Icom IC-7700 ■Troubleshooting, D Transceiver power, D Transmit and receive, 13 MAINTENANCE

13 MAINTENANCE■Troubleshooting

The following chart is designed to help you correct problems which are not equipment malfunctions.

If you are unable to locate the cause of a problem or solve it through the use of this chart, contact you nearest Icom Dealer or Service Center.

D Transceiver power

PROBLEM	POSSIBLE CAUSE	SOLUTION	REF.
Power does not come on	• Power cable is improperly connected.	• Re-connect the AC power cable correctly.	p. 2-5
when the [POWER] switch	• The internal power supply is turned OFF.	• Turn the internal power supply ON.	p. 3-2
is pushed.	• Circuit breaker is tripped.	• Check for the cause, then re-set the circuit	—
		breaker.

D Transmit and receive

	PROBLEM			POSSIBLE CAUSE	SOLUTION	REF.
No	sounds	from	the	• Volume level is too low.	• Rotate [AF] clockwise to obtain a suitable lis-	p. 3-9
speaker.					tening level.
				• The squelch is closed.	• Turn [SQL] to 10 o’clock position to open the	p. 3-9
					squelch.
				• The transceiver is in transmit.	• Push [TRANSMIT] to receive or check the	p. 3-12
					SEND line of an external unit, if connected.
Sensitivity is too low, and				• The antenna is not connected properly.	• Re-connect to the antenna connector.	—
only strong		signals	are	• The antenna for another band is selected.	• Select an antenna suitable for the operating	p. 10-2
audible.					frequency.
				• The antenna is not properly tuned.	• Push and hold [TUNER] for 1 sec. to manually	p. 10-6
					tune the antenna.
				• The attenuator is activated.	• Push [ATT] (MF4) several times to select “ATT	p. 5-9
					OFF.”
Received audio is unclear				• Wrong operating mode is selected.	• Select a suitable operating mode.	p. 3-8
or distorted.				• PBT function is activated.	• Push and hold [PBT-CLR] for 1 sec. to reset the	p. 5-12
					function.
				• Noise blanker is turned ON when receiving a	• Push [NB] to turn the noise blanker OFF.	p. 5-16
				strong signal.
				• Preamp is activated.	• Push [P.AMP] (MF3) once or twice to turn the	p. 5-9
					function OFF.
				• The noise reduction is activated and the [NR]	• Set the [NR] control for maximum readability.	p. 5-17
				control is too far clockwise.
The [ANT] switch does not				• The antenna switch has not been activated.	• Set the antenna switch in set mode to “Auto” or	p. 10-4
function					“Manual.”
Transmitting is impossible.				• The operating frequency is not inside a ham	• Set the frequency to be in a ham band.	p. 3-5
				band.
Output power is too low.				• [RF PWR] is set too far counterclockwise	• Rotate [RF PWR] clockwise.	p. 3-12
				• [DRIVE] is set too far counterclockwise	• Set [DRIVE] to a suitable position.	p. 3-13
				• [MIC] is set too far counterclockwise	• Set [MIC] to a suitable position.	p. 3-12
				• The antenna for another band is selected.	• Select an antenna suitable for the operating	p. 10-2
					frequency.
				• The antenna is not properly tuned.	• Push and hold [TUNER] for 1 sec. to manually	p. 10-6
					tune the antenna.
No	contact possible		with	• RIT or ∂TX function is activated.	• Push [RIT] or [∂TX] to turn the function OFF.	pgs. 5-10,
another station.						6-4
				• Split frequency function is activated.	• Push [SPLIT] to turn the function OFF.	p. 6-6
Transmit signal is unclear				• [MIC] is set too far clockwise	• Set [MIC] to a suitable position.	p. 3-12
or distorted.
Repeater cannot be				• Split frequency function is not activated.	• Push [SPLIT] to to turn the function ON	p. 6-6
accessed.				• Programmed subaudible tone frequency is	• Reset the frequency using set mode.	p. 4-33
				wrong.

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