Furuno 841 MARK-2 manual Installation Check List, Radar

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	J55 (NMEA)
SPU9180
TLL, RSD	J61
MODEL 841 M2

Navaid

Echosounder

Video plotter

7.	Connect the NMEA cable to the connector
	assy (03-1796/5P, supplied with radar) as
	shown the figure on next page.
8.	Connect the 5P connector to J51 on SPU
	Board.
9.	Replace the covers removed in step 1.
10. Connect navaid and other equipment to
	radar.

The position data from navaid can be used for the echosounder if a video plotter is not connected.

11. Turn on the radar and confirm that NAV

data in properly received at the radar and ex-

ternal equipment.

Procedure

1.Unfasten the nuts fixing the waterproof con- nector to remove the covers of the power and display unit.

2.Remove all connectors from SPU Board (SPU-9180).

3.Unfasten three screws to remove the board.

4.Remove JP3, R91 and R92 on the parts side of SPU Board.

5.3 Installation Check List

After completing the installation it is a good idea to check for proper installation. Follow the checklist below and tick boxes to show proper completion.

❒ Is the vent tube on the antenna housing on

the stern side?

❒ Are the four bolts for fixing the radome tight-

ened?

❒ Is the signal cable waterproofed at the ra-

dome base?

R93

R94

SPU-9180

Parts side

Remove JP3.

JP3 JP4

CR14

R90

R91

❒ Is the signal cable secured against a mast or

bulkhead?

❒ Is the cable gland or cable entry on the

deck fully waterproofed?

❒ Are the connections to the battery of

correct polarity?

❒ Are all the antenna and display units

R95	Q15
	Q15
						R91
						R91
Q16						R92	Remove R91 and R92.
						R92	Remove R91 and R92.

5.Add jumper wire between J55 pin #3(RXD-

H)and J61 pin #1(TXD-H).

6.Add a jumper wire between J55 pin #4(RXD-

C)and J61 pin #5(SHIELD).

Add the jumper wire between J61#5 and J55#4.

	JP3		JP4
	CR14
R93	R90		J55
R93	R91	J61
R94	R91				R69
	5


	Q15				C27
R95	Q15		4	3	R70
	R91		4	3	R70
	R91
Q16	R92
	R92
	1

Add the jumper wire between J61#1 and J55#3.

grounded?

❒ Are all connectors at the rear of the display

unit fastened securely?

CAUTION

If it is necessary to open the display unit, be sure the rear cover is fitted to the front chassis properly when closing the rear cover. When reassembling, first turn off the unit and then press the center of the rear cover to plug in the multipin connector on the rear cover.

35

Image 47

Contents Marine Radar B . N o . O M E 3 4 4 4 Safety Instructions Do not operate the equipment with wet hands Do not open the equipmentStay away from transmitting antenna Do not disassemble or modify the equipmentUse the correct fuse IiiTable of Contents Foreword FeaturesDisplay Unit SpecificationsAntenna Unit Transceiver Module contained in radomeInterface Nmea Complete Set Installation Materials CP03-15xxAccessories FP03-05900 Equipment ListOptional Equipment Model 841 MARK-2 ConfigurationPrinciple of Operation How radar works Control Description Operation675NM 220.9R 0.646NM 308.7R Display Indications and MarkersTurning the Radar On and Off 5NMSelecting the Range Adjusting LCD Backlighting and Display ToneAdjusting Control Panel Brilliance TransmittingSTC MAN Auto Adjusting GAIN, STC, A/C Rain and FTCGeneral procedure How to tune manually Tuning the ReceiverAdjusting A/C Rain Adjusting FTCMeasuring the Bearing Measuring the RangeSee the table on the next Menu OperationPress the Menu key to open the menu. The main menu appears Menu Function Menu description11 Display modes Selecting the Display ModeCU course-up Selecting the Presentation ModeWindow Display Course-up, you may select CU or WPT- UP, on the menuWPT-UP waypoint-up Guard AlarmSetting the guard zone Silencing the audible alarmSuppressing Radar Interference Canceling the guard zoneSelecting Pulselength Suppressing Noise InterferenceOff Centering the Display Navigation Data Display Echo TrailsTurning echo stretch on or off Setting up the nav data displayEcho Stretch magnifying long range echoes Press the Menu key Select Nav Data and press the ENT keyTurning on watchman Selecting Unit of Measurement for RangeSelecting Bearing Reference WatchmanDisplaying Navigation Data During Stand-by Canceling watchmanErasing the Heading Marker Deselecting RangesDisplaying Cursor Position, Range and Bearing to Cursor Visual Alarm IndicationsError Visual alarm Outputting Cursor Position to NavigatorSuper-refraction Interpreting the DisplayRadar Wave and Radar Horizon Target Properties and Radar Wave ReflectionMultiple echoes Bearing ResolutionRange Resolution False EchoesIndirect echoes Side-lobe echoesNautical Chart and Radar Picture Safety Information Maintenance & TroubleshootingPeriod Check point Remarks Preventative MaintenanceReplacing the Fuse But Then TroubleshootingSelf Test Self TestMounting Antenna Unit InstallationSiting, handling considerations Parallel with the fore and aft line Holes for antenna unitMounting considerations Display Unit InstallationDisplay unit is designed to be mounted on a tabletop Mounting procedureConnections Signal cable connectionHeading Sensor Connection To connect external equipment to the OP- Tion connectorFor E/S Navigation aid, video sounder connectionRadar Installation Check ListFollow the procedure below to obtain proper radar picture Initial Adjustment of PictureDisplaying the Installation Menus Sweep Timing Entering Initial SettingsRelative Bearing Alignment Press the Menu key and turn off the power Closing the Installation MenusPage Page Page Page Page Page