Furuno IB-681 manual Antenna cable Position of R135 Length, CPU2 Board 16P0133

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	Antenna cable	Position of R135
	length	Position of R135
	length

	10 to 40 m	Marked position (default position)

	More than 40 m	Fully clockwise (max. output power)

4.Remove the CPU2 Board from the communication unit. See Figure 19 for location.

5.Replace the ROMs (I/O CPU and SYS CPU) on the CPU2 Board. See Figure 17 for location. Mount the CPU2 Board.

				CPU2 BOARD 16P0133
			U65
				U5		SYS CPU
				U5		SYS CPU
I/O CPU			U67		16501-05-110
I/O CPU			U67	DIP SW S1
16501-06-106
16501-06-106

U37 U8

U55

JP2

BT1

U56

C75

Figure 17 CPU2 Board

22

Image 32

Contents Page B . N o . O M E 5 6 0 9 Safety Instructions Safety Information for the OperatorSafety Information for the Installer Electrical Shock HazardTable of Contents Appendix Usage Tips Declaration of conformity to typeFeatures IntroductionInstallation Materials CP16-01601 Installation Materials CP16-01602Equipment List Complete SetOptional Equipment Installation Materials CP16-01603Installation Materials CP16-01605 System Configuration IB-181IB-281 IB-681Front panel OverviewControl Description Rear panel IB-681, rear viewSettings Switch Panel SettingsDIP switches Data rateSW2 Terminal interface OID/DID and IMN Settings Terminal Unit SettingsRegistering, Deleting Subscriber Number Registering subscriber numberDeleting subscriber number Confirming subscriber numberAutomatic HSD call OperationCalling Interval Manual callTone Name Frequency SW1 State Remarks Automatic call mode and receiving operationReceiving V.25bis Command, Indication Receiving and automatic data rate switchingCommand Name Description SW3 State RemarksCommand Description Indication DescriptionDirect call setup sequence Call SequenceAddress call setup sequence Address call setup sequenceManual call setup sequence Manual call setup sequenceAutomatic call clear sequence Call clear sequence from landManual call clear sequence Manual call clear sequenceMaintenance & Troubleshooting MaintenanceCleaning Resetting the circuit breakerTroubleshooting for the User ThenGeneral CallingInstallation Mounting procedureMounting Mounting locationWiring Wiring between HSD modem and routerModifying the RF Conv board in the communication unit RS-449 InterfaceAntenna cable Position of R135 Length CPU2 Board 16P0133RF Conv Board RF Conv Board CPU2 BoardR135 J10Mounting of connector assy Rear Panel Board Sub 9 pinJ11 Wiring between HSD modem and communication unitGround Circuit delay Propagation delayRouter setting for network connection Communication with other makes of Inmarsat-B terminalsNetwork configuration Syuchronous -asynchronous adapter Land Earth Station IOR Etilat IB-681 Page Page Page Index