Jensen 400 Installation & Operation Manual

Contents

Jensen 400 Installation & Operation Manual Manual pdf 13 page image

POWER Amplifiers12TroubleshootingNOTE: If the protection light is activated with no speakers connected tothe amplifier, and all the power connections are correct, this wouldindicate an internal problem with the amplifier.Problem Possible Cause Corrective ActionAmplifier does notturn onNo power to +12VterminalCheck fuse(s)No power to REMterminalCheck head unit fuse(s) andwiringBlown main fuse atbatteryReplace fuse and identifycause of failureBlown fuse at amplifier Replace fuse and identifycause of failureFaulty ground Re-ground main powerground to bare metalchassisVolume control toosensitiveInput level controladjusted too highRe-adjust the input level(refer to page 8)Distorted sound Input level controladjusted too highRe-adjust the input level(refer to page 8)Blows fuse(s) at amp Power wires connectedbackwardsReconnect power wiresproperlyInternal problem withampTake unit for serviceEngine noise /Alternator whineGround loop(s) Use good quality shieldedRCA cablesFaulty ground at amp Re-ground amp to cleanbare metal chassisFaulty ground at headunitRe-ground head unit toclean bare metal chassisInductive coupling Re-route RCA and/orspeaker wires away fromfactory harnessesInput level on amp settoo highRe-adjust input level (referto page 8)Thermal protectionactivatedAmplifier driving 2 ohmload for long durationsIf the amplifier “thermals”frequently while drivingsubwoofers, install fan tokeep amp cool.Short circuitprotection activatedBlown speakers Check all speakersSpeaker wire(s) shortingto groundCheck for faulty wiringDefective crossover Faulty passive crossoverLow impedanceprotection activatedAmp connected toimproper loadCheck speaker connectionsAmp will not drive a 1ohm mono load, 2 ohmminimum in monoconfigurationVerify that speakers areconnected properlySpeakers defective/blownCheck speakersFaulty passivecrossoversCheck crossoversPoor bass response Speakers out of phase Check speaker polarity;reverse the connection toone speaker only if twosubwoofers are connectedto the amplifier.

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