Furuno CH-250 Operator's Manual
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Furuno CH-250 Operator's Manual

Color lcd searchlight sonar
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OPERATOR'S MANUAL
COLOR LCD
SEARCHLIGHT SONAR
CH-250/CH-250S
MODEL
www.furuno.co.jp

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Summary of Contents for Furuno CH-250

  • Page 1 Back OPERATOR'S MANUAL COLOR LCD SEARCHLIGHT SONAR CH-250/CH-250S MODEL www.furuno.co.jp...
  • Page 2 Nishinomiya, 662-8580, JAPAN Telephone : +81-(0)798-65-2111 : +81-(0)798-65-4200 Printed in Japan All rights reserved. Pub. No. OME-13160-P (DAMI ) CH-250/250S The paper used in this manual is elemental chlorine free. ・FURUNO Authorized Distributor/Dealer A : MAR P : APR . 08, 2011...
  • Page 3 (http://www.eiae.org/) for the correct method of disposal. How to discard a used battery Some FURUNO products have a battery(ies). To see if your product has a battery, see the chapter on Maintenance. Follow the instructions below if a battery is used. Tape the + and - terminals of battery before disposal to prevent fire, heat generation caused by short circuit.
  • Page 4 Continued use of the equipment can cause fire or electrical shock. Contact a FURUNO agent for service. Do not disassemble or modify the equipment. Fire, electrical shock or serious injury can result.
  • Page 5 Warning labels are attached to the display, transceiver and hull units. Do not remove the labels. If a label is missing or illegible, contact a FURUNO agent or dealer. TRANSCEIVER UNIT WARNING Name: Warning Label (1)

  • Page 6: Table Of Contents

    TABLE OF CONTENTS FOREWORD ... vi SYSTEM CONFIGURATION ... viii 1. OPERATIONAL OVERVIEW ... 1-1 1.1 Control Description... 1-1 1.2 Remote Controller ... 1-2 1.3 Turning the Power On/Off... 1-3 1.4 Raising, Lowering the Transducer ... 1-4 1.5 Adjusting Screen Brilliance, Panel Dimmer ... 1-5 1.6 Selecting a Display...
  • Page 7 4. ECHO SOUNDER MODE ... 4-1 4.1 Operational Overview... 4-1 4.2 Typical Echo Sounder Display... 4-2 4.3 Selecting the Range... 4-3 4.4 Train Direction... 4-4 4.5 Selecting Tilt Angle... 4-4 4.6 Selecting Picture Advance Speed... 4-4 4.7 Measuring Range by Cursor... 4-5 4.8 Event Marker...

  • Page 8: Foreword

    The CH-250/CH-250S displays underwater objects on a bright 10.4” color LCD display, in 8 or 16 colors according to received echo strengths. Operating frequency is selectable among 60, 88 and 150 kHz for CH-250 and 180 and 240 kHz for CH-250S. Eight operating modes provide information for virtually any fishing application.
  • Page 9 Usage Precautions • The Motion Sensor MS-100 compensates for ship’s pitching and rolling. However, it does not compensate for load unbalance. • If the equipment will not be used for a long time shut off the power to it at the mains switchboard to prevent battery discharge.

  • Page 10: System Configuration

    SYSTEM CONFIGURATION INTERFACE UNIT IF-8000 Display Unit VGA Ext. Monitor TRANSCEIVER UNIT CH-253 HULL UNIT SPEAKER DA T A/VIDEO OUT Speaker Note 1: MU-100C is the standard supply monitor unit. An external monitor may be connected via the interface unit (option). The drawing above shows the system configuration with the MU-100C.

  • Page 11: Operational Overview

    Horizontal/Video Plotter Horizontal/History Selects center bearing of training sector. Selects detection range. Switches training sector to 360˚ (horizontal mode), or 180˚ (vertical fan mode). Selects scan speed (sonar)/picture advancement speed (echo sounder). Provide short-cut key or one-touch setup. Adjusts display brilliance.

  • Page 12: Remote Controller

    Remote Controller The Remote Controller CH-256 (option) provides armchair control over range, tilt, target lock and range of sounding. Select display range. Selects range of sounding for full circle 360˚ (horizontal mode) or half circle 180˚ (vertical fan mode). Note: The remote controller can also be used with a commercial monitor. Figure 1-2 Remote controller Select tilt angle.

  • Page 13: Turning The Power On/Off

    1.3.1 Power on This sonar has a demonstration mode which lets the operator become acquainted with the features of the sonar. For further details see page 5-18. Press the [POWER] switch on the control unit till hear “click.” A beep sounds, the lamp above the switch lights and the last-used display appears.

  • Page 14: Raising, Lowering The Transducer

    Raising, Lowering the Transducer 1.4.1 Lowering the transducer With the boat at the fishing ground, press the [ above the switch blinks while the transducer is being lowered and lights when it is completely lowered. The down arrow of the transducer status indicator at the top right corner of the display is filled when the transducer is completely lowered.

  • Page 15: Adjusting Screen Brilliance, Panel Dimmer

    Adjusting Screen Brilliance, Panel Dimmer Screen brilliance can be adjusted in nine steps and panel dimmer (backlighting) in four. 1. Press the [BRILL] key to open the dialog box for screen brilliance and panel dimmer. Do the next step within four seconds, otherwise the dialog box will be erased. BRILL:3 DIMMER:3 Figure 1-3 Brilliance, panel dimmer dialog box...

  • Page 16: Selecting A Display

    Selecting a Display This sonar has eight display modes and you may select one with one of the DISPLAY MODE keys. Refer to the chapter shown in the illustration for more information about each mode. Picture HORIZONTAL This mode provides 360 degree coverage.

  • Page 17: Adjusting The Gain

    Adjusting the Gain The [GAIN] control adjusts the sensitivity of the receiver. Normally, the control is adjusted so that the bottom echo is displayed in reddish-brown mixed with red. Initially set the gain between “4” and “6” and then fine tune depending on fishing ground, etc. Too Low Basic Menu Operation The menu, consisting of six menus, mostly contains items which once preset do not require...
  • Page 18 2. The last-used menu is displayed. (In Figure 1-6 the COM2 menu is selected.) To select a different menu, press select menu desired. 3. Press to select menu item desired. At the bottom of the screen menu help is provided. 4.

  • Page 19: Horizontal Mode

    2. HORIZONTAL MODE Operational Overview The figure below shows the typical horizontal mode operating sequence. 6(a). Set scanning sector. Turn on the power. Adjust gain. Lower the Select appropriate transducer. horizontal mode. Set center bearing of train sector. Set range. 6(b).

  • Page 20: Typical Horizontal Mode Display

    Typical Horizontal Mode Display * Depth marker When depth data is input from external equipment, the depth marker shifts according to depth data. If the depth data is greater than the horizontal range, the depth marker shifts to lowest position. Demonstration mode Cursor data...

  • Page 21: Selecting The Range

    Selecting the Range The [RANGE] control selects the detection (display) range. Select the range according to either the fish species being searched or the depth desired. 15 ranges are available and minimum and maximum ranges depend on the transducer used. BOTTOM Default horizontal mode range settings 60 kHz...

  • Page 22: Selecting Sector Width

    Selecting Sector Width Sector means the width of the transducer training. The [SECTOR] control selects the training (display) area among the sixteen positions shown in the table below. Clockwise rotation of the control increases the sector width; counterclockwise rotation decreases it. Sector width ( ) In the full-circle mode (360 ) the direction of training is clockwise;...

  • Page 23: Selecting Train Center

    Selecting Train Center The [TRAIN] control selects the center direction of the detection range. The range of adjustment is 0 to 354 in increments of 6 . The selected bearing is shown with a filled circle, the train indicator, on the bearing scale. Selecting the Tilt Angle The tilt angle shown the direction to which the sound wave is emitted.

  • Page 24: Bottom Echo And Tilt Angle

    2.6.1 Bottom echo and tilt angle Refer to the illustration below. Case1: Tilt angle 30 to 40 This tilt angle will display the entire bottom since it is captured by the full width of the beam. Case2: Tilt angle 10 to 20 This tilt angle will only display half the bottom since it is only captured by the lower half of the beam.

  • Page 25: Points To Consider

    Points to consider Normally, a vertically distributed fish school is a better sonar target than the bottom, because it reflects the transmitted pulse back toward the transducer. In case 3, both fish schools “a” and “b” are presented. Generally speaking, however, midwater fish schools tend to be larger than bottom fish schools and they are often displayed near the bottom on the display.
  • Page 26 Tilt angle and beam coverage (frequency 60 kHz, vertical beamwidth 12 (200) 20(40) 40(80) 60(120) 80(160) 100(200) 200(400) Vertical width of sonar beam 100 m 100 m 21 m Figure 2-9 Tilt angle and beam coverage (400) (600) 300 m...

  • Page 27: Selecting The Training Speed

    Selecting the Training Speed The training speed selects how fast the transducer scans the sounding sector. Two choices are available, normal speed (default setting) and high speed, and one may be selected with the [FAST SCAN] key. Each time the key is pressed “NORM” (normal speed) or “FAST” (high speed) momentarily appears at the screen top.

  • Page 28: Event Marker

    Event Marker The event marker functions to mark important locations on the screen, and five event markers may be inscribed. Each time the [EVENT] key is pressed the “latest event marker” ( inscribed at the cursor location and all previously entered event markers are shown by the “previous event marker”...

  • Page 29: Depth And Horizontal Range Markers

    2.9.2 Deleting all event markers All event markers can be erased from the screen as follows: 1. Operate the Omnipad to place the cursor outside the display area. 2. Press the [EVENT] key to show the following dialog box. Do the next step within four seconds, otherwise the dialog box will be erased.

  • Page 30: Adjusting The Picture

    2.11 Adjusting the Picture 2.11.1 Suppressing bottom and surface reflections In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the TVG controls. In such cases, try to reduce the output power, without turning down the gain. The picture becomes clearer when output power is reduced rather than when the gain is decreased.

  • Page 31: Suppressing Bottom Tail

    The sonar operator will be quite inconvenienced if these echoes are directly displayed on the screen, since he won’t be able to judge the actual size of the target from the size of echoes displayed on the screen.
  • Page 32 To adjust TVG: 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER TARGET KEY LOCK MODE AUTO TILT : SELECT 3. Press to select TVG DISTANCE and press TVG DISTANCE 4.
  • Page 33 5. Press the [MENU] key to register your selection and close the menu. 6. To suppress reflections by the sea surface or plankton, select TVG LEVEL and press 7. Press to adjust TVG LEVEL, considering sea conditions. A setting between 2.0 and 5.0 should provide satisfactory results.
  • Page 34 2.11.5 Enlarging fish echoes (expand horizontal display) Fish echoes may be enlarged 1.5 times by using the expanded horizontal display. Press the key to show the expanded horizontal display. The direction of expansion depends on the train direction as below. Train center direction 318 –42 48 –123...

  • Page 35: Target Lock

    2.12 Target Lock Three types of target lock modes are available. Manual reverse: The transducer train direction is reversed manually. This is the default setting, and is available in the horizontal and vertical fan modes. Position: Tracks stationary position (such as a reef) using position data from a navigator.

  • Page 36: Position Mode

    2.12.3 Position mode This mode tracks a stationary position (such as a reef) using position data fed from a navigator. Note1: This function is inoperative in the echo sounder mode. In the vertical fan mode the reverse mode is automatically selected regardless of the setting in paragraph 2.12.1. Note2: This mode requires position data.

  • Page 37: Echo Mode

    2.12.4 Echo mode The echo mode tracks a fish school either automatically or manually. The default setting is automatic, and you can select automatic or manual with “LOCK MODE” in the HORZ menu. Automatic echo tracking mode The automatic echo target lock function automatically tracks a fish school appearing in the operator-selected target lock zone.
  • Page 38 When the fish echo is lost the tilt angle is automatically changed as below to continue tracking the echo: Tilt changed to search [(A + 10˚) Detection area displayed once again and target lock indicator lights. 5. To turn off the target lock, press the [TARGET] key again. The message “LOCK END” appears for three seconds at the screen top, the target lock indicator disappears and operation continues with current train and tilt settings.

  • Page 39: Horizontal Menu Overview

    2.13 Horizontal Menu Overview This section presents an overview of the items on the HORZ menu. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES.
  • Page 40 CLUTTER: Low intensity echoes, often caused by sediments in water, are painted on the screen as a large number or random dots. This noise can be suppressed. The higher the number (setting) the weaker the echoes which are erased. RES. COLOR: Sets transfer characteristics of input signal level versus display echo level. Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG, and you can observe the characteristics of each by watching the color bar as you change the setting.

  • Page 41: Interpreting The Horizontal Display

    2.14 Interpreting the Horizontal Display This section provides information necessary for interpreting the horizontal display. 2.14.1 How the horizontal mode picture is painted The wide sounding beam is emitted from the soundome at a certain tilt angle (see hatched area in the figure below).

  • Page 42: Sample Echo Displays

    2.14.2 Sample echo displays Bottom echoes When the tilt angle is changed, the bottom echo illustrated below will appear on the display. When the tilt is decrease (toward 0 ), the bottom trace becomes winder and weaker. By observing the bottom condition on the display, the skipper can prevent net damage. (A) Flat bottom Tilt angle: 10˚...

  • Page 43: Fish Schools

    A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of fish schools on the sonar beam. To find distribution and center point of a fish school, try several different tilt angles.

  • Page 44: Sea Surface Reflections

    To reduce sea surface reflections, set the tilt angle to 5 or higher, so the upper edge of the sonar beam does not hit the sea surface, or adjust TVG. When a decreased tilt angle is used, sea surface reflections cover a large area as illustrated below.

  • Page 45: Noise And Interference

    When the fishing ground is crowded with many fishing boats, the sonar is subject to interference from ultrasonic equipment (echo sounder or sonar) on other boats as well as those on own ship. For instance, interference from the sonar operated on other boats will show itself on the display as in (A) in the figure below.

  • Page 46: Combination Display Examples

    2.14.3 Combination display examples Horizontal/history display Press the key to display the horizontal/history display. Cursor position data B148˚ Own ship marker Train position Cursor Horizontal Display The horizontal display appears in the main window; the history display in the sub window. The length of the picture displayed in the history display is equal to about four full circle pictures.
  • Page 47 * Requires appropriate sensor. Video Plotter Display Interference rej. ON Target lock indicator Transducer status indicator Position in latitude*, longitude* Course*, speed* 9.9 kt Sonar range marker (Radius changes with video plotter range.) Event marker (Entered from horizontal mode) Scale Track* 2-29...
  • Page 48 Horizontal/strata display Press the key to display the horizontal/strata display. Cursor position data →12 ↓ 10 B133˚ Own ship marker Train position Color bar for strata display Cursor Horizontal Display (main display) The horizontal display appears in the main window; the strata display in the sub window. The strata picture shows bottom undulations in different colors.
  • Page 49 Color bar for the strata display The depth of the bottom each in all directions is displayed in the sub window, in the colors set by the color bar for the strata display. The color bar for the strata display shows search angle range below 336 degrees.
  • Page 50 Projection in fore direction and strata display Color "b" Figure 2-31 Projection in fore direction and strata display Depth becoming shallower gradually in fore direction and strata display Color "a" Color "a" Figure 2-32 Depth becoming shallower gradually in fore direction and strata display Depth becoming deeper gradually in fore direction and strata display Color "a"...

  • Page 51: Vertical Fan Mode

    3. VERTICAL FAN MODE Operational Overview The figure below shows the typical vertical fan mode operating sequence. 7(a). Set scanning sector. Turn on the power. Adjust gain. Lower the transducer. Select appropriate vertical fan mode. Set center bearing of train sector.

  • Page 52: Typical Vertical Fan Mode Display

    Typical Vertical Fan Mode Display Bearing indicator (Shows training direction.) FORE ship PORT Training indicator Interference rejector ON Cursor position data FORE Fish echo Cursor Horizontal range Bottom echo Depth Horizontal marker Sector center indicator Sweep indicator (Shows tilt angle in vertical fan mode.) Figure 3-2 Typical vertical fan mode display STARBOARD...

  • Page 53: Selecting The Range

    Selecting the Range The [RANGE] control selects the detection (display) range, in 15 settings. Select the range according to either the fish species being searched or the depth desired. Each time the control is operated the newly selected range briefly appears in large characters at the screen top. Range is permanently displayed at the top right-hand corner of the screen.

  • Page 54: Selecting Train Center

    Selecting Train Center The [TRAIN] control determines the bearing of the vertical fan beam, from 0 to 180 . Bearing of beam position can be found with the train indicator. 0˚ (360˚) 6˚ 12˚ 18˚ 180˚ Train Indicator Train of Vertical Fan Beam Train indicator TRAIN Figure 3-4 Train indicator...

  • Page 55: Selecting Display Sector

    Selecting Display Sector Sector means the width of the transducer training, from 6 to 180 The [SECTOR] control selects the training area among the sixteen positions shown in the table below. Clockwise rotation of the control increases the sector width; counterclockwise rotation decreases it.

  • Page 56: Selecting Sector Center

    Selecting Sector Center The center direction of the sounding beam in the vertical direction can be changed with the [TILT] control. The setting range is 0 to 180 in increments of 6 . Select the setting which places the sector center in the middle of the detection range. Sector center angle set with TILT control PORT...

  • Page 57: Selecting The Training Speed

    Selecting the Training Speed The training speed selects how fast the transducer scans the display sector. Two choices are available, 3 (normal speed, default setting) and 6 (high speed), and one may be selected with the [FAST SCAN] key. Each time the key is pressed the display momentarily shows “NORM” (normal speed) or “FAST”...

  • Page 58: Event Marker

    Event Marker The event marker functions to mark important locations on the screen, and five event markers may be inscribed. Each time the [EVENT] key is pressed the “latest event marker” ( ) is inscribed at the cursor location and all previously entered event markers are shown by the “previous event marker”...

  • Page 59: Depth And Horizontal Range Markers

    3.9.1 Deleting all event markers All event markers can be erased from the screen as follows: 4. Operate the Omnipad to place the cursor outside the display area. 5. Press the [EVENT] key to show the following dialog box. Do the next step within four seconds, otherwise the dialog box will be erased.

  • Page 60: Adjusting The Picture

    The sonar operator will be quite inconvenienced if these echoes are directly displayed on the screen, since he won’t be able to judge the actual size of the target from the size of echoes displayed on the screen.

  • Page 61: Suppressing Noise And Interference

    4. Press to adjust TVG distance, considering sea conditions. The larger the figure the greater the distance at which the TVG works. Distance Setting Meters Feet Passi/braza Hiro 5. Press to close the dialog box and return to the VERT menu. 6.

  • Page 62: Vertical Menu Overview

    3.12 Vertical Menu Overview This section presents an overview of the items on the VERT menu. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES.

  • Page 63: Interpreting The Vertical Fan Display

    The sounding beam is emitted and the information (target echoes) obtained by the beam appears in the corresponding sector as it appears on the sonar mode. The difference is that the training is performed only in vertical direction. It forms a sounding area of a half-circle (like a slice of watermelon) to observe a vertical section of underwater conditions.
  • Page 64 3.13.2 Sample echo displays Port-starboard picture (bottom) You can see fish echoes at the center-right of the screen. The bottom is displayed wider as the distance from the ship’s position increases. Therefore, it may be difficult to discriminate bottom fish. When ship passes over fish schools The sounding beam is directed fore-aft and the display is off-centered* to present a wider view of the area forward of the ship.
  • Page 65 This is an example of net hauling display. The location of the net is indicated clearly. FORE Figure 3-20 Net hauling and sonar picture False echo In shallow water (depth less than 100 m) detection, unwanted echoes shown in the figure may appear.
  • Page 66 3.13.3 Horizontal/vertical fan display Press the key to display the horizontal/vertical fan display. Vertical fan Cursor data bearing cursor B156˚ Own ship marker Train position Cursor Horizontal Display (main window) Figure 3-22 Horizontal/vertical fan display The horizontal display appears in the main window; the vertical fan display in the sub window. The displays are independent of each other so you can adjust them as desired.
  • Page 67 SECTOR control For the vertical fan display: When the display sector is 6° (minimum) the tilt angle of the horizontal and vertical fan modes are interlocked and each transmission on the horizontal display is reflected on the vertical fan display. The message TILT ANGLE MONITOR WINDOW momentarily appears on the screen and the vertical bearing cursor disappears.
  • Page 68 (This page intentionally left blank.) 3-18...

  • Page 69: Echo Sounder Mode

    4. ECHO SOUNDER MODE Operational Overview The figure below shows the typical echo sounder mode operating sequence. Select display sector. Turn on the power. Adjust gain. Lower the transducer. Select echo sounder mode. Set range Set picture advance speed. Figure 4-1 Control panel Set tilt angle.

  • Page 70: Typical Echo Sounder Display

    Cursor Range Bottom echo 6.5 m Depth (When the tilt angle is 90 deg., the depth measured by this sonar is displayed inside a rectangle.) Tilt angle indicator Bearing (Shows tilt angle of transducer.) indicator (Shows train Tilt angle direction.)

  • Page 71: Selecting The Range

    Selecting the Range The [RANGE] control selects the detection (display) range, in 15 settings. Select the range according to either the fish species being searched or the depth desired. Each time the control is operated the newly selected range briefly appears in large characters at the screen top. Range is permanently displayed at the top right-hand corner.

  • Page 72: Train Direction

    Train Direction The sounding beam may be directed toward fore, aft, port or starboard. Operate the [TRAIN] control to select sounding beam direction. Each setting on the control is an increment of 6 . The train indicator at the top of the screen shows training direction: 0 , fore direction; 90 , starboard direction;...

  • Page 73: Measuring Range By Cursor

    Measuring Range by Cursor Use the cursor to display the range from own ship to the cursor location. Use the Omnipad to place the cursor where desired. The range to the cursor appears at the upper left-hand corner of the screen. : Range Figure 4-4 How to measure range with the cursor Event Marker...

  • Page 74: Inscribing The Event Marker

    4.8.1 Inscribing the event marker 1. Operate the Omnipad to place the cursor on the location desired for an event marker. 2. Press the [EVENT] key to inscribe the event marker. "Previous event marker" "Latest event marker" Figure 4-5 How to inscribe, delete the event markers 4.8.2 Deleting all event markers All event markers can be erased from the screen as follows:...

  • Page 75: Range Marker

    The sonar operator will be quite inconvenienced if these echoes are directly displayed on the screen, since he won’t be able to judge the actual size of the target from the size of echoes displayed on the screen.
  • Page 76 MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES. COLOR CLUTTER A-SCOPE : SELECT 3. Press to select TVG DISTANCE and press 4. Press to adjust TVG distance. Distance Setting Meters Feet Passi/braza Hiro 5. Press to close the dialog box and return the ES menu. 6.
  • Page 77 4.10.2 Finding echo strength (A-scope display) The A-scope display shows echoes at each transmission with amplitudes and tone proportional to their intensities on the right 1/4 of the screen. It is useful for estimating the kind of fish school and bottom composition. 1.

  • Page 78: Echo Sounder Menu Overview

    4.11 Echo Sounder Menu Overview This section presents an overview of the items on the ES menu. 1. Press the [MENU] key to open the menu. 2. Press to select MENU and then press MENU TVG LEVEL TVG DISTANCE GAIN ADJUST RES.
  • Page 79 RES. COLOR: Sets transfer characteristics of input signal level versus display echo level. Echo strength is emphasized in order of CUBE, SQUARE, LINEAR, LOG. You can see the characteristics of each by watching the color bar as you change the setting. The default setting is LOG.
  • Page 80 (This page intentionally left blank.) 4-12...

  • Page 81: Menu Operation

    5. MENU OPERATION This chapter provides menu operating information on menus not previously discussed: COM1, COM2, PRESET (or SHORT-CUT, depending on the setting of CUSTOM KEY on the SYSTEM SETTING 1 menu) and SYS (System) menu. COM1 Menu 1. Press the [MENU] key to open the menu. 2.

  • Page 82: Com1 Menu Description

    For operation in shallow waters, select the Tx rate which displays the second reflection from the bottom between the sea surface and bottom. For use of an external video sounder or sonar, select EXT. INT REJECT: Turns the interference rejector on or off (default setting). For details, see paragraph 3.11.2 on page 3-11.

  • Page 83: Com2 Menu

    COM2 Menu 5.2.1 Displaying the COM2 menu 1. Press the [MENU] key to open the menu. 2. Press ▲ to choose MENU, and then press ◄ or ► to choose COM2. MENU DELETING TRACK WHITE MARKER SIG LEVEL COLOR BKGD COLOR BEARING READOUT : SELECT 5.2.2...

  • Page 84: Short-Cut Menu, Preset Menu

    Short-cut Menu, Preset Menu These menus program the CUSTOM MODE keys [1], [2] and [3], and one of the menus appears according to the setting of CUSTOM KEY on the SYSTEM SETTING 1 menu. Short-cut key: One-touch activation of corresponding dialog box. This is the default setting. Preset key: One-touch setup of mode, sector, train, range, tilt and speed controls.
  • Page 85 CUSTOM KEY EMPHASIS MODE ETA MARK : SELECT 6. Press to select CUSTOM KEY. ** SYSTEM MENU ** SYSTEM SETTING: RANGE-SONAR MODE RANGE-VERTICAL MODE RANGE-E/S MODE RANGE-TRACK MODE COLOR PALETTE LANGUAGE SYSTEM BACKUP LOAD BACKUP DATA HEADING OFFSET, DRAFT OFFSET...

  • Page 86: Preset Key

    7. Press to select PRESET KEY or SHORT-CUT KEY as desired. 8. Press the [MENU] key twice to register your selection and close the menu. 5.3.2 Preset key 1. Select PRESET KEY following the procedure in paragraph 5.2.1 on page 5-3. 2.
  • Page 87 5.3.3 Short-cut key The default settings are key [1], interference rejector; key [2], signal level, and key [3], background color. The operator may change their functions as desired. Note: In the combination modes the short-cut key operation is only possible from the main window.
  • Page 88 VERTICAL SEARCH FUNCTION When you find a target of interest on the horizontal display, simply press the function key programmed for VER. SEARCH to get a cross-sectional view of the vertical plane. This mode is useful for evaluating fish school concentration and location of the targeted fish school or for navigation purposes.

  • Page 89: Sys Menu

    MENU, and then press 3. Press to select GO TO SYS MENU. 4. Press to select YES. ** SYSTEM MENU ** SYSTEM RANGE-SONAR MODE RANGE-VERTICAL MODE RANGE-E/S MODE RANGE-TRACK MODE COLOR PALETTE LANGUAGE SYSTEM BACKUP LOAD BACKUP DATA...

  • Page 90: System Setting 1 Menu Description

    SYSTEM SETTING 1 menu 1. Display the SYSTEM menu and press 2. Press 3. Press to MENU. 4. Press to select “1.” MENU POSITION TRACK CURRENT DATA HEADING INDICATION : TRUE NORTH MARK CSE DATA NAV DATA TVG CORRECTION UNIT TEMP TARGET L/L CUSTOM KEY...
  • Page 91 HEADING INDICATION: Selects heading indication format, true (default setting) or azimuth, for the echo sounder and vertical fan modes. The default setting is TRUE. Requires heading data. NORTH MARK: Turns the north marker on or off (default setting). Requires heading data. When turned on, the bearing scale shows bearings in cardinal points (N, S, E, W) and half-cardinal points (NE, NW, SE, SW).

  • Page 92: System Setting 2 Menu Description

    SYSTEM SETTING 2 menu description MENU STABILIZER AUTO RETRACTION SPEED ALARM/MESSAGE : SWEEP INDICATOR SOUNDOME SERIAL NO : -999 DEFAULT SETTING MAXIMUM ALLOWABLE SPEED IS 15 KNOTS WHILE SOUNDDOME IS BEING RETRACTED. IF VESSEL HAS RAPID ACCELERATION CAPABILITIES, AUTO RETRACTION SETTINGS OF 10-12 KNOTS ARE MANDATORY TO AVOID CATASTROPHIC DAMAGE TO SOUNDOME ASSY.
  • Page 93 SPEED ALARM MESSAGE: Turn on (default setting) to display speed alarm message and sound the audio alarm when ship’s speed exceeds allowable speed for a given transducer operation. The audio alarm can be silenced with the [R/B] key. [ ] pressed to lower transducer Speed above 15 kts Transducer being lowered Speed over 15 kts...
  • Page 94 DEFAULT SETTING: Select YES and press the [MENU] key to restore all default system menu settings. Several beeps sound while default settings are being restored and then normal operation is restored. ** FACTORY SETTING ** ARE YOU SURE? NOTE: ALL THE SYSTEM SETTING WILL BE CHANGED TO FACTORY SETTING.
  • Page 95 5.4.2 Sonar (horizontal) mode range settings The user may preset horizontal mode ranges as desired. 1. Select RANGE-SONAR MODE at the SYS menu and then press TRACK DISP DEFAULT SETTING : 2. Press to select range number desired. 3. Press to set range.
  • Page 96 5.4.3 Vertical fan mode range settings As with the horizontal mode, the user may preset the vertical fan mode’s ranges. 1. Select RANGE-VER MODE at the SYS menu and then press DEFAULT SETTING : 2. Press to select range number desired. 3.

  • Page 97: Echo Sounder Mode Range Settings

    5.4.4 Echo sounder mode range settings As with the horizontal and vertical fan modes, the user may preset the echo sounder mode’s ranges. 1. Select RANGE-E/S MODE at the SYS menu and then press DEFAULT SETTING : 2. Press to select range number desired. 3.

  • Page 98: Track Range Settings

    5.4.5 Track range settings You may choose the video plotter display scale range as follows. 1. Choose RANGE-TRACK at the SYS menu and then press ►. DEFAULT SETTING : 2. Press ▲ or ▼ to choose range number desired. 3. Press ◄ or ► to set. 4.

  • Page 99: Color Palette

    5.4.6 Color palette The color palette lets the user change the color of echoes, background, text and menu as desired. Cursor ECHO Arrow BKGD TEXT BKGD1 COLOR : DEFAULT SETTING : : SELECT 1. Press to place the cursor and arrow on the item to change. Pressing arrow and cursor from left to right and top to bottom.

  • Page 100: System Backup

    5.4.7 Language Menu language can selected from among the languages shown in the Language menu and the default language is English. LANGUAGE: : CHANGE 5.4.8 System backup User settings can be backed up with the menu item SYSTEM BACKUP. ARE YOU SURE? NOTE: OVERWRITE PREVIOUS BACKUP DATA.

  • Page 101: Transducer Frequency Adjustment

    5.4.10 Transducer frequency adjustment If the CH-250 is receiving interference from a video sounder or other sonar on board your ship, adjust the frequency of the CH-250’s transducer to reduce the interference. FREQ SHIFT : CHANGE Figure 5-21 TX frequency adjustment menu 5.4.11 Demonstration mode...

  • Page 102: Restoring All Default Settings

    5.4.12 Restoring all default settings The item DEFAULT lets you restore all default menu settings. Select YES and press the [MENU] key to restore all default settings. Note that settings stored in SYSTEM BACKUP are not disturbed. ARE YOU SURE? NOTE: RESET ALL THE SETTINGS INCLUDED IN SYSTEM MENU TO DEFAULT.

  • Page 103: Maintenance, Troubleshooting

    6. MAINTENANCE, TROUBLESHOOTING This chapter provides information necessary for keeping the equipment in good working order. Preventive Maintenance Check the following points monthly. Check all cables. If damaged, replace. Check connectors at rear of each unit. Clean if necessary. Check earth of each unit. Clean if necessary. Check voltage of ship’s mains to be sure it is within the equipment’s power rating.

  • Page 104: Hull Unit Maintenance

    Hull Unit Maintenance 6.3.1 Lubrication Grease the raise/lower screw shaft once a year. Also, grease the raise/lower main shaft (upper part of the grease cotton retainer) twice a year. These parts can be accessed by removing the raise/lower drive assembly cover. 6.3.2 Manually raising, lowering transducer 1.

  • Page 105: Transducer Maintenance

    Transducer Maintenance When the ship is dry-docked remove marine growth from the transducer with fine sandpaper or a piece of wood. CAUTION Do not paint the transducer face. Loss of sensitivity will result. Do not use plastic solvents to clean the transducer.

  • Page 106: Troubleshooting

    Debris may be on sea surface. Reject unwanted noise with the interference rejector on the COM1 menu. Picture does not Problem in tilt mechanism or control line. Contact a FURUNO agent or change when tilt angle dealer for advice. is changed. (Bottom is...

  • Page 107: Error Messages

    6.7 Error Messages The table below shows the error messages which may appear on the display. All error messages are accompanied by an audio alarm, which you may silence with the [R/B] key. Message Hull Unit HULL UNIT POWER OFF (CHECK BREAKER AND FUSE.) PRESS R/B KEY TO SILENCE ALARM.

  • Page 108: Diagnostics

    The program numbers of the MAIN and PANEL programs appear at the top of the display. The ROM, RAM, VRM, NMEA and PANEL CPU are checked for proper operation and the results displayed as OK or NG (No Good). For NG contact a FURUNO agent or dealer for advice.
  • Page 109 TRAIN shows a figure between 355-359 if normal. NG appears in case of train error. TEST COUNT shows the number of times the test has been consecutively executed. At the bottom of the screen there are two major groups of zeroes (0), and they represent the keys and controls on the control panel and remote controller.

  • Page 110: Test Pattern

    Test Pattern A test pattern can be displayed to check for proper display of colors. 1. Press the [MENU] key to open the menu. 2. Press to select MENU, and then press 3. Press to select GO TO SYS MENU. 4.

  • Page 111: Menu Tree

    MENU TREE [MENU] key COM1 menu COM2 menu HORZ menu VERT menu ES menu (When SHORT-CUT KEY is selected at SYSTEM SETTING 1 menu.) SHORT-CUT menu PRESET menu (Default setting) (CONTINUED ON NEXT PAGE) TX POWER ( MAX , MIN) PULSELENGTH ( LONG , SHORT) TX RATE (EXTERNAL, 1-10;...
  • Page 112 SYSTEM SETTING 1 SYSTEM SETTING 2 RANGE-SONAR MODE (all default ranges) 60 kHz (min. range: m, 10: ft, 40; fa, p/b, hiro, 5. max. range: m , 1600; ft, 5000, 88 KHz (min. range: m, 10: ft, 40 ; fa, P/B, Hiro, 5; max. range: m, 1200; ft, 4000;...

  • Page 113: Specifications

    FURUNO SPECIFICATIONS OF 10.4 INCH COLOR LCD SEARCHLIGHT SONAR GENERAL Display system Transmit frequency CH-250 CH-250S Output power Range (factory setting) Range 60 kHz 1200 1000 1600 1200 DISPLAY/ CONTROL UNIT Display Picture color Display mode Combination display Alphanumerical indication Range, Sensitivity, TVG, Tilt angle, Interference rejection...
  • Page 114 80 120 160 200 250 300 400 500 600 800 1200 1600 80 120 160 200 250 300 400 500 600 800 1000 6° to 180°, 12° step 0° to 180°, 6° step Normal: 3°, High speed: 6° 360°, 6° step SP - 2 CH-250/250S E1316S01L 110408...
  • Page 115 Max. 16.7/8.2-7.7 A, 200-246 VA 110/220 VAC, 13 A, 1 phase, 50/60 Hz -15°C to +55°C (Soundome: 0°C to +35°C) 95% or less at +40°C IPX5 IPX2 N3.0 (panel), 2.5GY5/1.5 (chassis) N3.0 SP - 3 CH-250/250S 17° 13° 9° 9° 8° E1316S01L 110408...
  • Page 116 This page is intentionally left blank.

  • Page 117: Index

    INDEX AGC ...5-2 A-scope display ...4-9 Automatic tilt...2-18 Background color...5-2 Backup data loading ...5-20 saving ...5-20 BRILL control...1-5 Clutter echosounder mode ... 4-11 horizontal mode...2-18 vertical fan mode...3-13 Color palette ...5-19 Colors background ...5-3 display...5-3 COM1 menu ...5-1 COM21 menu ...5-3 Control description...1-1 Course data...
  • Page 118 replacement of fuse...6-3 transducer...6-3 MENU key ...1-7 Menu tree ... M-1 Navigation data... 5-11 North marker... 5-11 Position display format...5-10 POWER switch ...1-3 PRESET menu ...5-6 Pulselength...2-9 R/B key echo sounder mode ...4-7 horizontal mode...2-7 vertical fan mode...3-9 Range echo sounder mode ...4-3 horizontal mode...2-3 presetting for echo sounder mode...5-17 presetting for horizontal mode...5-15...

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Ch-250s

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