Icom VHF MARINE TRANSCEIVER, IC-M502 Troubleshooting, Problem Possible Cause Solution

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10 TROUBLESHOOTING

PROBLEM	POSSIBLE CAUSE	SOLUTION	REF.
No power comes ON.	• Bad connection to the power supply.	• Check the connection to the transceiver.	p. 35

No sound comes from	• Squelch level is too deep.	• Set squelch to the threshold point.	p. 8
the speaker.	• Volume level is too low.	• Set [VOL] to a suitable level.	p. 8
	• Speaker has been exposed to water.	• Drain water from the speaker.	—
	• Internal speaker is turned OFF.	• Turn the internal speaker ON in set mode.	p. 32

Sensitivity is low.	• The attenuator is activated.	• Push [LO/DX] to turn the function OFF.	p. 8

Transmitting is impossi-	• Some channels are for low power or re-	• Change channels.	pgs.
ble, or high power can-	ceive only.		6, 41
not be selected.	• The output power is set to low.	• Push [HI/LO] to select high power.	p. 8

Scan does not start.	• “TAG” channel is not programmed.	• Set the desired channels as “TAG” chan-	p. 13
		nels.

No beep sounds.	• Beep tone is turned OFF.	• Turn the beep tone ON in set mode.	p. 32
	• The squelch is open.	• Set squelch to the threshold point.	p. 8

Receive signal cannot	• Optional voice scrambler is turned OFF.	• Turn the optional voice scrambler ON.	p. 10
be understood.	• Scramble code is not set correctly.	• Reset the scramble code.	p. 33

Distress call cannot be	• MMSI (DSC self ID) code is not pro-	• Program the MMSI (DSC self ID) code.	p. 14
transmitted.	grammed.

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Contents IM502 Case of Emergency Channel 16 is automatically selectedTable of Contents Page Operating Rules Radio license for boaters U.S.A. onlyShip Station License OPERATOR’S LicenseTransmit Power Switch HI/LO Panel DescriptionPanel description Channel Selector Channel1DSC/POSITION Switch DSC/ENTPOS Function display PTT Switch PTT Channel UP/DOWN Switches Y/ZSame as the HI/LO switch on the front panel. p MicrophoneBasic Operation Channel selectionChannel Channel 9 Call channelMicrophone lock function Weather channelsCanadian channels Push once CH/WXPush HI/LO to select the output power if necessary Receiving and transmittingPush LO/DX to turn the receive attenuator on or OFF if Necessary25W TAG äLEASURE Call channel programmingChannel names Set mode Scrambler code item Optional voice scrambler operationActivating the scrambler Programming scrambler codes Optional scrambler function on or OFFCall channel Description OperationDUALWATCH/TRI-WATCH Simulation Scan Operations Scan typesPriority Scan Normal ScanScan starts Setting tag channels Starting a scanClearing all tag channels in the selected channel group DSC Operation Mmsi code programmingPosition and time programming LATÊÊÊÊ LonêêêêêPosition indication InputÊtimeUTCÊÊ LATÊ3434N LON13534EDistress call DistressÊÊTX LATÊ3523N LON13535EGPSÊUTC1234 Distress Completed WaitÊforÊACKTransmitting DSC calls Transmitting individual callÊindvêack DSC/ENTTransmitting individual acknowledgement ˘INDVÊACKTransmitting all ships call ˘AllÊshipsPush DSC/ENT to transmit the all ships call All ships call has been transmittedPosêreq Transmitting position request callTransmitting position reply call Setting the distress information SelÊitem ÊRCVÊcalls ˘DTRSÊset ÊSet-upSelÊnature ÊUndesign ˘Explosion ÊFlooding Push Distress for 5 sec. to transmit the distress callDSC individual ID Programming address IDDeleting address ID NameReceiving a distress acknowledgement Receiving DSC callsReceiving a distress call Receiving a distress relay acknowledgement Receiving a distress relay callReceiving an all ships call Receiving an individual callReceiving a geographical area call Receiving a position reply callReceiving a position request call ÊtomDSC set mode Offset timeSet-up ÊAddÊID ÊDeleteÊID ˘OffsetÊtime OffsetÊtime 0000 1200Mmsi code check Set-up ÊDeleteÊID ÊOffsetÊtime ˘MMSIÊcheckCheck the 9-digit Mmsi DSC self ID code MMSIÊcheck 123456789Receive messages SelÊitem ˘RCVÊcalls ÊDTRSÊset ÊSet-upSelÊMessage ˘Distress ÊOther ToÊclear ThisÊdata NoÊDSC/ENT YesÊH/LIntercom Operation Intercom operationIntercom TalkSET Mode Set mode programmingSET Mode Construction Push 16Set mode items Scan modeScan resume timer Weather alertInternal speaker DSC watchBeep tone LCD contrast Attenuation levelScrambler code Scrambler typeConnections and Maintenance Supplied accessoriesFuse replacement CleaningConnections Microphone HangerOverhead Mounting Mounting on Dashboard Using the supplied mounting bracketMounting the transceiver Using the optional mounting bracket Attach the clamps on either side of the IC-M502Optional unit installation Dimensions Troubleshooting Problem Possible Cause Solution† Low power only Receive only Channel ListSpecifications and Options SpeciﬁcationsGeneral TransmitterOptions Power Switch PWR pgs PTT Switch PTT pgsHM-127 REMOTE-CONTROL Microphone Push and hold to transmit release to receiveSQUELCH/MONITOR/LOCK Switch Sqlmonil VOLUME/DIMMER Switch VoldimTransmit Power Switch H/L 0SCAN Switch SCNTAGpgs0PRIORITY Channel Indicator HM-127 supplied accessories Installation Installation is finished when it is completedMm 3⁄32˝ 24 to 27 d mm 15⁄16 to 11⁄16˝ Mm 29⁄32˝ Gasket Channel A., International and Canadian channels Call channelPush CH/WX to select regular channel Condition before selecting the Push Weather channel groupPush LO/DX to turn the RF Attenuator function on and OFF Push H/L to select the output power, if necessaryRF attenuator function Lock functions Display backlightingMonitor function Activating the lock functionActivating the scrambler Programming scramble codesPush Y/Z to select the desired channel To turn the scrambler func Tion OFF, repeat step wSetting tag channels Dualwatch/Tri- watch operationBeep toneBEEP Entering set modeTurn power OFF While pushing 169, turn power on Available characters Intercom operation Channel namesIntercom beep function Template Cut here149 57⁄˝ R11 Mm 3⁄32˝Kamiminami, Hirano-ku, Osaka 547-0003 Japan