JBL GX-A604 Manuel utilisateur

Service Manual

GX-A604

435-Watt full range 4-channel car power amplifier

Released EU2015 Harman Consumer Group, Inc. Rev 0, 00/20XX

8500 Balboa Boulevard

Northridge, California 91329

OWNER’S MANUAL 2

TROUBLESHOOTING 9

TECHNICAL SPECIFICATIONS 11

PACKING LIST 12

BLOCK DIAGRAM 13

SCHEMATIC DIAGRAMS 14

CONTENTS

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English

ground (gnd) connectIon

Connectawire(minimum10AWG–5.3mm2)

from the amplifier’s GND terminal directly to a

solid point on the vehicle’s chassis.

• Foragoodconnection,usesandpapertoclear

the paint from the metal surface at this chassis

location. Use a star-type lock washer to secure

the wire’s connection.

poWer (12 V) connectIon

1. Connectawire(minimum10AWG–5.3mm2)

directlytothebattery’spositive(+)terminal.

2. Installafuseholderfora50Afuse(GX-A604,

GX-A3001)ora30Afuse(GX-A602)onthis

wirewithin18"(46cm)ofthebattery’s(+)

terminal. Do not install the fuse in the holder

at this time.

3. Route this wire to the amplifier’s location and

connectittotheamplifier’s+12Vterminal.

Be sure to use appropriate grommets

whenever routing wires through the firewall

or other sheet metal. IMPORTANT: Failure

to adequately protect the positive wire from

potential damage may result in a vehicle fire.

4. Whenyouarefinishedroutingandconnecting

this wire, install the appropriate fuse in the

holder you installed near the battery.

(GX-A604,GX-A3001–50Afuse;

GX-A602–30Afuse)

Power

Connectors

Audio System

Head Unit

Chassis Ground

(bare metal)

50 A Fuse (GX-A604/GX-A3001)

30 A Fuse (GX-A602) 18" (46 cm)

Remote Turn-On

(optional)

>#18 AWG (0.82 mm2) Wire

>#10 AWG (5.26 mm2) Wire

speAker And input connections

Alwaysconnectthe(+)speakerterminalontheampliertothe(+)terminalonthespeakerandthe(–)speakerterminalontheampliertothe(–)terminal

on the speaker.

IMPORTANT:Makesurethe(+)and(–)barewiresdonottoucheachotherortheotherterminalatboththeamplifierterminalsandspeaker

terminals. Touching wires can cause a short circuit that can damage the amplifier.

gX-a604 speaker connectIons: 4-channel operatIon

Minimum speaker impedance: 2 ohms (each)

• ConnectthefrontspeakerstotheFLandFR(+)and(–)terminals.

• ConnecttherearspeakerstotheRLandRR(+)and(–)terminals.

Speaker Fuses 20A

Front Left Speaker

Rear Left Speaker

Front Right Speaker

Rear Right Speaker

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English

gX-a604 Input connectIons: 4-channel operatIon

Connectyoursourceunitorprocessor’sfrontandrearleftandrightoutputstotheamplifier’sinputsasshownintheillustration.

Source Unit

Front Line Outputs

Rear Line Outputs

See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor4-channeloperation.

To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.

gX-a604 speaker connectIons: 3-channel operatIon

Minimum speaker impedance: 2 ohms each (left & right speakers); 4 ohms (subwoofer)

•ConnecttheleftandrightspeakerstotheFLandFR(+)and(–)terminals

•ConnectthesubwoofertotheRL(+)andRR(–)terminals.(Therear-channelBassBoostcontrolmakestherearchannelspreferableforsubwoofer

connection. See Set The Bass Boost, on page 23.) NOTE: You can connect two 2-ohm subwoofers in series to maintain the required 4-ohm

mimimum impedance for the subwoofer channel.

Speaker Fuses 20A

Front Left Speaker Front Right Speaker

Subwoofer

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English

gX-a604 Input connectIons: 3-channel operatIon

Connectyoursourceunitorprocessor’slineoutputsasshownintheillustrationbelow.Settheinputmodeswitchinthe"4CH"position

NOTE: Usea"Y"-adaptertoconnectthesourceunit’ssubwooferoutputtotheamplifier’srearleftandrightinputjacks.

Source Unit

Front Line Outputs

"Y"-Adapter

Subwoofer Line Output

See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor3-channeloperation.

To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.

gX-a604 speaker connectIons: 2-channel operatIon

Minimum speaker impedance: 4 ohms (each)

Connecttheleftandrightspeakersasshownintheillustrationbelow.

Speaker Fuses 20A

Left Speaker Right Speaker

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English

gX-a604 Input connectIons: 2-channel operatIon

Connectyoursourceunitorprocessor’slineoutputsasshownintheillustrationbelow.Useonlythefrontleftandrightinputconnectionsandmake

surethattheInputModeswitchissetinthe"2CH"position.

Source Unit

Front Line Outputs

See Set The Crossover Controls, onpage20,forinformationaboutsettingtheamplifier’scontrolsfor2-channeloperation.

To use the speaker-level inputs instead of the line-level inputs, see Using The Speaker-Level Inputs, on page 12.

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.

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English

PROBLEM CAUSES AND SOLUTIONS

Sound only comes from some of the speakers

connected to the amplifier

• Checkthatthevehicleaudiosystem’ssourceunit’sbalanceandfadercontrolsaresettotheir

center (midpoint) positions.

• (GX-A604):Checkthatthesettingoftheamplifier’sModeSwitchmatchestheinputandspeaker

connections made to the amplifier

Sound is too quiet, even with the vehicle audio

system’s source unit volume all the way up

• Checkthattheamplifier’sLevelcontrolsarenotturnedtoolow.SeeSet The Input Level, on

page 22, for information about setting the Level controls.

Sound in the front/rear speakers is distorted • Makesuretheamplifier’sCrossoverFilterswitchforthedistortedchannelsissettoHP.

• SettheCrossovercontrolforthedistortedchannelstoahighersetting.

• Checkthatthedistortionisnotoriginatingfromthevehicleaudiosystem’ssourceunit.

Sound in the subwoofer is distorted • (GX-A604,GX-A602):SettheBassBoostswitchto"OFF".

• (GX-A3001):Whilelisteningtobass-heavymusic,turntheBassBoostcontrolallthewaydown,

and then gradually increase it until the distortion begins to return. Reduce the Bass Boost

control setting slightly to eliminate the distortion and leave it set there.

• Checkthatthedistortionisnotoriginatingfromthevehicleaudiosystem’ssourceunit.

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