28 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook4 Maintenance & Fault Finding4.2 General maintenanceCAUTION:The control unit, fluxgate compass, tiller drive and rudderposition sensor do not contain any user serviceable parts. Theseproducts should be serviced only by authorized Raymarineservice technicians.Wheel driveRoutine maintenanceAfter each trip, flush inside the drive unit by inserting a hose pipein the free slot on the back cover.The autopilot will not ‘talk’ to otherSeaTalk instrumentsCabling problem – make sure all the cables areconnected properly.Position information not received Navigator not transmitting the correct positiondata.The autopilot will not auto advance tothe next waypointNo bearing to waypoint information receivedfrom the navigator.The control unit display shows a seriesof rotating dashesCompass deviation correction is running (seepage 81).The control unit display shows a seriesof stationary dashesThe control unit is not receiving data – check thecabling.The control unit display shows NO DATA The signals received by the navigator are tooweak for reliable navigation – refer to thenavigator handbook for further action.ORWind trim data is not available – check theconnection to the wind instrument.Wheel drive: drive belt slips in Automode (motor operates but drive doesnot turn wheel)Tighten the clutch – seepage 29.Wheel drive: drive belt drags inStandby modeLoosen the clutch – seepage 29.SYMPTOM SOLUTION81131_7.book Page 28 Wednesday, March 17, 2004 3:59 PM
