Note: If the scanner unit is installed at a close distance in front of the wheelhouse, your administration may require halt of transmission within a certain sector of scanner revolution. This is possible Ask your FURUNO representative or dealer to provide this feature. Distance to Radiator Model...
Unit This radar system contains the danger/ warning labels shown below. Do not remove the labels. If a label is peeling off or is illeg- ible, contact a FURUNO agent for replace- ment. WARNING To avoid electrical shock, do not remove cover.
TABLE OF CONTENTS INTRODUCTION ... v SYSTEM CONFIGURATION ... vi| MENU TREE ... viii OPERATIONAL OVERVIEW 1.1 Turning on the Power ... 1-1 1.2 Transmitter ON ... 1-1 1.3 Control Description... 1-2 1.4 CRT Brilliance ... 1-3 1.5 Control Panel Backlighting ... 1-3 1.6 Tuning the Receiver ...
A Word to the Owner of This FURUNO Radar Thank you for purchasing this FURUNO radar. We are confident you will discover why FURUNO has become synonymous with quality and reliability. Dedicated in the design and manufacture of marine electronics equipment for half a century, FURUNO Electric Company has gained an unrivaled reputation as a world leader in the in- dustry.
1.1 Turning on the Power The [POWER] switch is located at the top left corner of the display unit. Push it to switch on the radar set. To turn off the radar, push it again. The screen shows the bearing scale and digital timer approximately 15 seconds after power-on.
1.4 CRT Brilliance Operate the BRILL control on the control panel of the display unit to adjust the entire screen brightness. Note that the optimum point of adjustment varies with ambient light- ing conditions, especially between daytime and nighttime. 1.5 Control Panel Backlighting 1.
3. Press the  key twice to display the TUNE menu. TUNE 2. MODE AUTO 3. TUNE SET Figure 1-6 TUNE menu 4. Press the  key to select the option AUTO or MAN from the MODE field. 5. Press the [ENTER/SELECT] key. 6.
1.9 On-screen Legends and Markers Heading (Requires heading sensor.) Heading line Range ring interval Range to cursor Range to cursor /2 NM 4.111NM Bearing to cursor 103.7 R PULSE MIP Presentation mode OFF CENT Pulselength FUNC1 Offcenter COAST Function Target alarm zone No.
1.10 Presentation Modes This radar has the following presentation modes: Head-up, Head-up/TB, Course-up, North-up, and True Motion. Selecting presentation mode Press the [MODE] key on the panel at the right side of the display unit. Each time the [MODE] key is pressed, the presentation mode and mode indication at the upper-left corner of the screen change cyclically.
Presentation mode, representative display Heading marker North 020 030 marker North Heading line Description Course-up Mode Heading An azimuth stabilized display in which a line connect- line ing the center with the top of the display indicates own ship’s intended course (namely, own ship’s previous heading just before this mode has been selected).
Presentation mode, representative display North Heading marker line North marker Heading 340 350 line (a) True motion is selected Automatic resetting of own ship position in true motion mode 1.11 Selecting the Range Scale The range selected automatically determines the range ring interval, the number of range rings and pulse repetition rate, for optimal detection capability in short to long ranges.
1.12 Entering Own Ship’s Speed EPA requires an own ship speed input and compass signal. The speed can be entered from a speed log or navaid (automatic) or through the plotting keypad (manual). Automatic speed input 1. Press the [MENU] key and the  key twice to show the OTHER menu.
1.13 Pulselength, Echo Stretch The ECHO control selects pulselength, and echo stretch when it is not turned on with a user key ([F1], [F2], [F3]). The pulselength in use is displayed at the upper-left position of the screen using the abbreviations (suffixed with “P”) shown in the table on the next page.
1.14 Adjusting the Sensitivity The GAIN control adjusts the sensitivity of the receiver. It works in precisely the same manner as the volume control of a broadcast receiver, amplifying the signals received. The proper setting is such that the back- ground noise is just visible on the screen.
1.16 Suppressing Precipitation Clutter The vertical beamwidth of the scanner is de- signed to see surface targets even when the ship is rolling. However, by this design the unit will also detect rain clutter (rain, snow, or hail) in the same manner as normal tar- gets.
1.18 Measuring the Range Measuring range by the fixed range rings Use the fixed range rings to obtain a rough estimate of the range to a target. They are concentric solid circles about own ship, or the sweep origin. The number of rings is auto- matically determined by the selected range scale and their interval is displayed at the upper-left position of the screen.
Range and bearing to cursor 0.55 NM 15.0 R No. 2 EBL (dashed) Bearing to 45.5 R No. 1 EBL 314.0 R Bearing to No. 2 EBL Active marker is circumscribed. Figure 1-16 How to measure bearing by EBL 1.20 Collision Assessment by the Offset EBL The origin of the EBL can be placed any- where with the trackball to enable measure-...
3. Turn the VRM rotary control until the range marker on the No. 1 EBL aligns with target 2 in Figure 1-18. The active VRM readout at the lower-right corner of the screen indicates the distance between the two targets. 4.
Figure 1-20 Target alarm Note: If you wish to create a target alarm zone having a 360-degree coverage around own ship, set point “B” in almost the same direction (approx. 3 ) as point “A” and press the [GZ ALARM] key. Two alarm zones can be set as described above.
1.25 Electronic Plotting Aid (EPA) 10 operator-selected targets can be plotted electronically to assess their motion trend. Five past positions can be displayed for each of the plotted targets. If you enter a 6th plot on a certain target, the oldest plot (past posi- tion) will be erased.
True or relative vector, vector time Vectors can be displayed relative to own ship’s heading (Relative) or with reference to the North (True). This feature is available in all presentation modes (compass must be working correctly). The current vector mode is indicated at the upper-right corner of the screen.
2. Press the  key twice to select OFF from the ERASE field. 3. Press the [ENTER/SELECT] key followed by the [MENU] key. Setting CPA/TCPA alarm ranges When the predicted CPA of any target be- comes smaller than a preset CPA alarm range and its predicted TCPA less than a preset TCPA alarm limit, the EPA releases an au- dible alarm and displays the warning label...
Past plot points Past plot points may be marked on the dis- play with as many as nine dots. You can turn this display on/off as follows: 1. Press the [MENU] key. 2. Press the  key twice to select PLOT. PLOT MENU 1 1.
4. Press the [ENTER/SELECT] key to con- firm your selection, then the [MENU] key to close the menu. Trail gradation Target trails may be shown in monotone or multitone. Gradual shading paints the trails getting thinner with time just like the after- glow on an analog PPI radar.
3. Press the  key to select ON or OFF from the TRAIL COPY field as appropriate. 4. Press the [ENTER/SELECT] key and [MENU] key in order. Resetting target trails To reset (or clear) the target trail memory, hold the [TGT TRAIL] key depressed for about 3 seconds.
1.27 Parallel Index Lines Parallel index lines are useful for keeping a constant distance between own ship and a coastline or a partner ship when navigating. The orientation of the index lines is controlled with the EBL rotary control and the intervals between the lines adjusted with the VRM ro- tary control (provided that No.2 VRM is ac- tive).
1.29 Zoom The zoom function is useful for enlarging an area of interest as large as twice the normal viewing. This performs the range scale re- duction to a half and the offset at the same time. Zoom can be used on ranges other than 0.125, 72, 96, 120 nm.
1.31 User Keys (F1, F2, F3) The user keys [F1], [F2] and [F3] may be pro- grammed by the operator to display a desired menu. For example, you can program the [F2] key to select target trail time whenever the key is pressed.
Adjusting these features on a function key menu changes the original function key set- tings. To restore the original settings for a particular function key, it is necessary to dis- play the relevant function key menu and se- lect appropriate menu options. Table 1-2 FUNC key objectives 1.
1.33 Suppressing Second-trace Echoes In certain situations, echoes from very dis- tant targets may appear as false echoes (sec- ond-trace echoes) on the screen. This occurs when the return echo is received one trans- mission cycle later, that is, after a next radar pulse has been transmitted.
1.35 Noise Rejector The noise rejector suppresses white noise, which appears on the screen as many dots scattered randomly over the display. To suppress white noise: 1. Press the [MENU] key. 2. Press the  key twice to show the ECHO SIG menu.
Echo enlarged in bearing and range directions Figure 1-48 How the enhance function works Note: Enhanced video can also be selected with a user key. 1.38 Degaussing Interval The screen is degaussed automatically at certain time intervals, as well as each time the radar is turned on, to demagnetize the CRT screen to eliminate color contamination caused by earth’s magnetism or magnetized...
1.40 Video Contrast The video contrast is adjustable in three lev- els according to the radar video sampling level. Select the level so that the video con- trast feature changes the dynamic range of the video signal to improve picture contrast. Picture shows up most clearly from the back- ground.
1.43 Background Color The secondary function of the BRILL control (BKGND COLOR) is to select the color of the background, characters, menu, markers and indications, from the five color combinations shown in the table below. Each press of the control selects one of the five color combina- tions.
1.46 A/D Converter Curve Setting Video signal threshold level and color output setting (for the CRT) are executed when the video signal is converted from analog to digi- tal. Select the A/D curve according to objec- tive referring to the table below. The default setting is A.
1.49 Peformance Monitor The performance monitor (PM-30 for FR-1710/1725, PM-50 for 1760DS) provides an effec- tive means of general performance check of a radar installation. It works like a transponder. Installed in the proximity of the radar antenna, it is triggered by part of the transmitted micro- wave energy and sends back a coded signal to the antenna for display on the radar screen.
This is determined by pulselength only. Practically, a 0.08 microsec- ond pulse offers the discrimination better than 35 m as do so with all FURUNO radars. Test targets for determining the range and bearing resolution are radar reflectors hav-...
Target A Target B Target B (Spurious) (True) Figure 2-3 Sidelobe echoes Virtual image A relatively large target close to your ship may be represented at two positions on the screen. One of them is the true echo directly reflected by the target and the other is a false echo which is caused by the mirror effect of a large object on or close to your ship as shown in the figure below.
When the range to the SART is reduced to about 1 nm, the radar display may show also the 12 responses generated during the fast sweeps. These additional dot responses, which also are equally spaced by 0.64 nm, will be interspersed with the original line of 12 dots.
Radar side lobes As the SART is approached, side lobes from the radar scanner may show the SART re- sponses as a series of arcs or concentric rings. These can be removed by the use of the anti-clutter sea control although it may be operationally useful to observe the side lobes as they may be easier to detect in clut- ter conditions and also they will confirm that...
MAINTENANCE, TROUBLESHOOTING 3.1 Periodic Maintenance Schedule Periodic checks and maintenance are important for proper operation of any electronic sys- tems. This chapter contains maintenance instructions to be followed to obtain optimum per- formance and the longest possible life of the equipment. WARNING ELECTRICAL SHOCK HAZARD Do not open the equipment.
3.3 Fuse Replacement Various fuses are used to protect the equip- ment from overvoltage (overcurrent) or equip- ment fault. If the fuse blows find the cause before replacing. If the fuse blows again after replacement, request service. CAUTION Use the proper fuse. Use of a wrong fuse can cause fire or equipment damage.
3.6 Advanced-level Troubleshooting This paragraph describes how to cure hardware and software troubles which should be car- ried out by qualified service personnel. Note: This radar equipment contains complex modules in which fault diagnosis and repair down to component level are not practicable by users. Serviceman qualification All adjustments of radio transmitter during or coinciding with the installation, servicing, or maintenance which may affect the proper operation must be performed by or under the imme-...
3.7 Diagnostic Test A diagnostic test program is provided to en- able testing of major circuit boards in the ra- dar display unit. Note that the normal radar picture is lost during this test. Proceed as follows to execute the diagnostic test: 1.
FR-1700 Series TEST 1. Program No. 2. ROM Check 3. RAM Check 4. Antenna Rotation 5. Tx Trigger Frequency 3000Hz 6. Video Level 7. Video Signal 8. Navigation I/O 1 9. Navigation I/O 2 10. NMEA Heading IN 11. LOG Pulse IN ARP Test 1.
Do not touch anode cap or its cable. Figure 4-1 Display unit, right side view Cooling Fan MMS-06C24DS-R01 FR-1710: HV Board 03P9017A FR-1725: HV Board 03P9017B FR-1710/1725: DC-PTU Board 03P9223A AC-PTU Board 03P9228A/B FR-1760DS: DC-PTU Board 03P9223B PARTS LOCATION...
(2) Scanning (3) Range scales and ring intervals Range(nm) 0.125 Ring interval(nm) 0.025 No. of Rings Maximum Range: FR-1710: 72 nm, FR-1725: 96 nm, FR-1760DS: 120 nm (4) Range discrimination (5) Bearing discrimination (6) Minimum range Range (nm) 0.25 0.75 0.07 s...
7. COATING COLOR (1) Display Unit (2) Antenna Unit 8. COMPASS SAFE DISTANCE (1) Display unit (2) Antenna unit FR-1710: FR-1725: FR-1760DS: (3) Antenna power supply unit Standard: 1.20 m To be installed in an exposed area Panel: N3.0, Chassis: 2.5GY5/1.5 N9.5...