Icom IC-R75 Instruction Manual

Also see for IC-R75: Price list Instruction manual Instruction manual Service manual

Icom IC-R75 Instruction Manual Manual pdf 40 page image

■ Resetting the CPUResetting CLEARS all programmed contents inmemory channels and returns programmed valuesin set mode to their defaults.When first applying power or when the functionseems to be displaying erroneous information, resetthe CPU as follows:q Make sure receiver power is OFF.w While pushing [UP Y] and [Z DN], push [POWER]to turn power ON.• The internal CPU is reset.• The receiver displays its initial VFO frequencies whenresetting is complete.1136MAINTENANCE■ TroubleshootingThe following chart is designed to help you correctproblems which are equipment malfunctions.If you are not able to locate the cause of a problemor solve it through the use of this chart, contact yournearest Icom Dealer or Service Center.[POWER] [ZDN] [UPY]PROBLEM POSSIBLE CAUSE SOLUTION REF.POWER Power does not come onwhen the [POWER] switchis pushed.• DC power cable is improperly connected.• Fuse is blown.• Reconnect the DC power cable correctly.• Check for the cause, then replace the fuse witha spare one.(Fuses are installed in the DC power cableand the internal MAIN unit.)—p. 37RECEIVENo sound comes from thespeaker.• Volume level is too low.• The squelch is closed.• Rotate [AF] clockwise to obtain a suitablelistening level.• Rotate [RF/SQL] to 12 o’clock position to openthe squelch.p. 2p. 14Sensitivity is low. • The antenna is not connected properly.• The antenna for another band is selected.• The attenuator is activated.• Reconnect to the antenna connector.• Select an antenna suitable for the operatingfrequency.• Push [ATT] to turn the function OFF.—p. 16p. 16Receive audio is distorted. • The operating mode is not selected correctly.• PBT function is activated.• Noise blanker function is activated.• Preamp is activated.• The optional noise reduction is activated andthe [NR] level is set too high.• Select a suitable operating mode.• Set [TWIN PBT] to the center position.• Push [NB] to turn the function OFF.• Push [P.AMP] once or twice to turn the functionOFF.• Push [NR] to turn the function OFF.p. 14p. 15p. 15p. 16p. 20SCANProgrammed scan doesnot stop.• Squelch is open.• [RF/SQL] is assigned to RF gain control andsquelch is open.• Set [RF/SQL] to the threshold point.• Reset [RF/SQL] control assignment and set it tothe threshold point.p. 14pgs.14, 30Programmed scan doesnot start.• The same frequencies have been programmedin scan edge memory channels P1 and P2.• Program different frequencies in scan edgememory channels P1 and P2.p. 22Memory scan does notstart.• 2 or more memory channels have not beenprogrammed.• Program 2 or more memory channels. p. 22Select memory scan doesnot start.• 2 or more memory channels have not beendesignated as select channels.• Designate 2 or more memory channels as selectchannels for the scan.p. 26DISPLAY “F.AGC” flashes in thefunction display.• A scan or band scope function is activated viaan optional RS-R75 remote control software.• If these functions are not in use, push [AGC] todeactivate the function.—The displayed frequencydoes not change properly.• The dial lock function is activated.• The internal CPU has malfunctioned.• Push [LOCK] to deactivate the function.• Reset the CPU.p. 13Seebelow.