Icom IC-2720H Instruction Manual

Also see for IC-2720: User reference guide Service manual

Contents

Icom IC-2720H Instruction Manual Manual pdf 90 page image

73MAINTENANCE12PROBLEM POSSIBLE CAUSE SOLUTION REF. Troubleshooting If your transceiver seems to be malfunctioning, please checkthe following points before sending it to a service center.Does not turn on.No sound comes from thespeaker.Sensitivity is low and onlystrong signals are audible.No contact possible withanother station.Repeater cannot be ac-cessed.Frequency cannot be set.Frequency cannot be setvia the microphone.• Power connector has a poor contact.• Polarity of the power connection is reversed.• Blown fuse.• Volume is too low.• The audio mute function is activated.• Squelch is set too high.• A selective call or squelch function is activatedsuch as pocket beep or tone squelch.• Antenna feedline or the antenna connector has apoor contact or is short circuited.• Squelch attenuator function is activated.• The other station is using tone squelch.• The transceiver is set to duplex.• Wrong offset frequency is programmed.• Wrong subaudible tone frequency is programmed.• The frequency lock function is activated.• Priority watch is paused on the watching frequency.• The frequency lock function is activated.• The microphone keypad lock function is activated.• Priority watch is paused on the watching fre-quency.• Check the connector pins.• Re-connect the power cable observing the properpolarity. Replace the fuse if damaged.• Check the cause, then replace the fuse.• Rotate [VOL] clockwise.• Push any switch or key to deactivate it.• Set the squelch level to the threshold.• Turn the appropriate function OFF.• Check, and if necessary, replace the feedline or sol-der the antenna connector again.• Set [SQL] between 10–12 o’clock position.• Turn the tone squelch function ON.• Set to simplex.• Correct the offset frequency.• Correct the subaudible tone frequency.• Turn the function OFF.• Push [LOW•PRIO] for 1 sec. to cancel the watch.• Turn the function OFF• Push [FUNC] then [SQLZ #(16KEY-L)] to deactivatethe microphone keypad lock function.• Push [LOW•PRIO] for 1 sec. to cancel the watch.—pgs. VI,74p. 74p. 16p. 21p. 16pgs. 52,53, 54p. VIIp. 17p. 54p. 23p. 27p. 25p. 15p. 47p. 15p. 15p. 47