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SECTION FOUR — Troubleshooting and servicing theReturning a491 for serviceBefore returning the 491to the factory, to preventdelays it is critical thatyou first obtain a ReturnMaterials Authorization(RMA) number from theNorthstar ServiceDepartment. If the 491was purchased through adealer, call the dealerwith the 491 serialnumber so they can helpyou get an RMA number.The 491’s serial numbercan be found on the labelat the top of the 491.If you have overnight or second-day shipping requirements, before shippingthe 491, please call Northstar for turnaround time, freight charges,and payment arrangements.The 491 should be shipped only in a properly designed carton with packingmaterial. Shipments to the Northstar factory should be made to thefollowing address:NOTE:NorthstarService Department30 Sudbury RoadActon, MA 01720 USAReturn the transducer to its manufacturer, not toNorthstar.Shipments without aproper RMA number willnot be accepted!PAGE 26491 INSTALLATION MANUAL Revision A
APPENDIX A — Technical specificationsTable 8: 491 technical specificationsPerformance characteristicsFrequenciesOutput powerPulse lengthsPulse repetition rateAlarmsUpdate rateZoom modesAuto modesNavigation dataDisplay modes50 and 200 kHz1000 watts with dual-element transducers600 watts with single-element transducers0.1 to 2 ms30 to 600 pulses/minFish, bottom, and temperature10 Hz maximum (depends on water depth)(up to 20Hz when used with the Northstar6000i)Marker, bottom lock, bottom lock/center,bottomFishing or cruisingShown on bottom of screenSingle/dual frequency, split-screen, fourzoom modes, A-ScopePhysical characteristicsDimensionsWeight8.78 x 7.22 x 2.35 inches (including backplate)2 poundsEnvironmental characteristicsTemperatureStandards-25˚C to +60˚C operating temperature-55˚C to +90˚C storage temperatureWaterproof, sealed design meets the following:EN60529 IP65; EN60945 emissions; CEElectrical characteristics8 to 36 VDC, 8 watts, reverse polarity andovervoltage protectionTransducer outputs protected against opencircuit/short circuit491 INSTALLATION MANUAL Revision A PAGE 27
Page 1: 491 ECHO SOUNDERINSTALLATION MANUAL
Page 5 and 6: SECTION ONE — IntroductionWelcome
Page 7 and 8: SECTION TWO — Installing the tran
Page 15 and 16: SECTION THREE — Installing the 49
Page 25 and 26: SECTION FOUR — Troubleshooting an
Page 27 and 28: SECTION FOUR — Troubleshooting an
Page 29: SECTION FOUR — Troubleshooting an
Page 33 and 34: GlossarycavitationThe formation of
Page 35 and 36: IndexAAirmar Technology Corporation
Page 37 and 38: IndexUUpgrades, obtaining software

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