Mackie SRM450v3 - Service and Troubleshooting Guide; Troubleshooting No Power and No Sound; Addressing Noise and Hum Problems; Repair and Service Information

SRM350v3 and SRM450v3 Powered Loudspeakers
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SRM350v3 and SRM450v3 Powered Loudspeakers
Appendix A: Service Information
Poor sound
• Isitloudanddistorted?Makesurethatyou’renot
  overdrivingastageinthesignalchain.Verifythat
  alllevelcontrolsaresetproperly.
• Istheinputconnectorpluggedcompletelyinto
  thejack?Besureallconnectionsaresecure.
Noise
• Whatisthepositionofthegainknob?Itshould
  beat(ornear)“mic”whenamicisconnected
  andat(ornear)“line”whenaline-levelsignal
  isconnected.Itshouldbe“off”forallunused
  inputs.
• Makesureallconnectionstotheactive 
  loudspeakersaregoodandsound.
• Makesurenoneofthesignalcablesarerouted
  nearACcables,powertransformers,orother
  EMI-inducingdevices.
• IstherealightdimmerorotherSCR-baseddevice
  onthesameACcircuitastheSRMloudspeaker?
  UseanAClinelterorplugtheloudspeakerinto
  adifferentACcircuit.
Hum
• Trydisconnectingthecableconnectedtothemain
  inputjack.Ifthenoisedisappears,itcouldbe
  a“groundloop,”ratherthanaproblemwiththe
  SRMv3loudspeaker.Trysomeofthefollowing
  troubleshootingideas:
• Usebalancedconnectionsthroughoutyoursystem
  forthebestnoiserejection.
• Wheneverpossible,plugalltheaudioequipment’s
  linecordsintooutletswhichshareacommon
  ground.Thedistancebetweentheoutletsandthe
  commongroundshouldbeasshortaspossible.
Repair
Forwarrantyservice,refertothewarranty
informationonpage23.
Non-warrantyserviceisavailableatafactory-
authorizedservicecenter.Tolocatethenearest
servicecenter,visitwww.720trees.com,click“Contact
TechSupport”andselect“LocateaServiceCenter
orDistributor”[3].ServiceforSRMv3loudspeakers
livingoutsidetheUnitedStatescanbeobtained
throughlocaldealersordistributors.
Ifyoudonothaveaccesstoourwebsite,youmaycall
theTechSupportdepartmentat1-800-898-3211,
Monday-Friday,duringnormalbusinesshours,Pacic
Time,toexplaintheproblem.TechSupportwilltellyou
wherethenearestfactory-authorizedservicecenteris
locatedinyourarea.
IfyouthinktheSRMv3loudspeakerhasaproblem,
pleasecheckoutthefollowingtroubleshootingtipsand
doyourbesttoconrmtheproblem.VisittheSupport
sectionofourwebsite(www.720trees.com)whereyou
willndlotsofusefulinformationsuchasFAQsand
otherdocumentation.Youmayndtheanswertothe
problemwithouthavingtopartwithyourloudspeaker.
Troubleshooting
No power
• Ourfavoritequestion:Isitpluggedin?Makesure
  theACoutletislive[checkwithatesterorlamp].
• Ournextfavoritequestion:Isthepowerswitch
  on?Ifnot,tryturningiton.
• IstheLEDonthefrontpanelilluminated?
  Ifnot,makesuretheACoutletislive.
  Ifso,referto“Nosound”below.
• TheinternalAClinefusemaybeblown.Thisis
  notauserserviceablepart.Ifyoususpectthe
  AClinefuseisblown,pleaseseethe"Repair"
  sectionnext.
No sound
• Istheinputgainknobfortheinputsource 
  turnedallthewaydown?Verifythatallthegain
  knobsinthesystemareproperlyadjusted.Look
  atthelevelmetertoensurethatthemixeris
  receivingasignal.
• Isthesignalsourceworking?Makesurethe 
  connectingcablesareingoodrepairandsecurely
  connectedatbothends.Makesuretheoutput
  levelcontrolonthemixingconsoleisturnedup
  sufcientlytodrivetheinputsofthespeaker.
• Makesurethemixerdoesnothaveamuteonora
  processorloopengaged.Ifyoundsomethinglike
  this,makesurethelevelisturneddownbefore
  disengagingtheoffendingswitch.
• Hasitshutdown?Makesurethereisatleast
  sixinchesoffreespacebehindeachSRMv3 
  loudspeaker.
Poor bass performance
• Checkthepolarityoftheconnectionsbetweenthe
  mixerandtheloudspeakers.Youmayhaveyour
  positiveandnegativeconnectionsreversedatone
  endofonecable,causingoneloudspeakertobe
  out-of-phasewiththeother.
• Poorbassperformancemaybetheresultofbad
  ACpower.Seethesectiontitled‘ACPower’on
  page12forfurtherdetails.