JBL GX-A604 Service Manual

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troubleshootinG
If your amplifier isn’t performing the way you think is should, check to see if the problem is covered in this section before calling your dealer or
contacting JBL customer service.
PROBLEM CAUSES AND SOLUTIONS
Nosound(theamplifier’sPowerLEDisoff) • Checkthattheamplifier’s+12VandGNDconnectionshavebeenproperlymade.
• Checkifthefuseonthe+12Vwirelocatednearthebatteryisblown:Ifso,replaceitwithan
identical fuse.
• Checkallamplifierfuses;ifanyareblown,replacethemwithidenticalfuses.
• Ifyouareusingtheamplifier’sREMconnectionforturn-on,checkthatthewireisproperly
connectedtotheaudiosystem’sremoteturn-onwireortothevehicle’sACCpowerterminal.
Nosound(theamplifier’sPowerLEDisorange) •Checkthatallamplifierinputandspeakerconnectionshavebeenproperlymade.
• Checkthattheamplifier’sLevelcontrolsarenotturnedallthewaydown(counter-clockwise).
• Checkthatthevehicleaudiosystem’ssourceunit’svolumecontrolisnotturnedalltheway
down.
Nosound(theamplifier’sProtectionLEDisred) •Confirmthatthevehicle’selectricalsystemissupplyingbetween9Vand16VDCtothe
amplifier. If the supply voltage is outside of this range, correct the condition before attempting to
use the amplifier.
• Iftheamplifierhasoverheated,waituntilithascooleddownbeforeattemptingtouseitagain.
• Disconnectallspeakersfromtheamplifierandattempttoturnitonagain:
– Iftheamplifierturnson(thePowerLEDisorange),thereisashortcircuitinoneormoreofthe
speakerwires.Correctallshortcircuitsbeforereconnectingthespeakerstotheamplifier.
– Iftheamplifierdoesnotturnon(theProtectionLEDisstillredandthePowerLEDisoff),
contact your authorized JBL dealer for assistance.

JBL GX-A604 Specifications

General

Signal-to-Noise Ratio (SNR)	93 dB
Number of amplifier channels	4 channels
Frequency response	20 Hz