentpotentialtoth eAC
linegroundofyourotherequipment(refertonote Iand 2,totroubleshootahumproblem).
Note 1:CableTVsystemscansometimescontributeto |
|
groundloopproblemswhichcause“hum.”Todetermine | if |
your cablesystemisthecontributingfactor,disconnectt | he |
CableTVincomingsignalline(round,75)atthewa ll,
orthefirstcomponentthecableisconnectedto(i. e.the
cablebox,orVCR).Ifthehumisnolongerpresent, you mustinserta“75groundloopisolator”beforerecon
nectingtheline.YoushouldcheckwithyourADCOMd eal
ertoobtainone.Ifthe“75groundloopisolator” works
onlypartiallyornotatall,thenpleasereadnote 2to completethetroubleshootingprocedure.
Note 2:Makesurethatthepoweramplifierisatleast6” fromprocessororotherequipmentusingmicroprocessor s.
Usuallyputtinganothercomponentbetweenthemissu f
ficienttominimizethehum.Ifthisdoesnotreduce the
hum,turnthesystemoffanddisconnectallInputsfr om
theamplifier.Ifthehumstillpersists,thenyourdea leror
servicecentermustexaminetheunit/system.Ifthehu m disappears,tryanothersetofRCAcables.Connectone
RCAcableatatimetoseeifonespecificcableis respon
sible.Ifanyorallcablescausethehumtoappear, then
theunitshouldbeevaluatedforproperoperationby your dealerorauthorizedservicecenter.P leaseseeourwebsite
foralistofauthorizedservicecentersinyourarea .
Servicing
ADCOMhasatechnicalservicedepartmenttoanswer |
|
questionspertinenttotheinstallationandoperatio | nof |
yourunit.Intheeventofdifficulty,pleasecontac | tusfor |
advice.Ifyourproblemcannotberesolvedthrougho | ur |
combinedefforts,wemayreferyoutoanauthorized | re |
pairagency,orauthorizereturnoftheunittoour | facto ry. |
