Furuno 841 MARK-2 Operator'S Manual Download Page 1

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MARINE RADAR

MODEL

MODEL 841 MARK-2

Summary of Contents for 841 MARK-2

Page 1: ...MARINE RADAR MODEL MODEL 841 MARK 2...

Page 2: ...p h o n e 0 7 9 8 6 5 2 1 1 1 Te l e f a x 0 7 9 8 6 5 4 2 0 0 Yo u r L o c a l A g e n t D e a l e r A l l r i g h t s r e s e r v e d P U B N o O M E 3 4 4 4 0 M O D E L 8 4 1 M A R K 2 H IM A F I R...

Page 3: ...regarding these safety instructions please contact a FURUNO agent or dealer The level of risk appearing in the notices is defined as follows SAFETY INSTRUCTIONS This notice indicates a potentially ha...

Page 4: ...rking on the antenna unit Serious injury or death can result if someone falls from the radar antenna mast Stay away from transmitting antenna The radar antenna emits mi crowave radiation which can be...

Page 5: ...mains switch board before beginning the installation Post a sign near the switch to indicate it should not be turned on while the equipment is being installed Fire electrical shock or serious injury c...

Page 6: ...Echo Trails 16 2 22 The Navigation Data Display 16 2 23 Echo Stretch 17 2 24 Selecting Unit of Measurement for Range 18 2 25 Selecting Bearing Reference 18 2 26 Watchman 18 2 27 Erasing the Heading M...

Page 7: ...would appreciate hearing from you the end user about whether we are achieving our purposes Thank you for considering and purchasing FURUNO equipment Features Your radar has a large variety of function...

Page 8: ...8 Tuning Automatic or manual 9 Receiver front end MIC Microwave IC 10 Bandwidth 7 MHz 11 Duplexer Circulator with diode limiter Display Unit 1 Indication system PPI raster scan 2 Display 8 inch diago...

Page 9: ...32 F or above 50 C 122 F 13 Humidity Relative humidity 95 or less at 40 C 14 Waterproofing Display unit IEC Pub no 529 IPX5 Antenna unit IEC Pub no 945 class X 15 Power supply power consumption 12 V o...

Page 10: ...T o N e d o C y t Q s k r a m e R 1 t l o B x e H 4 0 3 S U S 5 2 x 0 1 M 8 0 3 2 6 8 0 0 0 4 2 r e h s a W t a l F 4 0 3 S U S 0 1 M 1 3 1 4 6 8 0 0 0 4 3 r e h s a W g n i r p S 4 0 3 S U S 0 1 M 1...

Page 11: ...c e R 2 6 R P 4 8 4 3 1 0 0 0 0 1 C A V 0 0 1 5 8 4 3 1 0 0 0 0 C A V 0 1 1 6 8 4 3 1 0 0 0 0 C A V 0 2 2 7 8 4 3 1 0 0 0 0 C A V 0 3 2 2 r e z z u B l a n r e t x E 6 3 1 3 0 P O 3 4 4 6 8 0 0 0 0 1...

Page 12: ...rter AD 100 Equivalent to NMEA0183 Option IEC 1162 IEC 1162 In Out In Fluxgate Heading Sensor C 2000 Antenna Unit Remote Display FMD 811 External Alarm Buzzer OP03 136 Rectifier PR 62 10 2 31 2VDC 115...

Page 13: ...is needed to deter mine the one way distance to the target This radar automatically takes this into account in making the range calculation 1 4 How Radar Determines Bearing The bearing to a target fou...

Page 14: ...How radar works A B C D Own ship radar D A B C Heading line Targets Own ship in center Range and bearing of a target relative to own ship are readable on the PPI A Bird s eye view of situation B Radar...

Page 15: ...dar range Plots targets trails Opens closes menus Turns the VRM on off Turns the EBL on off ENT MENU ECHO HM OFF RANGE TONE BRILL EBL VRM TRAIL RINGS GUARD OFF CENTER DISP MODE ST BY TX POWER Erases h...

Page 16: ...en the heading sig nal is restored to warn the operator that the readout may be unrealiable The warning may be erased by pressing the DISP MODE key 2 3 Turning the Radar On and Off Turning the radar o...

Page 17: ...navigating in or around crowded harbors select a short range to watch for possible collision situations If you select a lower range while on open water increase the range occasionally to watch for ves...

Page 18: ...e background noise on the display How to adjust STC suppressing sea clutter Echoes from waves can be troublesome covering the central part of the display with random signals known as sea clutter The h...

Page 19: ...te In addition to reducing clutter the FTC can be used in fine weather to clarify the pic ture when navigating in confined waters How ever with the circuit activated the receiver is less sensitive The...

Page 20: ...asure the range to a target three ways by the range rings by the cursor and by the VRM Variable Range Marker By range rings Press the RINGS key to display the range rings Count the number of rings bet...

Page 21: ...BL on the target If it tracks along the EBL as it approaches the screen center it may be on a collision course with your vessel 2 12 Menu Operation The menu consisting of 6 sub menus mostly contains l...

Page 22: ...uard zone or OUT alarm to targets exiting the guard zone 4 Selects VRM unit nm km or sm 5 Selects EBL reference relative or true 6 Selects ranges to use Select range to enable disable and press ENT ke...

Page 23: ...n one of the sequences shown below depending on equipment connected and menu settings Note In the window display mode the DISP MODE key reselects zoom area To select the display mode while in the wind...

Page 24: ...es a dashed circle and the cursor can be moved indepedently To reselect area to zoom press ENT or DISP MODE and follow steps 2 and 3 Figure 2 12 How to select the area to zoom 2 15 Selecting the Prese...

Page 25: ...rd alarm can be set to sound on tar gets entering guard in or exiting guard out the guard zone Select type of guard zone as follows 1 Press the MENU key to display the menu 2 Select Mode Function and...

Page 26: ...y create the guard zone to set G IN 3 Drag cursor to bottom right corner of zone and press GUARD 4 Guard zone completed G IN Guard zone Drag cursor here Figure 2 14 How to set a guard zone 2 17 Suppre...

Page 27: ...be selected to short or long on the 1 5 and 3 nautical mile ranges 1 Press the MENU key 2 Select P L Int Noise Rej ES and press the ENT key 3 Select Pulselength to SHORT or LONG 6 Press ENT and MENU...

Page 28: ...elected When the elapsed time display freezes at 60 seconds all but the latest one minute of trails are erased and then trailing continues Continuous trail The maximum continuous trail time is 99 minu...

Page 29: ...of GPS Loran C and other 4 Select Nav Data Disp to OFF or ON 5 Select Pos Disp Mode to L L latitude and longitude or TD Loran C 6 Select unit of depth measurement to meters fathoms or feet 7 Select un...

Page 30: ...ference Bearing can be displayed relative to north relative bearing or relative to true north true bearing as follows True bearing re quires heading sensor input 1 Press the MENU key 2 Select Mode Fun...

Page 31: ...heric pressure appears in graph form on the navigation data display during stand by If your navigation aid can output data in NMEA 0183 data format your CAUTION The barometer and depth displays are in...

Page 32: ...d longitude or the range and bearing from own ship to the cursor You can select the indication desired by pressing the HM OFF key 2 32 Visual Alarm Indications This radar display various visual alarms...

Page 33: ...pe diffuses most of the radiated energy A ship whose hull is made of conducting materials such as steel will return a rela tively strong echo As an aid to navigation radar can be a very valuable tool...

Page 34: ...earing Resolution Bearing resolution is a measure of the ca pability of a radar to display as separate tar gets the echoes received from two targets which are at the same range and are close together...

Page 35: ...c tual range of the target as shown in Figure 3 4 Multiple reflection echoes can be re duced and often removed by decreasing the sensitivity or properly adjusting the STC Figure 3 4 Multiple echoes Si...

Page 36: ...dar can not show targets which are below the hori zon show a target which is hidden by a larger one see around corners for example sea wall distinguish between two targets which are very close togethe...

Page 37: ...ally familiar with electrical circuits and service manual should work in side the display unit or scanner unit WARNING Hazardous voltages Can shock burn or cause death Only qualified person nel should...

Page 38: ...e l C e c n a m r o f r e p n i p o r d r e t a w h s e r f a h t i w e m o d a r g n i n a e l c d e d n e m m o c e r y l n o e h T e s u t o n o D l o h o c l a s i t n e g a n a c y e h t s t n e...

Page 39: ...a h r a d a r e h t u o y d n a p u d e m r a w e h t d e s s e r p o t y e k X T Y B T S t i m s n a r t t o n s e o d a n n e t n a e h t e t a t o r t i n u a n n e t n a n i e b y a m m e l b o r...

Page 40: ...press a key Its corresponding location on the display lights in black if the key is operating prop erly 4 To escape the test press the MENU key The ROM and RAM are automatically checked If NG No Good...

Page 41: ...installation and adjustments 5 1 Antenna Unit Installation Siting handling considerations The antenna unit is generally installed either on top of the wheelhouse or on the radar mast on a suitable pla...

Page 42: ...Figure 5 3 Assembling the sailboat mast mounting bracket option FLAT WASHER SPRING WASHER M10 x 25 HEX BOLT PLATFORM 4 12 HOLES CABLE ENTRY SHIP S BOW Figure 5 4 Antenna Unit cover removed Flat washer...

Page 43: ...rs we recommend installing it an enclosed cabinet for maximum pro tection against the marine environment The temperature and humidity of the mounting location should be stable and moderate No LCD can...

Page 44: ...ent deviation of a magnetic com pass standard compass 0 7 meters and steering compass 0 5 meters Mounting procedure The display unit is designed to be mounted on a tabletop 1 Using the hanger as a tem...

Page 45: ...e here Ground terminal Connect ground wire between here and ship s ground OPTION connector Connect navaid video sounder etc here CAUTION Tighten the boot band securely to ensure water tightness See th...

Page 46: ...0 m cable assembly is optionally available Type Code no Remarks MJ A6SPF0007 100 000 125 237 C 2000 MJ A6SPF0009 100 000 125 236 AD 100 The OPTION connector To connect external equipment to the OP TIO...

Page 47: ...ct the 5P connector to J51 on SPU Board 9 Replace the covers removed in step 1 10 Connect navaid and other equipment to radar 11 Turn on the radar and confirm that NAV data in properly received at the...

Page 48: ...tallation Setup 2 enable entry of initial settings and adjustment of the radar Procedure 1 Turn on the power while pressing and hold ing down the HM OFF key 2 Press the MENU key MAIN MENU Select item...

Page 49: ...H Press HM OFF to temporarily hide menu Press MENU for main menu Figure 5 18 Installation setup 2 menu 3 Select Align Heading and press the ENT key 4 Press the cursor pad to bisect the target se lecte...

Page 50: ...rsor pad at the 9 o clock or 3 o clock position to straighten the target 6 Press the ENT key 5 9 Closing the Installation Menus Press the MENU key and turn off the power Table 5 1 Voltage ratings refe...

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