Instruction/ maintenance manual of the product MODEL CSH-73 Furuno
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COLOR SCANNING SONAR MODEL CSH-73.
Your Local Agent/Dealer Your Local Agent/Dealer 9-52 Ashihara-cho, 9-52 Ashihara-cho, Nishinomi y a, Ja p an Nishinomi y a, Ja p an Tele p hone : Tele p hone : 0798-65-2111 0798-65-2111 Telefax : Telefax : 0798-65-4200 0798-65-4200 FIRST EDITION : FIRST EDITION : OCT.
i i i i i i i i i i i i i i SAFETY INSTRUCTIONS CAUTION Use the proper fuse. Use of a wrong fuse can result in fire or permanent equipment damage. Do not use the equipment for other than its intended purpose. Personal injury can result if the equipment is used as a chair or stepping stool, for example.
ii T ABLE OF CONTENTS FOREWORD A W ord to CSH-73 Owners ...................................................................................................... v Features .................................................................................
iii FUNCTION KEYS Programming the Function Keys ........................................................................................... 6-1 Replaying a Function Key ..................................................................................
iv SELF TESTS Opening the Self T est Menu ................................................................................................ 11-1 Self T est Description ....................................................................................
v FOREWORD A Word to CSH-73 Owners Congratulations on your choice of the FURUNO CSH-73 Color Scanning Sonar . W e are confident you will see why the FURUNO name has become synonymous with quality and reliability . For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for qual- ity marine electronics equipment.
vi System Configuration STANDARD OPTION REMOTE CONTROL BOX CSH-116 DISPLAY UNIT CSH-731 REMOTE DISPLAY CSH-106 SUB DISPLAY CSH-736 STEP-DOWN TRANSFORMER PT-400 INTERFACE UNIT CS-120A IE/S NTERFACE UNI.
1-1 CONTROL DESCRIPTION Control Layout on Display Unit and Remote Control Box RECALL MEMO HIST E/S NORM - + F3 F2 F1 ON OFF + - GAIN + - RANGE TILT WIDTH AUTO TILT WIDTH AUTO TRAIN EVENT1 NET COURSE F.
1-2 Main Panel RECALL MEMO HIST E/S NORM - + F3 F2 F1 ON OFF + - GAIN + - RANGE TIL T WIDTH AUTO TIL T WIDTH AUTO TRAIN EVENT1 NET COURSE FISH ESTI- MA TE1 EVENT2 T ARGET LOCK OFF- CENT ESTI- MA TE2 D.
1-3 Control Function NORM, E/S, HIST (Mode keys) Select display mode: NORM, normal sonar picture; E/S, Echosounder combination; HIST, Historical display. Lamp above a key lights to show current selection. RECALL, MEMO RECALL: Replays saved picture. MEMO: Saves picture to memory card or internal memory.
1-4 Sub Panel 1 RECALL MEMO HIST E/S NORM F4 F5 F3 F2 F1 ON OFF POWER TRANSDUCER CARD REPLAY COLOR NET REPLAY TX HELP END MENU MEMORY CARD DRIVE CARD EJECT BUTTON Figur e 1-3 Sub panel 1 Sub panel 1 control description Control Function MENU Opens/closes the menu.
1-5 Sub Panel 2 (data setting window) SIGNAL DELETE MK TVG•TX ES SONR•BEAM AUTO ALM•AUDIO NEAR 7 MEDIUM 8 FAR 9 CYCLE 7 PL 8 OUTPUT 9 TVG TX + + + + + + – – – – – – h g OPER P-SET (TOGGLE) Setting change keys Change control setting. Item selection keys Select item.
1-6 Main Item Item Setting Range Description Normal Setting Main Sub SIGNAL SIGNAL PROCESS NL 0–10 Rejects unwanted echoes. 3 AGC 0–10 Automatically reduces receiver gain against strong echoes such as seabed. Adjust so fish echo is displayed near seabed.
1-7 n i a M m e t I m e t I g n i t t e S e g n a R n o i t p i r c s e D l a m r o N g n i t t e S n i a Mb u S M A E B • R N O S R A N O S R A N O S2 – 1 r o , r a n o s e l g n i s r o f " 1 " e s o o h C . r a n o s l a u d r o f " 2 " 1 T F I H S - F2 – 1 " 1 " e s o o h C .
1-8 Remote Control Box 1 2 3 DISP SELECT DATA d c d EVENT TGT LOCK ESTIMATE 1 NET COURSE FISH OFF- CENT TX 1 23 4 FUNCTION 5 – + RANGE + – GAIN SHOOT MEMO RECALL AUTO AUTO VERT SCAN TILT TRAIN SCAN DEPTH Each press displays water temperature or depth at screen center for about five seconds.
2-1 OPERA TIONAL OVERVIEW T urning the Power On/Off Turning the power on Press the ON key on the main panel. The lamp above the key should light. If it doesn’t press the TX switch on sub panel 1. T urning the power off Retract the transducer with the c key and then press the OFF key on the main panel.
2-2 Selecting a Display Mode The CSH-73 provides three display modes: normal sonar pic- ture, echo sounder (E/S) combination, and history display com- bination. Those modes may be selected with the NORM, E/S and HIST keys. T able 2-1 Display mode description Mode Description The sonar picture appears over the entire screen.
2-3 Selecting a Display Range Operate the RANGE control to select a display range. The range selected appears at the top center of the screen. Setting the T ilt Angle The tilt angle shows the direction to which the sound wave is emitted.
2-4 Adjusting the Gain The GAIN control adjusts receiver sensitivity (gain). Adjust it so fish echoes are clearly displayed with minimal noise on the screen.
3-1 FINE TUNING THE PICTURE This chapter provides the information necessary for tuning the sonar picture. All operations are performed on sub panel 2 (data setting window).
3-2 100 m Near Far Med 400 m 25 m Figur e 3-2 Principle of TVG The TVG is also used to suppress unwanted echoes and noise which appear in a certain range area on the screen such as sea surface reflections and cruising noise. T o set TVG properly , do the following: How to adjust TVG 1.
3-3 Suppressing Seabed T ail AGC (data setting window: SIGNAL, SIGNAL PROCESS) The AGC functions to automatically reduce the receiver gain only against strong echoes such as the seabed or a large fish school. Since weak echoes remain unaffected, a small fish school becomes easier to detect.
3-4 Suppressing Seabed and Sea Surface Reflections in Shallow W aters Data setting window: TVG•TX, OUTPUT In shallow fishing grounds with hard or rocky bottom, seabed reflections often interfere wit.
3-5 Interference from other sonar Cruising (propeller) noise of own ship Cruising noise from other boat Figur e 3-4 Forms of interfer ence Identifying noise source T o eliminate noise effectively , you should first identify the noise source as follows: 1.
3-6 Inter- ference Figur e 3-5 How CYCLE works Note: When the sonar is used in shallow water with the range set between 60 m and 200 m and Tx cycle at “9”, seabed reflec- tions caused by the 2nd-to-the-last transmission may appear on near ranges. Reduce the Tx cycle setting to “2” or “3” to sup- press them.
3-7 Adjusting Beamwidth Beamwidth can be adjusted at SONR•BEAM, BEAM on the data setting window . T able 3-1 Beamwidth adjustment menus Menu Application HOR Set to "0" for normal use.
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4-1 MARKS AND DA T A Marks, Data and Display Mode Normal display mode Figur e 4-1 Marks and data appearing in the normal display mode.
4-2 Figur e 4-2 Marks and data appearing in the normal display mode w/text Figur e 4-3 Marks and data appearing in the echo sounder conbination display mode Normal display mode w/text Echo sounder com.
4-3 Figur e 4-4 Marks and data appearing in the history display mode Permanently Displayed Marks and Data Range Data R Shows the range scale set with the RANGE control. Tilt Angle Data T ˚ Train Angle Data R0 Mark/Data Description The tilt angle appears below the range.
4-4 Mark/Data Description Shows own ship's present position. The direction of the arrow shows ship's heading. This mark moves with ship's movement in the true motion mode*.
4-5 Range Rings The range rings are inscribed at intervals of 1/4 of the range in use. Range ring data is also provided every two range rings. The range ring interval can be changed from 1/4 to 1/2 through the menu. Mark/Data Description Latest Fish Mark Fish Speed Mark Fish Mark These marks are inscribed on the screen by pressing the FISH key.
4-6 Ship's Track Mark* With gyrocompass or speed log connection, own ship's track is plotted by a solid line. The track length to display can be selected among 5, 10, 20 and 40 times the range.When the length of the line exceeds selected value the oldest part of the track is erased.
4-7 Mark Description Target Lock Mark* The target lock mark automatically tracks the fish school selected by the operator. This function requires speed and gyrocompass inputs. Net Shooting Mark Net Shooting Data Press the SHOOT key at the instant you shoot the net to display the net shooting mark on the display.
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5-1 USER MENU OVER VIEW Many functions are carried out through the menu system, which consists of the USER, SYSTEM, DA T A SET and INITIAL SET/ DA T A menus. The menu you will use most often is the USER menu. Menu How to open USER Press MENU. SYSTEM Press c and MENU together.
5-2 2. Operate the arrow keys in sub panel 1 to select a menu. As you move through the menu, each item, initially shown as blue on gray , reverses to gray on blue to show selection. For example, select the HIST DSP/GRPH menu. 3. Press the MENU key to display menu selected.
5-3 USER Menu Description T able 5-1 User menu description Menu Menu Item Description CARD UTILITY List Lists contents of memory card. Save Saves control and menu settings to memory card. Delete Deletes data from memory card. Initialize Formats memory card.
5-4 u n e Mm e t I u n e Mn o i t p i r c s e D C E V T N E R R U C c e V t n e r r u C / w c e V t n e r r u C / w c e V t n e r r u C / w r i D w o l F t n e r r u C r i D w o l F t n e r r u C .
6-1 FUNCTION KEYS Similar to the quick dialing function on a telephone, the five function keys (F1–F3) on the main panel record control and menu settings and replay them back exactly as programmed. The items you can program are gain, display mode, TX ON/OFF , USER menu, SYSTEM menu, DA T A SET menus and data setting win- dow .
6-2 FUNCTION KEY REGISTER 1 USER MENU Customized settings are registered to FUNCTION keys. Select key number with ↑ ↓ key and press MENU key. Press END key to return to sub menu. Figur e 6-2 REGISTER menu 5. Press the up or down arrow key in the sub panel 1 to select the function key to program, then press the MENU key .
6-3 Function Key Fine Tuning Fine Adjustment Item -4 -3 -2 - 1 0 1 2 3 4 5 TVG Near -3 -2 - 1 0 0 1 1 2 3 4 TVG Mid -3 -2 -1 0 0 0 1 1 2 3 TVG Far -3 -2 -1 0 0 0 0 1 1 2 Tx Cycle 0 0 0 0 0 0 0 0 0 0 Tx Beamwidth -3 -2 -1 0 0 0 0 0 0 0 Tx Power -2 -1 0 0 0 0 0 0 0 0 Saving Function Key Settings to a Memory Card 1.
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7-1 ADV ANCED LEVEL OPERA TION Finding Fish School Center When you want to find the center depth of a fish school, use the auto tilt function, which automatically scans the tilt angle within the selected width.
7-2 T racking a Fish School (target lock) T arget lock, which requires speed and heading inputs, automati- cally tracks an important fish school so that you wonít lose sight of it on the display screen. T wo types of target lock are avail- able: T arget Mark or Fish.
7-3 T arget lock mark appearance The size and thickness of the tar get lock mark indicates fish speed and tracking status, as shown below . Meaning T arget lock mark appearance Mark size indicates relative speed. Fast Medium Slow (More than 5 Tx cycles) (Up to 3 Tx cycles) Mark thickness shows tracking status.
7-4 4. Select T racking Method, and then press the [MENU] key . 5. Select method desired. 6. Press the [END] key several times to close the menu. T racking target lock mark 1. Operate the trackball to place the trackball mark on the fish school you want to track.
7-5 Setting target lock conditions 1. Open the sub panel 1. 2. Press the [MENU] key while pressing and holding down the down arrow key in sub panel 1. 3. Select T ARGET LOCK with the arrow keys. 4. Press the [MENU] key . SYSTEM MENU TARGET LOCK Tracking Method TGT Mark Fish Track Echo Color 8 Choose weakest echo to track.
7-6 Description of target lock items T rackingMethod Sets tar get lock function: tar get lock mark, fish or automatic. T rack Echo Color Sets minimum echo signal level to track. A fish school whose signal level is above the level set here is tracked. Fish Speed Limit Sets fish speed at which target lock is cancelled.
7-7 Detecting Fish Schools Aurally Sometimes you may be preoccupied with other tasks and unable to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This function enables you to monitor echoes from fish schools and seabed through the built-in speaker .
7-8 The Fish Alarm The fish alarm sounds an audible alarm when a fish echo above a preset strength enters an alarm zone. Y ou set parameters for the fish alarm at ALM on the data setting window . ON/OFF: T urn alarm on or off. Level: Set echo strength level which will activate the alarm.
7-9 Relocating Fish School for Easy Observation 1. Operate the trackball to place the trackball mark on the posi- tion where you want to relocate the own ship mark. 2. Press the OFF-CENT key . 3. T o move the own ship mark back to the screen center , press the OFF-CENT key again.
7-10 Comparing of Fish School Concentration Y ou can get an estimate of the volume of two fish schools by using the two ESTIMA TE keys. 1. Operate the trackball to place the trackball mark on a fish school, and then press the ESTIMA TE 1 key . The estimate mark appears on the fish school.
7-11 Measuring Fish School Speed T o ensure a good haul, it is important to estimate the direction and speed of the fish school before shooting the net. Y ou can do this with the FISH key . If the tidal current data is used together with fish speed data, you can determine the timing of the net shooting more ef ficiently .
7-12 Note 3: Each time the FISH key is pressed the latest fish mark and ship’ s speed mark change in the sequence shown below: Fish key pressed once: Fish key pressed twice: Fish key pressed three t.
7-13 Entering an event mark 1. Set the trackball mark where you want to place an event mark (latest event mark). 2. Press an EVENT key . The horizontal range, depth and bear - ing to the event mark appear at the bottom left corner of the screen. (35) Stored when EVENT key is pressed.
7-14 T rue Motion Display The relative motion display places the own ship mark at the screen center , and echoes from fish and the seabed move on the screen relative to own ship’ s movement. This means that even when the ship is dead in water , fish echoes move on the display .
7-15 Plotting Net Location Mark Before shooting net, you will decide the shoot timing consider - ing the water current direction, distance to fish school and mov- ing direction of the fish school. Use the net location mark as a guide to decide the timing.
7-16 Setting Distances Between Net Sonde T ransmitters T o accurately display the net shooting mark and net sonde mark position, the distance between transmitters must be correctly set. This is done on the DA T A SET menu. R0: Length of net from its end to transmitter1 in meters.
7-17 Observing Net Behavior W ith net sonde connection you can observe net behavior after the throwing of the net, on the echo sounder combination mode. Accurate depiction of net sonde position depends on proper set- ting of the distances between net sonde transmitters.
7-18 Port/Starboard, Horizontal Slice Displays The port/starboard display or horizontal slice display may be displayed by pressing the [HIST] key . The display shown de- pends on the setting of “HIST DSP/GRPH” in the USER menu.
7-19 Horizontal slice display 120 degrees of the picture in the horizontal direction is shown for a given depth (D) in the horizontal slice window at the bot- tom of the display .
7-20 T urning Marks, Data On/Off Y ou can turn marks and data on or off through the data setting window or the USER menu. T urning marks on/off through the data setting window (Sub Panel 2) Select DEL.
8-1 SA VING, REPLA YING PICTURE Y ou can save either the whole screen or the echo inside the esti- mate mark to the internal memory or a memory card. e v a S o t a t a Dd o h t e M g n i v a So t g n .
8-2 Saving the Picture 1. Press the MENU key to display the USER menu. 2. Select SA VE PICTURE. 3. Select item to save: Whole: Saves whole picture to memory card. Est MK: Saves echo inside the estimate mark to internal memory . (About 20 pictures can be saved.
8-3 Saving Net Shooting Data How net shooting data is saved The unit starts accumulating net shooting data when the SHOOT key is pressed. When net shooting is concluded by pressing the SHOOT key again, the echo inside the estimate mark and other net shooting data are saved to the internal memory .
8-4 Replaying Saved Data Whole picture or echo inside estimate mark 1. Press the RECALL key (on the main panel). 2. Press the right or left arrow key in sub panel 1 to select item to replay . The left arrow key selects older data (for example, data in memory card); the right arrow key newer (for ex- ample, data in internal memory).
9-1 INTERPRETING THE DISPLA Y Seabed Echoes When the tilt angle is set at 90 degrees with the sector center faced dead ahead, the pictures illustrated below will appear on the screen. The seabed echo is represented on the screen as a thick line which realistically shows the bottom contour .
9-2 Fish Schools A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of the fishes and the size of the mass how they are distributed. In the following figures, the same fish school is observed with two different tilt angles.
9-3 Sea Surface Reflections As ultrasonic pulses at both edges of the 180˚ sector beam are always emitted horizontally along the sea surface regardless of the tilt angle setting, sea surface reflections appear as a thick line extending across the own ship mark.
9-4 False Echo by Sidelobe An ultrasonic wave is emitted only in the direction set by the TIL T lever , however there are some emissions outside the main beam.
10-1 W ARNINGS Overvoltage W arning If the input voltage to this unit rises above 125 V AC, the over- voltage detection circuit activates, an alarm sounds and the mes- sage OVER VOL T AGE appears at the screen center . If this occurs, retract the transducer , turn the power of f and check the ship’ s mains voltage.
10-2 Breaker Power Supply Unit F Photo No.1580 Hull Unit Main Shaft Hand Crank Figur e 10-1 How to manually raise the transducer.
11-1 SELF TESTS The CSH-73 has various self tests to check it for proper opera- tion. If a test reveals equipment malfunction do not attempt to check inside the equipment. There are no user serviceable parts inside the equipment. Do not work inside the equipment unless totally familiar with electrical circuits.
11-2 Self T est Description Single test The ROM, RAM and other devices of the dis- play unit are checked once. Control is returned to the SELF TEST menu when the test is com- pleted. Figur e 1 1-2 Single test Continuous test The devices of the display unit are checked con- tinuously .
11-3 Panel test This test checks the keys of the main and sub panels and the remote control box. Press and release each key . Its on-screen location should display “1” when the key is pressed and “0” when released. T o escape from the test reset the power .
11-4 Gray test This test checks for screen distortion. T o escape from the test reset the power . GRAY TEST Figur e 1 1-6 Gray test SIO test This test checks for proper communication between the display unit and transceiver unit, and requires a jumper plug.
11-5 Interface Unit CS-120A Self T est 1. Open the cover of the interface unit. 2. Find DIP switch DP-1 on the lone circuit board. T urn switch #6 on to start the self test. The results of the check appear on the digital display beside the DIP switch.
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12-1 MAINTENANCE Do not work inside the equipment unless totally familiar with electrical circuits. Hazardous voltage which will cause death or serious injury exists inside the equipment. DANGER Display Unit Maintenance Keep magnets and cassette tapes away from the display unit.
12-2 Hull Unit Maintenance HULL UNIT Apply MOLYTONE grease #2 every six months. Dry dock ship and clean transducer face yearly. Apply single coat of "MARINE STAR 20 Mod (Red-N)" anti-foulant to transducer face to keep marine life off the transducer.
13-1 SPECIAL MENU DESCRIPTION SYSTEM Menu Description The SYSTEM menu can be displayed by pressing MENU and c together . For help, press the HELP key .
13-2 u n e Mm e t In o i t p i r c s e D K C O L T E G R A Te t a d p U d p S h s i F. t u o d a e r d e e p s h s i f f o l a v r e t n i e t a d p u s t c e l e S , s d n o c e s 0 3 , s d n o c e s 5 1 m o r f t c e l e s n a c u o Y .
13-3 u n e Mm e t In o i t p i r c s e D C E R T E N / S Ee v r u C r o l o C 1 S Er o l o c n o i t a t n e s e r p s u s r e v l e v e l o h c e s t c e l e S . 1 r e d n u o s o h c e r o f e v r u c s a s u o u c i p s n o c s a t o n e r a s e o h c e k a e W : r a e n i L g n i t a n i m i l e r o f l u f e s U .
13-4 DA T A SET Menu Description The DA T A SET menu can be display by pressing MENU and d together . For help, press the HELP key . u n e Mm e t In o i t p i r c s e D E V R U C R O L O C1 r a n o S .
13-5 u n e Mm e t In o i t p i r c s e D R O L O C E G N A H C1 r a n o S 2 r a n o S r e d n u o S o h c E s k r a M u n e M s m e t i e s e h t f o r o l o c e h t e z i m o t s u c n a c u o Y r a n o S t a h t e t o N . c t e , t s e u q e r r e s u o t g n i d r o c c a n o e g n a h c r o l o c y a l p s i d r o F .
13-6 u n e Mm e t In o i t p i r c s e D T O O H S T E N N A L P r e t e m a i D t e Ny r a s s e c e n r e t e m a i d n r u t s ' p i h s d e t a m i t s e s t e S f o n o i t c i p e d e t a r u c c a t e g o t , t e n g n i t o o h s r o f y b y a l p s i d n a c u o y h c i h w , k r a m n o i t a c o l t e n g n i t t e s e h T .
13-7 INIT SET/TEST Menu Description The DA T A SET menu can be display by turning on the power while pressing MENU key . The HELP key provides menu operating information. u n e Mm e t In o i t p i r c s e D J D A G N I D A E Ht s u j d A g n i d a e Hl l u h n o k r a m D A E H f o e l g n a n o i t a i v e d s t e S 5 1 s i n o i t a i v e d f I .
13-8 u n e Mm e t In o i t p i r c s e D T S E T O H C Et s e T y a l p s i Df o n o i t c e n n o c t u o h t i w t i n u y a l p s i d e h t s k c e h C . d e y a l p s i d s i n r e t t a p t s e t A . s t i n u r e h t o n o i t a r t s n o m e D.
A-1 MENU TREE USER Menu Event Mark 1 Event Mark 2 Fish Mark On Track Data Text Window ES Window Range/Bearing Heading Mark Range Rings Bearing Scale Auto Scan Width Auto Train Width Ship's Track .
A-2 DA T A SET Menu Setting range: 200-1000 m ON OFF Setting range: 0-3000 m Setting range: 0-1000 m Execute Execute Execute Execute Execute Execute Execute CHANGE COLOR DATA SET MENU Sonar 1 Sonar 2 .
A-3 INIT SET/TEST Menu Setting range: 0°-359° INIT SET/TEST MENU HEADING ADJ Heading Adjust NMEA 4800, 9600 bps Negative Positive Negative Positive EXT KP KP Out Polarity EXT KP Polarity Gray SIO Ex.
A-4 SYSTEM Menu 25log 30log 35log 40log F AR TVG Far TVG Curve SYSTEMMENU Setting range: 0 to 3 SIGNAL PROCESS Smooth Echo - - - Rng Smooth Echo - - - Cir Delete Color Setting range: 0 to 3 Setting range: 1 to 10 1.
A-5 Execute DEFAULTS Defaults HIST DISPLAY PRT/STBD Sample Net Shoot Mark Target Lock ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF INTERLOCK Tilt Range Event Mark Fish Mark SYSTEM MENU (Continued from pr.
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SP-1 SPECIFICA TIONS Model: CSH-73- M 150 (Freq.: 150 kHz) 180 (Freq.: 180 kHz) 1. GENERAL (1) Range, TX Cycle, Pulselength c i s a B e g n a R ) m ( e g n a R e l c y C X T ) c e s ( h t g n e l e s l u P ) c e s m ( r e t n e c f f F O " F F O " " N O " r e t n e c f f O 5 75 7 - 00 0 1 - 02 3 .
SP-2 (3) T ransceiver T ransmitter: High power MOS FET amplifier with 10-step power reduction switch Receiver: Low noise superheterodyne, continuously scanning beam forming, TVG, AGC, signal/processing, interference rejecter , horizontal vertical beam switching.
SP-3 *Own ship’ s position (latitude/longitude) Net sonde data (net depth, distance to seabed, water temperature, sinking speed of net) (6) Features Custom mode, interference rejector , after glow ,.
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IN-1 INDEX A AGC ................................................................ 3-3 2AGC .............................................................. 3-3 AUDIO ........................................................... 7-6 AUTO TIL T ............
IN-2.
An important point after buying a device Furuno MODEL CSH-73 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Furuno MODEL CSH-73 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Furuno MODEL CSH-73 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Furuno MODEL CSH-73 you will learn all the available features of the product, as well as information on its operation. The information that you get Furuno MODEL CSH-73 will certainly help you make a decision on the purchase.
If you already are a holder of Furuno MODEL CSH-73, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Furuno MODEL CSH-73.
However, one of the most important roles played by the user manual is to help in solving problems with Furuno MODEL CSH-73. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Furuno MODEL CSH-73 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
