Dual XPA4640 Stereo Amplifier User Manual


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Dual Electronics Corp.
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©2008DualElectronicsCorp.
NSA0608-V01
XPA SERIES OPERATION
Troubleshooting
Problem Cause Action
Unit will not turn on
(no power LED indicator)
+12Vwirenotconnectedorincorrectvoltage
REMwirenotconnectedorincorrectvoltage
Checkconnectionsforpropervoltage
(11~16VDC)
GNDwirenotconnected Checkconnectiontoground
Fuse(s)blown Replacefuse(s)
Unit has power - LED is 
green (but no sound)
Speakerwiresnotconnected Checkconnectionsatspeakers
Volumeturnedallthewaydown Increasevolumelevelatheadunit
Oneormorespeakerwirestouchingeach
other or touching chassis ground
Insulateallbarespeakerwiresfromeach
other and chassis ground
Speaker(s)defectiveordamaged Check/replacespeaker(s)
Inputsignalnotconnected Checkhighorlowlevelinputsforproper
connection
Unit blows fuse(s)
Incorrectfuserating Usefuse(s)withcorrectrating
+12Vwiretouchingchassisground Checkforpinchedwire
Speaker(s)defectiveordamaged Check/replacespeaker(s)
Engine noise
Badgroundconnection Makesureamplifierisgroundedtoclean
bare metal
SignalgroundlooporRFI(radiofrequency
interference)
Re-routeRCAcablesfromexistinghigh
currentwiring
LED illuminates red
(protect mode)
Oneormorespeakerwirestouchingeach
other or touching chassis ground
Insulateallbarespeakerwiresfromeach
other and chassis ground
Speaker(s)defectiveor
damagedinternally(shorted)
Check/replacespeaker(s)
Speakerloadlessthan2ohms(stereo)
Speakerloadlessthan4ohms(bridged)
Adjustspeakerload-amplifierwillnot
operateatlessthan4ohmswhenbridged
Distorted audio output
Incorrectinputsignaltypeor
inputleveltoohigh
Checkconnectionsandreduce/adjustinput
level
Low audio output
Incorrectinputsignaltypeor
inputleveltoolow
Checkconnectionsandincrease/adjust
inputlevel
Weak bass
Speaker(s)arewiredoutofphase Check(+)and(-)speakerconnections
(Observecorrectpolarity)
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