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SECTION FOUR — Troubleshooting and servicing theGettingtechnicalsupportYou can E-mail theService Departmentdirectly from Northstar’swebsite(www.northstarnav.com).Here, you also canaccess additionaltechnical informationunder either theManuals link (you candownload manuals inPDF form) or Supportlink.After you’ve followed the instructions in this manual, if you need additionaltechnical or operations support for the 491, or if you have anyother service-related questions, you can contact either your dealer or theNorthstar factory. You can reach the Service Department by E-mail, fax,U.S. mail, or phone as described in Table 7 below.NOTE:Please have the following items available when youcontact Northstar.• the 491’s serial number, located on the top ofthe unit• the transducer manufacturer’s name and thetransducer’s model and part numberPlease be as complete and accurate as possible when describing the problemso that a service technician can research the problem and provide thequickest response.The Northstar Service Department is available between 9:00 AM and 5:00PM Eastern Time, Monday through Friday, excluding major holidays.If you have questions about purchasing parts or finding an authorizedNorthstar dealer, or if you want basic product information and brochures,contact the Northstar Sales Department as described in the table below.Table 7: Contacting NorthstarEmail:Service: service@northstarnav.comSales: sales@northstarnav.comFax:Service: 978/897-1595Sales: 978/897-7241Telephone:Main number: 978/897-6600 or 800/628-4487Sales: 978/897-0770Service: 978/897-6600U.S. mail:Northstar30 Sudbury RoadActon, MA 01720Website:www.northstarnav.com (you can send E-mailto Northstar directly from this site)PAGE 24491 INSTALLATION MANUAL Revision A
SECTION FOUR — Troubleshooting and servicing theHearing from youYour feedback is important and helps Northstar ensure that this manualis a valuable resource for all marine technicians. Send your questions,comments, or suggestions about this manual to:docs@northstarcmc.comOrderingreplacementpartsTo order spare parts or replacement/missing parts, call the Sales Departmentat 978/897-0770.Servicing the491Repair of the 491 is performed only at the factory. Service includes a completehardware and software check-out.NOTE:Field repairs are not authorized and will void thewarranty!For transducer service, including parts and repairs,please contact the transducer manufacturer.The 491 and any accessories returned for warranty repair that are determinedto be without fault are subject to a handling charge.491 INSTALLATION MANUAL Revision A PAGE 25
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: SECTION FOUR — Troubleshooting an
Page 31 and 32: APPENDIX A — Technical specificat
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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