Furuno 821, 841 manual Display Unit Installation

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5.2 Display Unit Installation

Mounting considerations

When selecting a mounting location for the display unit keep in mind the following points.

The display unit is designed and con- structed to be splashproof, thus it can be installed outdoors. You can even hose it down after a day’s outing. If it is to be installed outdoors, we recommend install- ing it an enclosed cabinet, for maximum protection against the marine environ- ment.

The temperature and humidity of the mounting location should be stable and moderate. No LCD can provide adequate contrast if the ambient temperature is too extreme.

The display unit consumes only a mod- erate amount of power, so there is no need for forced air ventilation. However, you should provide adequate space behind and around the unit to permit circulation of air and to provide convenient access to the rear connectors.

Even though the picture is quite legible even in bright sunlight, keep the display unit out of direct sunlight or at least shaded because of heat that can build up inside the cabinet.

Locate the display unit in a position where you can view and operate it conveniently but where there is no danger of salt or fresh water spray or immersion.

The orientation of the display unit should be so the radar screen is viewed while the operator is facing in the direction of the bow. This makes determination of your position much easier.

Make sure you allow enough clearance both to get to the connectors behind the unit and to allow you to get your hands in on both sides to loosen or tighten the mounting knobs. Make sure you leave at least a foot or so of “service loop” of cables behind the unit so it can be pulled forward for servicing or easy removal of the connectors.

A magnetic compass will be affected if placed too close to the display unit. Ob- serve the minimum compass safe dis- tances to prevent deviation of a magnetic compass: standard compass, 0.7 meters, and steering compass, 0.5 meters.

Mounting procedure

The display unit is designed to be mounted on a tabletop.

1)Using the hanger as a template, mark screw locations in the mounting location.

2)Fix the hanger to the mounting location with four M6 tapping screws (supplied).

3)Fit the knob bolts to the display unit.

4)Install the display unit in the hanger.

5)Tighten the knob bolts securely.

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Contents Marine Radar First Edition AUG Useable Environment Safety ArrangementsElectrical Shock Hazard Ground both the Display Unit and the Antenna UnitTable of Contents Foreword FeaturesDisplay Unit SPECIFICATIONS- ModelAntenna Unit Transceiver Module contained in radomeVibration Power supply & power consumptionProtection features Warm-up time Modulator switching methodReceiver front end MIC Michoeave IC Bandwidth 7 MHz Duplexer Ambiont temperatureInterface Nmea Model 821/841 Page Model 821/841 ConfigurationPrinciple of Operation How radar works Control Description OperationTurning the Radar On Off Display Indications and MarkersSelecting the Range Adjusting LCD Backlighting and Display ToneAdjusting Control Panel Brilliance TransmittingSTC MAN Auto Adjusting GAIN, STC, A/C Rain and FTCHow to tune manually Tuning the ReceiverAdjusting A/C Rain Adjusting FTCMeasuring the Bearing Measuring the RangeTarget on collision course with your vessel? Menu OperationMenu description 11 Display modes Selecting the Display ModeCU course-up Selecting the Presentation ModeWindow Display WPT-UP waypoint-up Guard AlarmGuard Suppressing Radar InterferenceSelecting Pulselength Suppressing Noise InterferenceOff Centering the Display Navigation Data Display Echo TrailsPress the Menu key Select Nav Data and press the ENT key Echo Stretch magnifying long range echoesWatchman Selecting Unit of Measurement for RangeSelecting Bearing Reference Displaying Navigation Data During Stand-by Erasing the Heading MarkerDeselecting Ranges Displaying Cursor Position, Range and Bearing to Cursor Visual Alarm IndicationsOutputting Cursor Position to Navigator Super-refraction Interpreting the DisplayRadar Wave and Radar Horizon Target Properties and Radar Wave ReflectionFalse Echoes Bearing ResolutionRange Resolution Multiple echoes Blind and shadow sectors Nautical Chart and Radar PictureTroubleshooting procedure Maintenance & TroubleshootingSafety Information Forming any maintenance orReplacing the Fuse Preventative MaintenanceTroubleshooting table TroubleshootingSelf Test Self TestAntenna Unit Installation InstallationVent tube Removing packing materialsMounting platform How to fasten the radome base To the mounting platform Ships bow Removing packing materials 10 Antenna unit Model 841, inside view, shield cover removed 12 Optional mounting bracket installation for sailboat Display Unit Installation 13 How to mount the display unit 14 Display unit, rear view Procedure Option connectorInstallation Check List Displaying the Installation Menus Initial Adjustment of PictureRelative Bearing Alignment Entering Initial SettingsSweep Timing Closing the Installation MenusSignal cable connection Page Page Page Page Page Page Page