Furuno FR-8051 manual Simple Troubleshooting, Problem Remedy

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Chapter 4

TROUBLESHOOTING

Danger!-Electrical Shock Hazard

This equipment contains high voltages which can endanger human life at several internal circuits including a cathode ray tube (CRT) which uses several thousands volts. Any internal adjustment, servicing and repair shall only be performed by qualified service personnel totally familiar with electrical circuits and servicing of the equipment. A residual charge remains in capacitors and other devices several minutes after turning off the power. It is therefore essential to wait at least 3 min- utes to allow residual charge to subside before accessing the inside of the equip- ment. Special care must be taken when approaching the following parts:

•Power supply circuit (Display unit and separate power supply units)

•CRT circuit (Display unit)

•Modulator circuit and magnetron (Antenna unit or separate transceiver unit)

•Motor drive circuit (Antenna unit)

When Working on the Antenna Unit

Wear a safety belt and a hard hat when working on the antenna unit. Always make sure that the radar is POWERED OFF and the Antenna Switch in the display unit is OFF before working on the antenna unit. Also take all steps to ensure that the radar will not be accidentally operated by someone else, to prevent the potential risk of being struck by the rotating antenna and exposure to RF radiation hazards.

4.1 Simple Troubleshooting

This paragraph describes how to cure operational problems, by observing the radar picture and using operator controls and touchpad keys without opening the display unit, antenna unit or other equipment units.

The table below shows user-level troubleshooting procedures.

Problem	Remedy
No own ship mark	On the R-type radar, check that SHP GRPH ON is selected at
	the INITAL menu, referrring to paragraph 1.24. The own ship
	mark is not available on the N-type radar.

4 – 1

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Contents Marine Radar First Edition NOV Safety Information Do not diassemble or modify the equipment Radio Frequency Radation Hazard IiiUse the correct fuse Table of Contents Maintenance Vii Features Word to FR-8051/8111/8251 OwnersForeword Configuration of FR-8051/8111/8251 Transceiver Module SpecificationsAntenna Unit Environmental Conditions Power Supply and Power ConsumptionDisplay Unit OthersXii Equipment ListsStandard Set Name Type Qty RemarksXiii Optional EquipmentSpare Parts Name Type Code No RemarksFunction Type Categorization by SpecificationXiv Operation Control DescriptionDisplay Indications 25 NMDisplay indications lower part Transmitting, Stand-by Turning the Radar On/OffSelecting Range Presentation mode Description Representative display Presentation ModeSelecting presentation mode Presentation mode DescriptionChanging pages on the Initial menu Menu OverviewBasic menu operation Menu tree MK Erase erase all fixed marksInitial Tune SET AUTO, Manu SPD Mode MAN, LOG, NAV Adjusting Picture Brilliance Tuning the ReceiverAdjusting Sensitivity Selecting tuning modeSuppressing Sea Clutter Adjusting Brilliance of Control Panel and MarkersAdjusting Range Ring Brilliance Automatic anti-clutter controlMeasuring the Range Suppressing Rain ClutterHeading and North Markers Measuring range by the range ringsMeasuring Bearing Canceling the cursor offset Collision Assessment by Measuring Range Offset EBLIndex Lines Off-centering the PictureFunction key ZoomInscribing Marks on the Display Automatic speed input Own Ship SpeedTurning on a function Echo Trails Ship’s GraphicInterference Rejector Manual speed inputTrail time Canceling echo trailStarting echo trail Trail referencePlotting a target Electronic Plotting E-plotTrail brilliance True or relative vector Canceling target plottingTarget data Vector timeSelecting guard zone type Setting a Guard Alarm ZoneSetting a guard zone Activating the guard zonesCanceling the guard zone and guard alarm Watch AlarmSilencing the aural alarm How to turn on echo averagingSuppressing Second-Trace Echoes 26 Echo averageNoise Rejection Presetting pulselengthEcho Stretch Selecting PulselengthSelecting pulselength set to use Waypoint DisplayOutputting Cursor Position TLL data Sector Blanking Alarm Output Signal On/OffSelecting Unit of Range Measurement, Bearing Reference Radar Picture, Target Properties and Radar Pulse Range ResolutionRadar Observation Indirect echoes Bearing ResolutionFalse Echoes Multiple echoesMinimum range Minimum and Maximum RangesSide-lobe echoes Blind and shadow sectorsLocating a Ship or Survival Craft in Distress by Sart Gain Maintenance When Working on the Antenna UnitInterval Check point Check and measures Remarks Part Type Life expectancy RemarksProblem Remedy TroubleshootingSimple Troubleshooting Problem Check point and probable Remedy Cause Advanced-level TroubleshootingServiceman qualification Problem Check point and probable Remedy Cause Problem Check point and probable Remedy Cause Diagnostic Test Diagnostic test, test patternLocation of Parts Antenna UnitRF Transceiver Unit Modulator TriggerRF transceiver unit FR-8051/8111 Display Unit common to all models Display unit, top viewDisplay unit, right side view Transmitter Receiver Performance Performance MonitorOperating a performance monitor Display Meaning Transmitter normal Receiver normalFluxgate Heading Sensor C-2000 Auto Plotter ARP-15Video Plotter RP-15 Page