92TROUBLESHOOTING13PROBLEM POSSIBLE CAUSE SOLUTION REF.The transceiver doesnot turn ON.• Bad connection to the power source. • Check the connection to the transceiver andpower source.p. 82Little or no sound comesfrom the speaker.• Squelch level is set too high.• Volume level is set too low.• Speaker has been exposed to water.• Set the squelch to the threshold point.• Set the volume to a suitable level.• Remove the water with the AquaQuake func-tion.p. 15p. 15p. 18Transmitting is impossi-ble, or high power can-not be selected.• Some channels are restricted to low poweror receive only by regulations.• The output power is set to low.• Change channels.• Push [HI/LO] to select high power.pp. 11,12, 13p. 14Scan does not start. • Favorite channels are not entered. • Set the desired channels as Favorite chan-nels.p. 20No beep sounds. • Beep tones are turned OFF. • Turn ON the beep tones in the CONFIGURA-TION menu.p. 76Distress calls cannot betransmitted.• MMSI (DSC self ID) code is not entered. • Enter the MMSI (DSC self ID) code. p. 9Built-in GPS receiver isnot receiving valid posi-tion data.( For only IC-M423Gand IC-M424G.)• The built-in GPS antenna is covered by anobject that interrupts the GPS signals fromthe satellites.• Mount the transceiver in a place where noobjects interrupts the satellites signal.p. 85