Mackie DLM12 [19/29] Appendix a service information
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Mackie DLM12 [19/29] Appendix a service information

Mackie DLM12 [19/29] Appendix a service information
Owner’s Manual
19
Owner’s Manual
Appendix A: Service Information
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
thepreviouspageforfurtherdetails.
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mic/lineswitch?
ItshouldbeINwhenamicisconnectedand
OUTwhenaline-levelsignalisconnectedto
thechannel1input.
• 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DLM8/12?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
DLM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.
IfyouthinkyourMackieproduct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.mackie.com/support)
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sendyourMackie
productaway.
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powerLEDonthefrontpanelglowing
green?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levelcontrolfortheinputsource
turnedallthewaydown?Verifythatallthelevel
controls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DLM
loudspeaker.

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