Furuno FR-8111, FR-8251 manual Problem Check point and probable Remedy Cause

Page 55

Problem

Check point and probable

Remedy

 

cause

 

 

 

 

 

 

 

Adjust GAIN control

1.

IF amplifier

1.

Replace IF amplifier.

with A/C SEA control

2.

Signal cable between

2.

Check continuity and isolation of

set at minimum. Marks

 

antenna and display

 

coaxial cable. (Note: Disconnect the

and legends appear but

3.

Video Amplifier Circuit

 

plug and lugs at both ends of coaxial

no noise or echo.

 

 

 

cable before checking it by

 

 

 

 

ohmmeter.)

 

 

 

3.

Check video coax line for secure

 

 

 

 

connection. If connection is good,

 

 

 

 

replace SPU Board.

 

 

 

 

 

Marks, legends and

1.

Magnetron

1.

Check magnetron current.

noise appear but no

2.

Modulator Board

 

Replace magnetron.

echo. (Transmission

3.

Modulator SCR

2.

Replace Modulator Board.

leak, representing own

4.

SPU Board

3.

Replace SCR.

ship position, is

 

 

 

DANGER! - High Voltage

absent.)

 

 

4.

Replace SPU Board.

 

 

 

 

 

 

 

 

Picture not updated

1.

Bearing Signal Generator

1.

Check the connection of signal cable.

 

 

Board (antenna unit)

2.

Replace SPU Board.

 

2.

SPU Board

3.

Turn off and on radar.

 

3.

Video lockup

 

 

 

 

 

 

 

Incorrect orientation of

1.

SPU Board

1.

The HDG readout shows xxx.x when

picture

2.

Gyro Interface

 

heading signal is not received.

 

 

 

2.

Replace gyro interface.

 

 

 

 

 

TUNE control adjusted

1.

Deteriorated magnetron

1.

With radar transmitting on 48 mm

but poor sensitivity

2.

Detuned MIC

 

range, check magnetron

 

3.

Dirt on radiator face

 

current. If current is below normal

 

4.

Water ingress to the

 

value, magnetron may be

 

 

waveguide or other feeder

 

defective. Replace magnetron.

 

 

line.

2.

Check MIC detecting current. If it is

 

5.

Second trace rejection is ON.

 

below normal value, MIC may have

 

 

 

 

become detuned. MIC must be tuned.

 

 

 

3.

Clean radiator surface.

 

 

 

4.

Remove water from the feeder line.

 

 

 

5.

Disable the second-trace rejector

 

 

 

 

referring to paragraph 1.31.

 

 

 

 

 

Range changed but no

1.

Defective RANGE key

1.

Try to hit [+] and [-] RANGE keys

radar picture change

2.

SPU Board

 

several times. If unsuccessful,

 

3.

Video lockup

 

replacement of keypad may be

 

 

 

 

required.

 

 

 

2.

Replace SPU Board.

 

 

 

3.

Turn off and on radar.

 

 

 

 

 

4 – 3

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Contents Marine Radar 00080735211 Safety Information Do not diassemble or modify the equipment Iii Radio Frequency Radation HazardUse the correct fuse Compliance with R&TTE Directive 1999/5/EC Table of Contents Maintenance Foreword Features Word to FR-8051/8111/8251 OwnersVii Configuration of FR-8051/8111/8251 Antenna Unit SpecificationsTransceiver Module Others Power Supply and Power ConsumptionDisplay Unit Environmental ConditionsStandard Set Equipment ListsXii Spare Parts Optional EquipmentXiii Xiv Categorization by SpecificationControl Description Operation25 NM Display IndicationsDisplay indications lower part Selecting Range Turning the Radar On/OffTransmitting, Stand-by Selecting presentation mode Presentation ModeDescription Basic menu operation Menu OverviewChanging pages on the Initial menu MK Erase erase all fixed marks Menu treeInitial Tune SET AUTO, Manu SPD Mode MAN, LOG, NAV Selecting tuning mode Tuning the ReceiverAdjusting Sensitivity Adjusting Picture BrillianceAutomatic anti-clutter control Adjusting Brilliance of Control Panel and MarkersAdjusting Range Ring Brilliance Suppressing Sea ClutterMeasuring range by the range rings Suppressing Rain ClutterHeading and North Markers Measuring the RangeMeasuring Bearing Collision Assessment by Measuring Range Offset EBL Canceling the cursor offsetOff-centering the Picture Index LinesInscribing Marks on the Display ZoomFunction key Turning on a function Own Ship SpeedAutomatic speed input Manual speed input Ship’s GraphicInterference Rejector Echo TrailsTrail reference Canceling echo trailStarting echo trail Trail timeTrail brilliance Electronic Plotting E-plotPlotting a target Vector time Canceling target plottingTarget data True or relative vectorActivating the guard zones Setting a Guard Alarm ZoneSetting a guard zone Selecting guard zone typeHow to turn on echo averaging Watch AlarmSilencing the aural alarm Canceling the guard zone and guard alarm26 Echo average Suppressing Second-Trace EchoesSelecting Pulselength Presetting pulselengthEcho Stretch Noise RejectionOutputting Cursor Position TLL data Waypoint DisplaySelecting pulselength set to use Selecting Unit of Range Measurement, Bearing Reference Alarm Output Signal On/OffSector Blanking This page is intentionally left blank Radar Observation Range ResolutionRadar Picture, Target Properties and Radar Pulse Multiple echoes Bearing ResolutionFalse Echoes Indirect echoesBlind and shadow sectors Minimum and Maximum RangesSide-lobe echoes Minimum rangeLocating a Ship or Survival Craft in Distress by Sart Gain This page is intentionally left blank When Working on the Antenna Unit MaintenancePeriodic Maintenance Schedule Simple Troubleshooting TroubleshootingServiceman qualification Advanced-level TroubleshootingProblem Check point and probable Remedy Cause Problem Check point and probable Remedy Cause Diagnostic test, test pattern Diagnostic TestThis page is intentionally left blank Antenna Unit Location of PartsModulator Trigger RF Transceiver UnitRF transceiver unit FR-8051/8111 Display unit, top view Display Unit common to all modelsDisplay unit, right side view This page is intentionally left blank Operating a performance monitor Performance MonitorVideo Plotter RP-15 Auto Plotter ARP-15Fluxgate Heading Sensor C-2000 Page

FR-8251, FR-8111 specifications

Furuno has long been a leader in marine electronics, and its FR-8251 and FR-8111 radar systems continue that tradition. Both are advanced systems designed specifically for professional mariners who demand high performance, reliability, and technological sophistication in their navigational tools.

The Furuno FR-8251 is a powerful radar system that boasts a range of features tailored for commercial vessels. With a 25 kW transmitter, the FR-8251 delivers exceptional performance, providing a clearer and more detailed image of the maritime environment. It is equipped with advanced signal processing technology, including the Doppler processing feature, which allows for the detection of moving targets. This is highly beneficial for collision avoidance, as it provides accurate information regarding the speed and direction of other vessels.

Another noteworthy feature of the FR-8251 is its large, high-resolution display that enhances visibility and ease of use, even in challenging weather conditions. The user interface is straightforward, allowing for quick adjustments and easy navigation through the various settings. It supports a variety of display formats and allows for customization, enabling operators to tailor the information presented according to their specific needs.

On the other hand, the Furuno FR-8111 is equally impressive and designed as a more compact solution without sacrificing performance. This model comes with a 12 kW output and is specifically crafted for smaller vessels, yet it still delivers high-quality radar coverage. Utilizing Furuno’s renowned Automatic Target Tracker (ATT) technology, the FR-8111 enables mariners to efficiently track multiple targets, significantly enhancing situational awareness.

Additionally, both the FR-8251 and FR-8111 come with integrated ARPA (Automatic Radar Plotting Aid), providing users with sophisticated tools for navigation and collision avoidance. The presence of multiple target tracking empowers operators to make informed decisions, optimizing safety at sea.

Furuno’s commitment to reliability and durability is evident in both models, which are designed to withstand the harsh marine environment. Their robust build quality ensures longevity, while their advanced technologies offer peace of mind.

Both the Furuno FR-8251 and FR-8111 are excellent choices for professional mariners seeking cutting-edge radar systems. With their impressive performance, user-friendly interfaces, and advanced technologies, these radar systems set the standard in marine navigation, providing essential support for safe and efficient voyages.
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